How to book a flight without overpaying.

The big comparison sites all pull from broadly the same fare data, so in our tests they land within a few dollars of each other on most routes. The differences are minor. Skyscanner casts the widest net and catches budget carriers the others miss, which is why it's our favourite, but honestly any of them is fine. Google Flights has the clearest calendar and price graph for scanning flexible dates. Kayak and Momondo are owned by the same company and hand back almost identical results, so there's no need to check both.

The one we'd steer you away from is a reseller like Kiwi.com. It isn't a comparison site, it sells you the ticket itself, usually a stitched-together self-transfer, and if a connection breaks that's your problem. We keep it in the list only to make the point: stick to a real comparison site, then book direct with the airline. That's where the good, safe fares are.

None of the comparison sites sell you the ticket anyway. They find the flight and the price, then hand you to whoever's selling it. We search a couple of them, then book straight with the airline wherever the price is close (Tip 3 explains why that's worth a few dollars).

The biggest factor in what you pay isn't a trick, it's how flexible you are. Use the whole-month and cheapest-month views to spot the cheap days, and check nearby airports on both ends. Check nearby destinations too: we regularly see Bali fares drop by a few hundred dollars just by flying into Kuala Lumpur first and booking a separate AirAsia hop onward. A midweek departure usually beats Friday or Sunday.

Flexibility can also decide whether there's a direct flight at all. Not every airline flies every route every day, so a Monday-to-Friday trip might force a connection while Tuesday-to-Saturday has a nonstop on the exact same route. The quick way to see this without checking date by date: in Google Flights set the stops filter to Nonstop, then open the date grid. Any day with no direct greys out, so the whole month's nonstop pattern shows at a glance.

Online travel agencies (Trip.com, Gotogate, Kiwi, eDreams and the rest) often show a fare a few dollars under the airline. The catch is what happens when the airline changes your schedule, cancels, or you need a refund or a change: you can only deal with the agency, not the airline. Their support is often slower than dealing with the airline directly, because they've already been paid, and the airline will usually point you back to them.

When an OTA does make sense: a large price gap, or a mixed-airline itinerary no single airline sells. Otherwise pay the small premium, book direct, and keep the airline on the hook when it matters.

Layovers are usually cheaper, sometimes a lot. But don't just compare ticket prices: airport food, a possible overnight hotel, a transit visa, and the risk of a delay eating your connection all add to the real cost.

The bigger trap is the self-transfer. Book two separate tickets, or an OTA "virtual" connection stitched together from different airlines, and those airlines don't know about each other. Miss the second flight because the first ran late, and nobody owes you a thing. A single ticket with a protected connection means the airline rebooks you for free when they cause the misconnect. On a self-transfer with under about 90 minutes to change planes, don't.

That unbeatable price is almost always the most stripped-out fare bucket. Basic Economy, or a budget airline's base fare, typically means no carry-on beyond a small personal item, no seat selection, no changes, and last to board. Add a bag and a seat and it can easily cost more than the normal economy fare you scrolled straight past. Add the bag before you compare, then look at the real total.

This is the whole game: chase value, not the lowest number. A $520 fare with a bag and a protected connection beats a $470 self-transfer with neither. Compare the real total for the trip you'll actually take, not the teaser on the results page.

The same stripped-out trick exists up front. A "Business Light" fare (Emirates, Qatar and others sell one) gets you the lie-flat seat and the full baggage, but drops lounge access, lets you pick your seat only at check-in, and comes with change fees. Fine if all you want is the flat bed, worth knowing before you assume every business fare is the flexible one.

Airlines aren't interchangeable, and the gap compounds if you funnel your flying through one of them or its alliance (Star Alliance, Oneworld, SkyTeam). Miles add up toward free flights, seat selection, priority boarding and lounge access, and status earned on one alliance member is recognised across the others.

Signing up costs nothing and takes two minutes, so join before you fly even if you only fly once a year: the miles just sit in the account waiting. What isn't always worth it is paying more, or taking a worse routing, purely to chase status. Join everything, then let it break the tie when prices are close.

Return tickets aren't automatically cheaper. Price two one-way tickets on different airlines and they often come out lower, especially where budget carriers compete for the route, and they almost never cost more. You also get the flexibility to change one leg without torching the whole fare. The old warning that one-ways are punishingly expensive is mostly a US-legacy-carrier hangover now. The one big exception: legacy long-haul like the transatlantic, where a single return can still beat two singles, so check both rather than assuming.

See our test: we priced three trips as a return, then as two singles. Two one-ways won every time, by $45 on one route and loose change on another →

You don't have to leave from where you arrived. Fly into Bangkok and out of Singapore (an open-jaw) and skip a wasted backtracking flight. Google Flights and airline sites both do multi-city search. For a trip that hits several places, it's frequently cheaper than a simple return plus separate internal flights, and you see more of the region.

Airfares are filed market by market, in what's called the point of sale. The identical trip can be priced differently depending on which country's site and currency you buy it from, because of local competition, currency, and demand.

You don't touch your route or your dates. Keep Amsterdam→Bali exactly as it is, then re-price it with the search site set to another country and currency, usually the destination's, sometimes a third market. It takes 30 seconds and it's the same seats on the same planes. This is the selling market, not a VPN trick (see Tip 10), and your card's country can limit which points of sale will take payment.

Fares move on real supply and demand, not on your browser history. A VPN, incognito mode, clearing cookies, booking on a Tuesday or at midnight, hitting search one too many times: none of it changes the price. We've tested it, and so has everyone else. The cards below are the "hacks" that get shared the most and hold up the least.

The one bit of timing that does matter is how far ahead you book, not the day or the hour. Roughly one to three months out for short-haul, two to six for long-haul. Don't leave it to the last minute, and don't book a year ahead either. Set a price alert and buy when it dips into a range you're happy with.

Two advanced tricks do sometimes work, with a catch. Hidden-city ticketing (booking A→C via B and getting off at B because it's cheaper) can work, but you can't check a bag, it only works one-way, and airlines can penalise your frequent-flyer account or cancel your return if you no-show a leg. Error fares (a genuinely mispriced ticket) are real and occasionally spectacular, but the airline can cancel them, so don't book non-refundable hotels around one until it's ticketed. Fly once a year? Skip both and stick to the tips above.