Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
WayAway - Find cheap flights and get cashback on all your travel deals
KAYAK - KAYAK is a travel search engine that searches hundreds of other travel sites at once. Our helpful tools & features find you the information you need to make the right decisions on flights, hotels, rental cars and vacation packages.
Wanderlog - Collaborative travel planner with combined itinerary and map
Momondo - Find cheap flights with Momondo.
Passporter - Passporter is the tool that helps travelers in all phases of a trip through a community that helps you travel better by making your trip an easy, simple and orderly experience.