Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
KDE Itinerary - Digital travel assistant with a priority on protecting your privacy
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.
Onward Ticket - Onward Ticket is a web and mobile platform that enables individuals to package travel into single itineraries.
Momondo - Find cheap flights with Momondo.
JetRadar - Compare flights from hundreds of airlines & travel agencies