1. HotelsCombined.com

hotelscombined.com

2. Trivago

trivago.com

3. Booking

booking.com

4. Priceline

priceline.com

5. Hotels

hotels.com

6. Expedia

expedia.com

7. Agoda

agoda.com

8. Hostelworld

hostelworld.com

9. Orbitz

orbitz.com

10. Hotel Tonight

hoteltonight.com