Best Flight-Search Engines 2026: Google Flights vs Skyscanner vs Kayak vs Kiwi

Search the same route on four engines in the same hour — say Heathrow to JFK in October — and you'll get four different prices, routinely £60–£120 apart. Google Flights says £478, Skyscanner £441, Kayak £495, Kiwi £402 with a catch. Same planes. Each engine indexes a different slice of the fare market, so "which search engine is cheapest" has no single answer. "Which should I use for this trip" does:

• You know where but not exactly when: Google Flights
• You know your budget but not your destination: Skyscanner
• Multi-city, or picky about layovers: Kayak
• You want the absolute floor price and can stomach some risk: Kiwi

That's the short version. The longer one is where the money is.

Start with Google Flights — but treat it as a map, not a till

Google Flights is the right first search almost every time. Fastest interface, best date grid, and a price-history graph that tells you whether today's fare is high or low for the route. That graph is worth more than the prices themselves: if it says you're £90 above typical, you wait. This one habit saves more than any engine-hopping.

Two blind spots. It excludes carriers that won't share data — Southwest in the US, and at times chunks of Ryanair inventory — so on routes they dominate, the cheapest flight simply isn't on the page. And it doesn't sell tickets, so the fare can shift once the airline's own site loads.

Skyscanner finds trips you didn't know you wanted

Skyscanner's "Everywhere" search is still the best tool in the industry for one specific question: "I have £150 and a free weekend — where can I go?" It ranks the planet by price from your home airport and covers European and Asian low-cost carriers better than anyone. If that mindset appeals, our guide to letting the price pick your destination is built around it.

The trap is the reseller row. The cheapest result is often an online travel agency you've never heard of, and those fares are sometimes stale, sometimes exclude bags, and always painful when a flight cancels. Our working rule: book through an OTA only when it beats the airline's own price by more than about £25. Below that, booking direct pays for itself the first time anything goes wrong.

Kayak and Kiwi are specialist tools

Kayak's edge isn't price, it's control — filters for layover length, specific airports, even aircraft type, plus "Hacker Fares" that stitch two one-ways into a cheaper round trip. For a simple return it rarely beats the other two. For a fiddly multi-stop itinerary it's the best workbench there is.

Kiwi is the interesting one. It combines tickets from airlines that don't cooperate — a Ryanair hop feeding a long-haul leg — and builds routings nothing else shows. Sometimes that's genuinely the cheapest fare on the internet. But these are separate tickets: if the first flight is late, no airline owes you a rebooking, and Kiwi's paid guarantee has fine print worth reading twice. Self-transfer is worth it when all three hold: hand luggage only, three-plus hours between flights, and a saving bigger than what a last-minute replacement leg would cost. Miss one and the cheap ticket is the expensive one.

Engine	Use it for	The catch
Google Flights	Date grids, price history	Missing some LCCs (e.g. Southwest)
Skyscanner	"Everywhere", LCC coverage	Obscure OTA resellers
Kayak	Filters, multi-stop, Hacker Fares	Cluttered results, rarely cheapest
Kiwi	Absolute floor price	Self-transfer risk is yours

Two things people still get wrong

Incognito mode doesn't lower fares. Prices move because airline revenue systems reprice inventory constantly, not because a cookie saw you look twice. When clearing cookies "works", you've just caught a reprice that would have happened anyway.

And whatever engine you use, check the airline's own site before paying. It matches the metasearch price surprisingly often, the service is better, and refunds don't route through a middleman.

The blind spot all four share

Every engine shows the price at the moment you search. None of them watches the route afterwards — and the best fares often live for hours, not days. We got tired of refreshing four tabs, which is why we built Flyozo: it watches your routes around the clock and pings you when a fare drops well below its normal range. Use the engines above to pick the route and learn what normal costs. Let the alert catch the abnormal.