How to find cheaper flights: what actually works

Airfare pricing looks random from the outside, but it is not. Airlines sell a fixed number of seats in a series of price buckets, and the fare you see is whichever bucket is still open when you search. Almost everything you can do to pay less comes down to reaching a cheaper bucket, or accepting a trade-off the airline is willing to discount for.

Here is what actually helps.

Be flexible with dates before anything else

Date flexibility is the single biggest lever most travellers have. The same route, same airline and same cabin can sit in a completely different price bucket a day either side of your first choice.

If your trip has any give in it, check the days around your ideal departure before you settle. Mid-week departures are often cheaper than Friday and Sunday ones simply because fewer people want them — not because of any secret rule about which day to buy.

Check nearby airports at both ends

Large cities often have more than one airport, and a second one can be served by different airlines with different pricing. Before you commit, work out:

• what the alternative airport costs you in ground transport
• how much extra time it adds, especially on arrival at night
• whether the saving survives both

Sometimes it is a clear win. Sometimes the taxi eats the difference. The point is to check rather than assume.

Understand what a cheap fare leaves out

The lowest number on a results page is rarely the full cost. Basic and light fares typically restrict or charge extra for things fuller fares include:

• checked baggage
• seat selection
• changes and cancellations
• sometimes even cabin bag size

A fare that looks cheaper can end up costing more once you add a bag. Compare the total you will actually pay, not the headline. Our baggage guide covers how to work that out before you book.

Consider one stop instead of non-stop

Connecting itineraries are frequently cheaper than non-stop ones, because the airline is compensating you for the inconvenience. Whether that is a good deal depends on the trip: a single stop on a long-haul route can be genuinely comfortable, while a tight connection at the end of a working day is not.

If you go this route, give yourself real connection time. We wrote about how much layover you actually need.

Search the whole trip, not two one-ways, then compare

Return fares are sometimes priced better than two separate one-ways, and sometimes worse. There is no universal rule, which is exactly why it is worth checking both. It takes a minute.

Book the trip you will actually take

The most expensive flight is the one you have to change. A slightly higher fare that allows changes can be cheaper than a restricted one plus a change fee plus a fare difference — particularly if your plans are not settled.

Ask yourself honestly how likely the dates are to move, and price the flexible option before you rule it out.

Ignore the myths

A few things you will read often, which do not hold up:

• Clearing cookies does not lower fares. Prices move because seats sell and buckets close, not because a site recognises you.
• There is no single magic day to book. The best time varies by route, season and demand.
• The lowest fare of the year is not predictable. Anyone claiming otherwise is guessing.

Set the search up properly

Finally, small things that genuinely help:

• Search with your real passenger count from the start. Fares are quoted per person against remaining seats, and adding travellers later can change the result.
• Fill in the correct cabin. A cheap economy fare is irrelevant if you need extra legroom.
• Look at the fare rules before paying, not after.

None of this is glamorous, but together it is the difference between paying what the route costs and paying what the first result happened to say. Search your route with a couple of date options and compare properly.