Travel has become a increasingly popular global activity with no less than 940 million international tourist arrivals last year and a International tourism receipts total of around US$919 billion.  The following article is about the top 100 most popular travel sites in 2011 as per the number of unique visitors.  It includes some of the most popular travel booking agencies such as Expedia and SkyScanner, user generated portals with thousands of customer reviews such as TripAdvisor, as well as top hotel sites including Agoda and other well known hotel brands such as the Accorhotels and Intercontinental group.  Other top candidates on our list are websites mostly known for the quality of their travel content and unique insights on the world’s top destinations such as Lonely Planet as well as some of the most popular global airlines.  We divided the candidates into various topics including top booking websites,  hotel websites, travel content websites and top airline websites.  The complete top 100 travel sites list is displayed at the bottom of the article.

Topics

Travel website categories

Although there are many different travel ways we could of categorize the top 100 winners, we divided our list into the following key topics: top booking sites such as Expedia, Priceline and Kayak, top hotel specific sites such as Hilton and Accorhotels,  top travel content sites such as Wikitravel and Lonely Planet, airline sites with the most popular carrier brands and finally other category where the rest of the travel related sites can be found including money conversion, cruises and timeshares bookings.

Top Booking

Top Hotels

Travel Content

Top Airlines

Other

Booking
TripAdvisor
Expedia
Priceline
Kayak
Yahoo! Travel
Orbitz
Travelocity
Hotwire
Travelzoo
Venere
Agoda
Hostelworld
Cheap Tickets
Late Rooms
SkyScanner
Cheap Flights
Hostelbookers
Hotel.de
HRS
Expedia.ca
X-Rates
OneTravel
Wotif
BedandBreakfast
Thomas Cook
Ebookers

Marriott
Hilton
Hyatt Hotels
Intercontinental Accorhotels
Best Western
Choice Hotels
Holiday Inn Express
Sheraton Hotels
Ibis Hotels

Lonely Planet
Virtual Tourist
Wikitravel
Time Out.com
Travel Pod
AOL Travel
Thorn Tree
Frommers.com
Fodors.com
TravelBlog
Travel and Leisure Magazine
Telegraph Travel
Travellerspoint

Southwest
Delta Air Lines
Ryanair
AA
EasyJet
United Airlines
Continental Airlines
British Airways
Lufthansa
Virgin Atlantic
Emirates
Aero Berlin
Japan Airlines
US Airways
KLM Airlines
LanChile
Air Canada
Qantas Airways
Alaska Airlines
Alitalia
Iberia
Aeroflot
Turkish Airlines
TAM Airlines
AirTran Airways
Qatar Airways
Saudi Arabian
Cathay Pacific
Frontier Airlines
Cebu Pacific Air
Jet Airways India
Aer Lingus
Swiss
Air France
AeroMexico
WestJet

XE.com
UCC
CouchSurfing
Vacation Rentals Consular Affairs
HomeAway
X-Rates.com
Carnival Cruise
RCI
Vegas.com
Vacations To Go
Owners Direct
Visahq.com

Top Booking websites

The following are the top Booking websites which include large holding companies such as Priceline (owner of Booking and Agoda) or Expedia (owner of TripAdvisor and Hotwire ) offering the full range of travel services, hotel specific sites such as Agoda, hostels sites, User Generated sites such as TripAdvisor as well as Flights specific sites such as the excellent SkyScanner service.

All

Hotels

Flights

User generated

Hostels

Expedia
Kayak
Yahoo! Travel
Orbitz
Travelocity
Hotwire
Cheap Tickets
Expedia.ca
OneTravel.com
BedandBreakfast
Thomas Cook
Ebookers

Booking
Priceline
Venere
Agoda
Late Rooms
Hotel.de
HRS
Wotif

SkyScanner
Cheap Flights

TripAdvisor
Travelzoo

Hostelworld.com
Hostelbookers

Booking.com

Booking.com is the web most popular accommodation reservation service attracting more than 30 million unique visitors each month from both leisure and business markets worldwide.  It offers various accommodations types from small independent to five star luxury hotels, with over 135,000 properties across 101 countries.  Along with Agoda it is part of Priceline.com.

TripAdvisor

TripAdvisor.com is the biggest travel site when it comes to customers reviews and opinions, making it the perfect place to gather travel information. The users provide most of the content including reviews, star ratings and travel forums. It is part of the TripAdvisor Media Group, operated by Expedia Inc.

Check out the latest travel offers on TripAdvisor.

TripAdvisor - Best Travel Websites

Expedia.com

Expedia is one of the biggest web based travel booking agency offering a variety of services include airline tickets, hotel reservations, car rentals, cruises and vacation package deals.  It is based in the US with localized sites for 20 countries including Canada, Japan, India, Singapore,  Australia New Zealand, UK  and many other European countries.  Expedia was first started by Microsoft and is now a publicly traded company.

Priceline

Priceline.com is a public traded company that facilitates the provision of travel services by its suppliers to its customers to helps users obtain discount rates for travel-related items such as airline tickets and hotel stays. Priceline was the brainchild of digital entrepreneur Jay S. Walker and later purchased by the Hong Kong company Cheung Kong Holdings.

Kayak

Kayak  is a famous metasearch engine which looks for flights, hotels and rental car rates from hundreds of other websites.  Indeed Kayak aggregates results from various top travel sites, allowing its visitors to compare options and redirects them to one of these sites for reservation.

Yahoo! Travel

Yahoo travel is an online travel site offering airline tickets, hotels, cars, cruises and vacation pack reservations.

Orbitz

Orbitz provides customers with an easy way to research, plan and book a broad range of travel products.  It facilitates no less than 1.5 million flight searches and one million hotel searches per day and give users access to some of the lowest fares.

Travelocity

Travelocity is perhaps the second biggest online travel agency offering a variety of travel services, including fare finder, hotel and car rental information.  It operates a full-service business agency with main offices in the USA but also in Canada, Germany, France, the Scandinavian countries, Mexico, India and the United Kingdom. Travelocity sister sites include lastminute.com in Europe and Zuji in Asia as well as other brands such as World Choice Travel, a travel affiliate marketing program, IgoUgo, an online travel community and travel-planning resource, and AllHotels, an online hotel reservation site.

Hotwire

Hotwire is a discount travel website that offers low prices on airfare, hotel, rental cars and vacation packages by selling off unsold travel inventory at discounted prices. It is headquartered in San Francisco and is part of the Expedia group along with hotels.com, ClassicVacations.com and TripAdvisor.com.

Travelzoo

Travelzoo is a global Internet media company with no less than 23 million subscribers around the world.  It publishes handpicked sales and special offers from over 2000 travel, entertainment and local companies.  Travelzoo is one of the largest and most trusted publisher of travel, entertainment and local deals with each deal published tested for accuracy, availability and overall ease of the booking process.

Venere.com

Venere is an online hotel, B&B and apartment reservation service.

Agoda

Agoda.com  is one of the best online hotel reservation services offering more than 150 thousands of accommodations, a real time booking system and the lowest rates guaranteedAgoda has a worldwide reach and is one of the market leader in the Asia Pacific Region with offices in Singapore, Bangkok, Hong Kong, Kuala Lumpur, Phuket, Bali, Sydney, Tokyo, Seoul, Beijing, Shanghai and Manila.

Check out the latest Agoda hotel deals, best prices guaranteed.

test - Best Travel Websites

Hostelworld.com

Hostelworld.com is an online booking site offering over 17,000 hostels worldwide and over 1 million customer reviews.

Cheap Tickets

Cheaptickets.com offers a variety of travel services including airline tickets, cruise tickets, auto rentals and  hotel reservations.

Late Rooms

LateRooms.com is a hotel reservations website providing accommodation throughout the UK, Europe and the rest of the world.  It offers a wide choice of accommodations with more than 44,000 choices including independent and chain hotels, and has a daily unique visitors average of 231,758.

SkyScanner

Skyscanner is perhaps the best flight reservation tool on the web, comparing hundred of airlines across various dates, as well as having various handy tools such as the interactive flight map.  It offers some of the best flights deals worldwide but especially within Europe.
Check out the latest Skyscanner flight deals.

SkyScanner - Best Travel Websites

Cheap Flights

Cheapflights is a British based site, enabling users to browse worldwide flight destinations and find suitable cheap flights from all major destinations.

Hostelbookers.com

Hostelbookers.com is one of the biggest online worldwide hostels booking service.

Hotel.de

hotel.de is a Germany based hotel reservation website.

HRS Hotel Reservation Service

HRS Hotel Reservation as it name entails is one of the biggest worldwide hotel booking system.

Expedia.ca

Expedia.ca is the Canadian version of one of the biggest web based travel website offering a variety of travel services available both in French and English.

OneTravel.com

Onetravel is a travel website offering Flights, Hotels and other Packages deals to top destinations throughout the world.

Wotif.com

Wotif is an Australian reservation service offering worldwide hotels.  The key advantage of their site is that it provides information for the next 3 months,  with often hotels lowering their rates as the date gets closer.

BedandBreakfast.com

Bedandbreakfast is perhaps the biggest site of its kind offering thousands of bed and breakfasts, inns and homestays worldwide.

Thomas Cook Retail Ltd

Thomascook is an International accredited travel agency offering an online booking service for flights, hotels and other package deals.

Ebookers.com

Ebookers is a well known travel reservation center offering various vacation packages, hotels, air fares and car hire services.

Top Hotels websites

The following are the top Hotel websites which include some of the world’s biggest and most famous accommodation networks.

Name

Group

Country

Hotels

Marriott

Marriott International

USA

3,150 lodging properties

Hilton

Hilton Hotels & Resorts

USA

540 Hilton branded hotels

Hyatt Hotels

Hyatt Hotels Corporation

USA

735 Hyatt Hotels

Intercontinental

InterContinental Hotels Group

UK

4,500 hotels under InterContinental Hotels Group

Accorhotels

Accor group

France

4,000 hotels under the Accor group

Best Western

Best Western International

USA

4,000 Best Western hotels

Choice Hotels

Choice Hotels International

USA

6,000 locations under the Choice Hotels International group

Holiday Inn Express Hotels

InterContinental Hotels Group

UK

1,500 Holiday Inn Express hotels

Sheraton Hotels

Starwood Hotels & Resorts Worldwide’s

USA

992 properties under the Starwood group

Ibis Hotels

Accor group

France

831 locations

Marriott International

Marriott International is a worldwide operator and franchisor of hotels and related lodging facilities with more than 3,150 lodging properties within the US and in some 68 other countries and territories.  The company was initially founded by J. Willard Marriott and is now run by son J.W. (Bill) Marriott.  It has a variety of brands including but not limited to Marriott Hotels & Resorts, JW Marriott Hotels & Resorts, Renaissance Hotels, Ritz-Carlton, Autograph Collection Hotels & Resorts, Courtyard by Marriott, Marriott Executive Apartments and The Residences at the Ritz-Carlton.

Hilton

Hilton Hotels & Resorts is a well known international chain of full-service hotels and resorts founded by Conrad Hilton and currently owned by Hilton Worldwide.  It has more than 540 Hilton branded hotels in 76 countries across the world. The company places marketing emphasis on business travel, but also owns and operates a number of resorts and leisure-oriented hotels in popular vacation destinations around the world.

Check out the latest Hilton hotel deals.

Hilton - Best Travel Websites

Hyatt Hotels and Resorts

Hyatt Hotels Corporation is an international operator of hotels with the Hyatt Center in downtown Chicago the company headquarters.  The hotel chain offers business travellers a variety of worldwide luxury hotels to cater all of their needs.

Intercontinental Hotels Group

InterContinental Hotels Group is a global hotels company headquartered in the United Kingdom and considered the largest hotels company in the world measured by number of rooms.  It has over 4,500 hotels in over 100 countries, with a total of no less than 646,000.  It has a variety of brands including InterContinental, Holiday Inn, Crowne Plaza and Park Royal.

Check out the latest Intercontinental hotel deals.

Intercontinental Hotels Group - Best Travel Websites

Accorhotels

The Accor group is one of the world’s biggest hotel chain offering over 4,000 hotels in 90 countries.  It has something for every taste and budget across all the different world’s regions from the Americas to Australia and New Zealand passing by Europe, Africa and Asia.  It has a variety of well known brands from the high end luxury hotels such as the known Sofitel to more budget accommodations such as Europe’s low cost leaders the Etap Hotel and Formule1.  Some of the great deals they currently offer include the possibility to win ten Free World Tour, a special gift on Accor’s 10th Anniversary or the possibility to stay 4 nights and get 1 night Free with Sofitel this summer at over 80 destinations worldwide.

Check out the latest Accor hotel deals.

Accorhotels - Best Travel Websites

Best Western

Best Western International is one of the world’s largest hotel chain with over 4,000 hotels, half in North America and the others set across nearly 80 countries.  It is known for offering free Wi-Fi access hotspots in its hotels.  Best Western International also owns Best Western Premier, an upscale hotel brand for some of its properties located in Europe and Asia.  Bestwestern.com website offers great deals, discounts, directory of locations and an online reservations service.

Choice Hotels International

Choice Hotels International is a famous hospitality holding corporation offering various brands including Ascend Collection, Cambria Suites, Clarion, Comfort Inn, Comfort Suites, Econo Lodge, Mainstay Suites, Quality Inn, Rodeway Inn, Sleep Inn NS Suburban Extended Stay Hotel.

Holiday Inn Express Hotels

Holiday Inn Express is one of the world’s most famous mid-priced hotel chain part of the larger InterContinental Hotels Group.  It offers a selection of 1,500 hotels worldwide at very competitive prices and is ideal for business travelers and short-term stays.  The official site offers the worldwide locations and a reservations system.

Check out the latest Holiday Inn Express Hotel deals.

Holiday Inn Express Hotels - Best Travel Websites

Sheraton Hotels & Resorts

Sheraton Hotels and Resorts is Starwood Hotels & Resorts Worldwide’s largest and second oldest brand (Westin being the oldest).   The Sheraton brand offer luxurious properties in North and South America, Europe, Asia, Oceania and the Middle East.

Ibis Hotels

The Ibis brand is a network of 2, 3 and 4 star hotels, currently in 831 locations in 42 countries across North and South America, Europe, Asia and Oceania.   It is known as the worldwide economy hotel offering consistent quality accommodation and services.  It provides excellent value for money with all rooms fully-equipped and the hotel offering  a 24/7 reception.  The Ibis hotels are generally close to city centres, airports or rail stations and offer some of the best rates. It is part of the larger Accor group.
Check out the latest Ibis Hotel deals.

Top Travel Content websites

The following is the list of the top Content websites divided within the content type, wiki or the community type where the main focus is on user generated content in the form of post, pictures, ratings or comments.

Content

Wiki

Community

Lonely Planet
Time Out
AOL Travel
Frommers.com
Fodors.com
T and L Magazine
Telegraph Travel

Wikitravel

Virtual Tourist
Travel Pod
Thorn Tree
TravelBlog
Travellerspoint

Lonely Planet

Lonelyplanet.com is the most popular travel content site offering a variety of travel news and advices, detailed maps as well as popular message boards and health information.

The Virtual Tourist

The Virtual Tourist is an interactive site aimed at sharing travel knowledge using a variety of tools including a chat, forums, travelogues and photos.

Wikitravel

Wikitravel is perhaps the biggest free travel project on the web offering a complete and reliable world-wide travel guide.  It has literally thousands of up-to-date articles on almost all possible world destinations.

Time Out.com

Time Out is a global travel website offering weekly entertainment listings from over 25 of the world top cities.

AOL Travel

AOL Travel offers cheap airline ticket information, flight information, reservations and lodging to a various of world destinations.

TravelPod

TravelPod is one of the most popular travel blog on the web, enabling users to share their travels experiences and stories.  It has currently a community of over 66,000 users and offers various travel resources and services.

Thorn Tree

Thorn Tree is the famous Lonely Planet’s bulletin board for travellers to exchange travel information and various tips.

Frommers.com

Frommers offers quality travel information on various destinations around the globe including activities, feature articles and guidebooks.

Fodors.com

Fodors.com is the online version of the world’s largest publisher of English language travel and tourism information and travel guidebooks.

TravelBlog

TravelBlog is a travel community site where visitors can share their own experiences with travelogues and photos from around the world.

Travel and Leisure Magazine

Travel and Leisure is an online magazine offering travel reporting  as wells as access to destination facts and searchable archives.

Telegraph.co.uk: Travel

The travel section of the famous British newspaper offers a variety of travel news, information and advices.

Travellerspoint

Travellerspoint  is a worldwide travel community offering free travel tools and quality information to help travellers before and during their trips.

Top Airline websites

Americas

Europe

Asia

Australia

Southwest
Delta Air Lines
American Airlines
United Airlines
Continental
US Airways
LanChile
Air Canada
Alaska Airlines
TAM Airlines
AirTran Airways
Frontier Airlines

Ryanair
EasyJet
British Airways
Lufthansa
Aero Berlin
Virgin Atlantic
KLM Airlines
Alitalia
Iberia
Aeroflot
Turkish Airlines
Aer Lingus
Swiss
Air France
AeroMexico
WestJet

Emirates
Japan Airlines
Qatar Airways
Saudi Arabian 
Cathay Pacific
Cebu Pacific Air
Jet Airways India

Qantas Airways

Southwest

Southwest is one of the biggest airline in the US.  Their sites offers various company information, flight schedules and reservations.

Delta Air Lines

Delta.com is an is an American airline site offering flight reservations, schedules and itineraries.

Ryanair

Ryanair is an Irish discount carrier offering a reservations system, flight schedules and company profile on their site.

American Airlines

The American Airlines site offers flight schedules, fares, special offers and the company’s frequent travel program.

EasyJet.com

Easyjet.com is a low cost travel airline offering cheap flights, hotels, car hire and parking .

United Airlines

United Air Lines is a major American airline and one of the world’s largest with 48,000 employees and 359 aircraft.  It is a founding member of the Star Alliance, the largest airline alliance in the world and offers connections to over 1,000 destinations in over 170 countries worldwide.

Continental Airlines

Continental Airlines is a major American airline based in Houston, Texas, offering flight schedules, reservations, vacation specials and corporate information on their site.

British Airways

British Airways (BA) is the largest airline in the UK based on fleet size, international flights and international destinations.   Their site offers online bookings, flight schedules and frequent flyer offers.

Lufthansa

Lufthansa is the flag carrier of Germany and the largest airline in Europe in terms of overall passengers carried. Their site includes downloadable timetables, photo gallery and online reservations.

Virgin Atlantic Airlines

Virgin Atlantic Airways Limited is a British airline owned by Sir Richard Branson’s Virgin Group (51%) and Singapore Airlines (49%) headquartered in England near London Gatwick Airport.  It operates between the United Kingdom and North America, the Caribbean, Africa, the Middle East, Asia, and Australia from its bases at London Gatwick Airport and London Heathrow Airport, using a mixed fleet of Airbus and Boeing wide-body aircraft. Their site includes online booking, frequent flyer information and special offers.

Emirates

Emirates is the Dubai based quality international airline which flies to over 80 destinations on 5 continents.

Aero Berlin

Aero Berlin is the German airline offering scheduled flights in Europe.

Japan Airlines

Japan Airlines website offers flights schedule, destinations, reservation, frequent flyer program , seat availability and general information.

US Airways

US Airways offers affordable airline tickets and last minute airfare to destinations all over the worlds.

KLM Royal Dutch Airlines

KLM Royal Dutch Airlines is the national airline of the Netherlands and is part of Air France-KLM. It operates worldwide scheduled passenger and cargo services to more than 90 destinations.  KLM.com offers online booking, special offers, flight schedules, airline fares and frequent travel program.

LanChile

LanChile offers flight schedules, online ticket purchase, specials, destinations and frequent flyer program.

Air Canada

Aircanada.com include flight schedules, reservations, ground services, air cargo and vacation information.

Qantas Airways

Qantas Airways is a domestic and international airline based in Australia.  Their site includes schedules and flight information.

Alaska Airlines

Alaska Airlines  or alaskaair.com include flight information, schedules, reservations city guide, vacation packages and frequent flyer programs.

Alitalia

Alitalia is an Italian airline providing flight information, scheduling, online booking and various travel planner tools.

Iberia

Iberia  is the Spanish airline offering flight information and company history in English and Spanish.

Aeroflot

Aeroflot  is Russia’s most important International Airline with information on flight schedules, travel office, available on their site.

Turkish Airlines

Turkish Airlines site you can buy flight ticket, check in, make reservation, examine flight timetable and read arrivals.

TAM Airlines

TAM Airlines is the Brazilian carrier providing reservations, flight schedules and special Internet offers.

AirTran Airways

AirTran Airways is the American discount airline serving the eastern and central United States. Their website includes flight schedules and reservation.

Saudi Arabian Airlines

Saudi Arabian Airlines is the country’s national airline and their site offers general information, flight schedules and frequent flyer programs.

Cathay Pacific Airways

Cathay Pacific Airways  is a Hong Kong based airline which include reservations, frequent flyer programs, flight schedules and employment on their site.

Frontier Airlines

Frontier Airlines is Denver based national airline with company information, employment opportunities, and travel schedule on their site.

Cebu Pacific Air

Cebu Pacific Air is the Philippines’ leading domestic carrier and low fare leader.

Jet Airways (India) Ltd.

Jet Airways is India’s  based airline operating both international and internal flights.

Aer Lingus

Aer Lingus is Ireland’s national airline. Their website offers flight schedules, booking, company information and travel guides.

Qatar Airways

Qatar Airways is the international airline of Qatar. Their website  have information on in-flight services, cargo and holiday destinations deals.

Swiss

Swiss is Switzerland’s national airline and their site contains flight schedules, time table and special offers.

Air France

Air France is the country’s national airline offering travel information, services, cargo, corporate, industries on their site.

AeroMexico

AeroMexico offers flight information, schedules and online reservations.

WestJet

WestJet is the Canadian low cost carrier with their website offering online booking, flight schedules, special fares and corporate inform.

Allegiant Air

Allegiant Air is US domestic low cost carrier with hubs in Las Vegas, Phoenix, LA and various Florida airports.

Top other travel websites

The last category shows all the remaining travel website that didn’t appear in the previous categories.  Those include money converter sites, alternative accommodations portals , cruise lines as well as a visa site and the only city specific travel website on the top 100 list, Vegas.com, which offers all the needed information to fully enjoy sin city.

Money

Alternative

Passport & Visa

Cruise

City

XE.com
UCC
X-Rates.com

CouchSurfing
Vacation Rentals
HomeAway
Owners Direct

Consular Affairs
Visahq.com

Carnival Cruise
RCI
Vacations To Go

Vegas.com

XE.com

Xe.com is the world’s most popular currency site offering free currency rates and other useful services such as money transfer.

Universal Currency Converter

UCC or Universal Currency Converter is part of XE.com and is the most popular currency converter with live foreign exchange rates.

CouchSurfing

CouchSurfing  is a unique travel site offering free accommodations around the world with the use of profile listing, discussion groups and other services.

Vacation Rentals by Owner

Vacation Rentals by Owner  or vrbo.com  is one of the top vacation rental sites with over 75,000 listings and offering the largest number of any vacation rentals.

Bureau of Consular Affairs, U.S. State Department

Bureau of Consular Affairs is a US state site offering travel warnings, international adoption, passport and visa service and problems for American citizens.

HomeAway Vacation Rentals Worldwide

HomeAway Vacation Rentals Worldwide or homeaway.com  offers over 65,000 vacation rentals all over the world from regular homes to luxury villas passing by beach houses and ski chalets.

X-Rates.com

X-rates.com is a popular currency exchange website offering various tools such as time plotted charts, conversion tables, calculator and historic lookups.

Carnival Cruise Lines

Carnival Cruise Lines is a well known mass-market cruise line with sailings to the Caribbean, Mexico, Europe and Alaska.

Royal Caribbean International (RCI)

Royal Caribbean International or RCI is a mass-market cruise line known for innovative large ships with features such as rock-climbing walls.

Vegas.com

Vegas.com is the official Vegas site and the city’s largest online booker for entertainment, hotels, restaurants, tours, golf and other services.  It is the only city specific travel website on our list.

Vacations To Go

Vacations To Go  is a cruise agency based in Houston which offers cruise search, ships, ratings and port information.

Owners Direct

Owners Direct is a British site offering holiday villas directly from the owners.

Visahq.com

Visahq.com is the complete database of visa requirements for all nations around the world.

RCI

RCI or Resort Condominiums International is one of the larger brokers of timeshare trades with over 4,700 affiliated resorts in over 100 countries and a membership base of approximately 3.6 million members worldwide.

Top 100 travel websites list

The following is the top 100 travel websites 2011 list in order of importance:

  1. Booking.com
  2. TripAdvisor
  3. XE.com
  4. Expedia.com
  5. Universal Currency Converter
  6. Priceline
  7. Southwest.com
  8. Kayak.com
  9. Yahoo! Travel
  10. Orbitz
  11. Delta Air Lines
  12. Ryanair
  13. Travelocity
  14. American Airlines
  15. Marriott International
  16. Hilton
  17. EasyJet.com
  18. Lonely Planet
  19. Hotwire
  20. Travelzoo
  21. Venere.com
  22. CouchSurfing
  23. United Airlines
  24. Continental Airlines
  25. Agoda
  26. British Airways
  27. Lufthansa
  28. Vacation Rentals by Owner
  29. The Virtual Tourist
  30. Bureau of Consular Affairs, U.S. State Department
  31. Wikitravel
  32. HomeAway Vacation Rentals Worldwide
  33. Virgin Atlantic Airlines
  34. Emirates
  35. Aero Berlin
  36. Japan Airlines
  37. Hostelworld.com
  38. Hyatt Hotels and Resorts
  39. Cheap Tickets
  40. Intercontinental Hotels Group
  41. US Airways
  42. KLM Royal Dutch Airlines
  43. Late Rooms
  44. Time Out.com
  45. SkyScanner
  46. Accorhotels
  47. Cheap Flights
  48. Travel Pod
  49. AOL Travel
  50. Hostelbookers.com
  51. Thorn Tree
  52. LanChile
  53. Air Canada
  54. Hotel.de
  55. HRS Hotel Reservation Service
  56. Qantas Airways
  57. Expedia.ca
  58. X-Rates.com
  59. Frommers.com
  60. Alaska Airlines
  61. Fodors.com
  62. Alitalia
  63. Iberia
  64. Aeroflot
  65. Best Western
  66. Turkish Airlines
  67. TAM Airlines
  68. AirTran Airways
  69. OneTravel.com
  70. Qatar Airways
  71. Wotif.com
  72. TravelBlog
  73. Saudi Arabian Airlines
  74. Carnival Cruise Lines
  75. Cathay Pacific Airways
  76. Choice Hotels International
  77. Frontier Airlines
  78. Cebu Pacific Air
  79. Travel and Leisure Magazine
  80. Jet Airways (India) Ltd.
  81. Aer Lingus
  82. Holiday Inn Express Hotels
  83. Royal Caribbean International (RCI)
  84. BedandBreakfast.com
  85. Swiss
  86. Sheraton Hotels & Resorts
  87. Air France
  88. Thomas Cook Retail Ltd
  89. Telegraph.co.uk: Travel
  90. Vegas.com
  91. Vacations To Go
  92. Ibis Hotels
  93. AeroMexico
  94. WestJet
  95. Owners Direct
  96. Ebookers.com
  97. Visahq.com
  98. Travellerspoint
  99. RCI
  100. Allegiant Air