For most European destinations, the cheapest time to book flights is 6–10 weeks before you fly. For long-haul, it is 3–5 months ahead. January and February are the cheapest months to actually fly anywhere from the UK. July, August, and the last ten days of December are the most expensive. The full picture depends on your destination and how flexible you are on dates — and that is what this guide covers, month by month.
| Destination | Cheapest to fly | Book ahead |
|---|---|---|
| Canaries | January, February | 6–10 weeks |
| Med summer | May, early June, Sep | 8–12 weeks |
| Caribbean | January, February | 3–5 months |
| Indian Ocean | May, October | 3–5 months |
| USA / Canada | Jan, Feb, March | 2–4 months |
| Ski Alps | January (non-peak) | 3–4 months |
| City breaks | Oct, Nov, March | 2–6 weeks |
European summer — when does cheap actually start?
The Mediterranean summer — Spain, Greece, Portugal, Turkey, Italy — accounts for the majority of UK short-haul travel, and pricing here follows a fairly predictable pattern once you know how budget airlines structure their fares.
Prices for July and August flights are almost always lowest when booked 8–12 weeks out. Book before that window and you pay the early-release price, which airlines set high because early bookers are willing to pay for the certainty of a confirmed trip. Book closer to departure on a popular summer route and you pay the panic price — the fare that appears when seats become scarce.
The cheapest months to fly to Mediterranean destinations are May, early June, and September. Temperatures across the Mediterranean are excellent in these months — mid-20s to low 30s in most places — crowds are noticeably lower, and return fares are regularly £50–£120 cheaper than peak August. If you have children and school holidays are not a constraint, flying in May or September is one of the simplest ways to cut the cost of a European holiday.
For the Canaries — Tenerife, Lanzarote, Fuerteventura, Gran Canaria — the dynamics differ slightly. These islands draw year-round UK visitors, so the summer spike is less dramatic than on purely seasonal Mediterranean routes. January and February are the cheapest months to fly, as UK demand drops sharply after the Christmas period. A return from Manchester or Gatwick in February can be £40–70 cheaper than the equivalent route in August.
On departure day and time: easyJet and Ryanair price by demand, not just proximity to departure. A Thursday morning flight from Bristol will often price very differently to a Friday evening flight from Gatwick on the same route. Always check multiple departure days before assuming the first fare you see is the cheapest. Our guide to the cheapest day to book flights covers this in detail.
Long-haul — the rules are different
Long-haul pricing works on a different timescale. Airlines release inventory 9–12 months ahead of departure, and the cheapest fares typically appear in two windows: the initial release, when airlines are trying to stimulate early demand, and a secondary dip around 3–4 months before departure when unsold seats start getting discounted.
Caribbean destinations — Barbados, Jamaica, Antigua, the Dominican Republic — are cheapest to fly to in January and February. This feels counterintuitive because it is still the high season for Caribbean weather, but UK demand falls sharply after Christmas and airlines respond by cutting fares. Book Caribbean routes 3–5 months in advance. The worst time to buy is October and November, when demand for the Christmas travel period pushes prices up quickly.
Indian Ocean destinations — Maldives, Mauritius, Sri Lanka, Zanzibar — are cheapest to fly to in May and October, though the weather picture is more complicated. Sri Lanka and parts of east Africa can be wet in these months. Always check the specific destination’s weather pattern before treating these as straightforward cheap windows. Our guide to how to get cheap flights from the UK covers long-haul booking strategies in more detail.
USA destinations — New York, Florida, Los Angeles, California — are cheapest to fly to in January, February, and March. After Christmas, the transatlantic market is quiet, and carriers including Virgin Atlantic, British Airways, and American Airlines reduce fares to fill seats. Book 2–4 months in advance. The most expensive windows are US Thanksgiving week (late November) and the American summer school holidays in July and August — though because US dates do not align with UK school holidays, some transatlantic routes remain reasonably priced in the UK peak weeks of late July and August.
Ski season flights — the January exception
Ski flights to Geneva, Innsbruck, Salzburg, Chambéry, and Turin tend to catch people out. Fares look manageable when you check them months out, but then rise steeply as the popular dates approach.
Christmas-week and New Year skiing produce some of the most expensive short-haul fares of the year. If you are booking flights for Christmas skiing, do it 4–5 months in advance. February half-term is similarly expensive — and the problem is compounded because Scottish schools and English schools often have different half-term dates, creating two consecutive expensive weeks rather than one.
January is the exception. Once Christmas and New Year are over, demand for ski flights drops fast. Fares for the January non-peak window — typically the second and third weeks of January — can be genuinely cheap, often 20–30% below December equivalents. Book these flights 3–4 months in advance. If you ski regularly and have the flexibility to go in January, this is consistently the best-value ski flying window of the year.
Month by month — when to fly and when to book
This table covers the full calendar year for UK flyers. “Best to fly” refers to where demand and fares are favourable. “Best to book” refers to the forward planning opportunity for future trips.
| Month | Best to fly now | Best to book | Watch out |
|---|---|---|---|
| January | Caribbean, USA Cheap month | Summer European | Nothing major |
| February | Canaries, Dubai Cheap month | Summer Med | Half-term week Avoid peak |
| March | City breaks | Summer and autumn | Easter if early |
| April | Post-Easter deals | Summer / autumn | Easter week Avoid peak |
| May | Med shoulder season Good value | August (now urgent) | Bank holidays |
| June | Early Med, Canaries | Christmas and ski | Late June |
| July | Nothing cheap Peak month | Christmas, next Feb | Everywhere expensive |
| August | Nothing cheap Peak month | Ski (Feb half-term) | Everything |
| September | Med shoulder season Good value | Summer next year | Nothing major |
| October | City breaks | Jan, Caribbean | Half-term week Avoid peak |
| November | Long-haul, Dubai Good value | Jan / Caribbean | Christmas fares rising |
| December | Early Dec only | Next summer, spring | Dec 20–Jan 2 Avoid peak |
The booking window — what the data actually shows
For UK short-haul routes, the research is consistent: booking 6–10 weeks before departure is the lowest-risk sweet spot. This is true for easyJet, Ryanair, Jet2, Wizz Air, and Vueling routes across European summer destinations.
Earlier is not always cheaper. Airlines often price early-release seats at a premium because planning-ahead bookers are willing to pay for certainty. The fare you see 6 months out can genuinely be higher than the same seat 10 weeks before departure. For budget airlines in particular, the mid-window sweet spot is real and consistently supported by pricing data.
Later is a gamble. Budget airlines do occasionally drop prices in the final 2–3 weeks on routes with spare capacity. But on popular summer routes — Canaries in August, the Greek islands in late July, Alicante over a bank holiday weekend — this almost never happens. Whether flights get cheaper last minute depends heavily on route popularity and the time of year.
For full-service carriers — British Airways, Lufthansa, KLM — look out for January and September sales. BA in particular runs structured World Traveller sale events in these months, sometimes offering long-haul economy fares at prices that are meaningfully below standard. Setting a Google Flights price alert in September for the following year’s travel is one of the most reliable ways to catch a genuinely low long-haul fare.
How to track prices without wasting hours
The practical toolkit for UK flyers:
- Google Flights lets you set price alerts for specific routes and sends an email when the fare changes. The “cheapest month” grid view is also useful if you have flexibility on dates.
- Skyscanner shows the cheapest fare per day across a whole month in its calendar view. Set your origin, destination, and click “Whole month” to see exactly which dates are cheapest.
- Sign up for easyJet Inspire and Ryanair deal alerts. Both run flash sales — typically 48–72 hours — that can be 20–40% below the standard fare. You need to be ready to book quickly, but the savings are real.
- British Airways email subscribers often get access to January sale fares before they go public. Worth subscribing if you are a regular long-haul traveller.
The most important thing is to know your target price before you start. Open Google Flights, look at how the fare for your route has moved over the past 90 days, and set a price alert. If you know what normal looks like, you will recognise a genuine low when one appears.
For the full toolkit of strategies — including how to use Google Flights price calendars, when to book direct versus through comparison sites, and how airline sales are structured — read our guide on how to get cheap flights from the UK.
Frequently asked questions
When is the cheapest month to book flights from the UK?
January is generally the best month. Airlines discount heavily after the Christmas rush, and this is when you will find the lowest fares for spring and summer routes. Budget airlines like easyJet and Ryanair run January sales that can be 20–40% below standard prices. If you miss January, September is the second-best booking window, particularly for locking in fares for the following summer.
Are flights cheaper in January?
Yes, for two reasons. January is a cheap month to both book and fly. Booking-wise, airlines discount after Christmas to stimulate demand. Flying-wise, it is the lowest-demand month of the year for UK holiday travel, so fares stay low even as departure approaches. Canaries routes in January are particularly cheap — demand from UK travellers falls sharply after the Christmas period, and airlines respond accordingly.
How far in advance should I book a flight from the UK?
For European short-haul, book 6–10 weeks before departure for the best balance of availability and price. For long-haul routes — Caribbean, USA, Indian Ocean — book 3–5 months ahead. For Christmas travel and school half-term dates (February, Easter, late October), book as early as possible. Fares for these periods rise consistently the closer you get, and rarely come back down.
When are flights most expensive in the UK?
The five most expensive windows of the year, in rough order: the last two weeks of July and all of August (school summer holidays); Christmas Eve to 2 January; the February half-term week; the Easter school holidays (typically two weeks in late March or April); and the late October half-term week. Flying in the weeks immediately before or after each of these windows is almost always significantly cheaper.
Do flights get cheaper last minute?
Occasionally, but not reliably enough to count on as a strategy. Budget airlines do discount unsold seats in the final few weeks, but only on quieter routes and off-peak dates. On popular summer routes — Majorca, Ibiza, Santorini, Tenerife in peak season — last-minute fares are almost always more expensive than booking 6–10 weeks ahead. Our guide on whether flights get cheaper last minute covers the full picture with route-by-route context.
