When to book flights for the best price

There is no single best day, week or number of months ahead to book a flight. Fares change constantly with demand, how full the plane is and what competing airlines charge. The most reliable approach is to start watching early, know what a good price looks like for your route, and book when the fare reaches that level. Very late bookings are often more expensive, so it is risky to leave things to the final weeks.

The rest of this guide explains why timing advice is so inconsistent, what general patterns are worth knowing, and how to turn that into a simple plan.

Why there is no perfect booking date

Airlines sell seats in price levels. As seats at a lower level sell out, the next seat costs more. Revenue systems also adjust prices up or down based on how bookings compare with what the airline expected. That means the price for the same flight can rise, fall and rise again over the months before departure.

Because every route, airline and season behaves differently, any rule that names a precise number of days in advance is at best an average across many very different trips. It might be close for one route and wrong for yours.

General patterns worth knowing

These are broad tendencies, not guarantees. Treat them as a starting point.

• Last-minute fares are often high. In the final weeks before departure, airlines tend to sell remaining seats to travellers who must fly, such as business travellers, and prices often reflect that. Last-minute bargains do happen, but they are hard to count on.
• Very early is not always cheapest. When a flight first goes on sale, airlines may hold back their lowest fares or price cautiously. Booking the moment a schedule opens does not guarantee the best deal.
• Peak dates need more lead time. School holidays, major festivals and popular long weekends tend to fill up early. For these, it usually pays to start watching and be ready to book sooner.
• Off-peak travel gives more room. Quieter seasons and less popular days of the week often have more seats at lower levels, so there is less pressure to book early.
• Sales and new routes can create dips. Airline sales, competition on a route or a new carrier can push prices down for a while.

You will see claims that a particular weekday is the cheapest day to buy. The evidence for these rules is weak and they change over time. The day you fly tends to matter more than the day you book.

A practical plan

Instead of trying to guess the perfect moment, use a simple routine.

1. Start early. As soon as you know roughly where and when you want to go, start watching the route. For peak dates, start earlier.
2. Learn the normal price range. Run a few searches over several days. Note what a typical fare is and what a clearly good fare looks like.
3. Pick a target price. Choose a price you would be happy to pay. It should be realistic, a bit below what you usually see, not a fantasy fare. Our guide on setting a realistic target price covers this in detail.
4. Add flexibility if you can. Shifting your dates by a day or two, or accepting one stop, often opens up cheaper options. See how flexible dates help you find cheaper flights.
5. Book when it hits. When the fare reaches your target, act reasonably quickly. Good fares can disappear as seats sell.
6. Have a fallback date. Decide in advance the point at which you will book even if your target was not reached, so you are not caught by late price rises.

Things that matter more than timing

Timing is only one part of the price. Several choices often make a bigger difference:

• Which airport you use. Nearby alternative airports can have very different fares.
• Number of stops. Direct flights are convenient but often cost more than options with a connection.
• Cabin. Prices between cabins can vary a lot, and the gap is not constant.
• Total cost. A low fare can become expensive once you add bags, seat selection or other extras. Compare what you will actually pay.
• Rules of the ticket. A slightly higher fare with free changes can be worth it if your plans may shift.

Watch out for price changes when you book

Prices you see on search and comparison sites are often recently seen prices, not live ones. When you click through to book, the airline or travel agency shows the current price, which can be higher or lower. This is normal and is explained in why the price you see can change. Always check the final price, baggage rules and fare conditions on the booking site before paying.

How to set a Trigger for it

Trigger does the watching for you, so you do not have to search every day.

1. Go to flights and enter your route, one-way or return, dates, cabin and number of passengers.
2. Choose your date flexibility, from exact dates up to three days either side, and the maximum number of stops you will accept.
3. Set your target price, the fare you would happily book at.
4. Trigger re-checks the route regularly. Checks happen more often as your departure date gets closer, and more often when the price is close to your target.
5. When the price is at or below your target, Trigger emails you straight away with a link to book on a trusted partner site, where you will see the live price.

Trigger is free, and you can run up to 10 alerts at once. Each alert ends automatically on the departure date. To learn more, read how it works or how flight price alerts work.