Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
FAIRTIQ - FAIRTIQ is a cross-platform app and website that enables you to find cheap tickets for destinations throughout Europe.
JetRadar - Compare flights from hundreds of airlines & travel agencies
Opodo - Opodo is a website and cross-platform mobile app that enables you to find cheap flight deals and save money in the process.
Kiwi.com - Find and book the best low-cost flights all around the world
Wanderu - Wanderu is the simplest way to book bus and train travel. We search hundreds of carriers across North America & Europe and never charge any extra booking fees!