Hipmunk, Skyscanner, Google Flights, Flapper, PriceSpy, Hotwire, OntheFly, Kiwi.com, Travelocity, WhichAirline.com, Momondo, Priceline.com, Flightics, Travelpayouts, Top10.com, Matrix (airfare search), Expedia, Alternative Airlines, Skiplagged, FareFirst, AllTheRooms, PanFlights, TripTrav, StudentUniverse, jetLookup.com, Adioso, CheapOair, CNET Shopping, tripwolf, Plane Finder, Blimm, Sygic Travel, VaccationTravel, trivago, Orbitz, TicketLens, Cheap Flights Booking, ScoreTrip, Cleartrip, Owegoo, iTravel2000, museuly, Tripchemy, coachfairer.com, Ski Deal Comparison, Fly Nimbus, Tripzzle!, CheapFlightsFares, The Travel Professor, Flyzilla, Travelindicator, HotelsCombined, Taj Travel, Travel wiinkz, Flight Grabr, EventBlocks, PaperFlies, Tripfixed, Blubyn, Flight Deals Hound, Bargain Travel, Triporia.com, TravelStart, Jetto, Flightlist, Leave A Trace, Cruise Deals, DirectHotels.com, FlyGRN, DiscountFlights.com, CheapAir.com, CheapTickets, Ecosia Travel, CruiseSheet are some alternatives to KAYAK.