is an OTA like many others; you book directly on the site (as you would on Expedia) rather than being linked off to a different site (as you would on Kayak or Momondo). But what sets it apart is its search engine, which lets you find cheap itineraries for multi-destination trips. You enter the starting and ending places of your journey as well as the cities where you want to stop along the way, including how many nights you want to spend in each place. Hit “find routes,” and the site will put together an itinerary that mixes and matches airlines and routes for the lowest possible price. (For example, I was quoted a route involving four flights—New York City to Rome to Moscow to Tokyo and back to New York—for a measly $1,031 round-trip.) You can filter your results to weed out routes with multiple layovers or flights that don’t include checked baggage., We tested 15 sites on 32 itineraries, trying both last-minute flights (leaving in a week) and APEX fares (booked three months out). We covered major gateways (NYC to LAX, LAX to Hong Kong, NYC to Paris) and secondary ones (Philly to Tampa, Chicago to Rome, Miami to Rio)., Our Top 10 Best Flight Comparison Sites in 2025: Kayak - Best flight comparison site overall; Google Flights - Best for discovering value trips; Momondo - Best for finding the cheapest flights; Skyscanner - Best for finding the cheapest flights quickly; Expedia - Best for booking bundle deals; Airfarewatchdog - Best for expert-picked travel deals.