Google Flights - Find cheap flights in seconds, explore destinations on a map, and sign up for fare alerts on Google Flights.
Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
FlightList - Find cheap, one-way flights within a departure date range ✈️
AnyGo - If you've ever wondered the cost differences of flying vs driving to any destination in the US, like from New York City to Atlanta, AnyGo allows you to compare prices side by side, which makes planning your trip easier.
DropUnited - Chrome extension removes United from your flight search
Loopit - Loopit is a streamlined travel idea searching, planning, and sharing platform.