The biggest driver of flight prices is timing. Book in the right window for your route, stay flexible on dates, and use the tools designed to show you where demand is lowest, and you can pay considerably less than the person sitting next to you. This guide covers ten strategies that actually move the needle, based on how airline pricing works rather than how most people assume it does.
These aren’t tricks. They’re the mechanics of airline revenue management applied to your advantage.
Quick reference: when to book by flight type
Before the detail, here is the short version. The booking window that gives you the best balance of availability and price varies significantly by route type.
| Route type | Best window | Cheapest days |
|---|---|---|
| Short-haul EU | 6–10 weeks | Tue, Wed |
| Long haul | 2–5 months | Tue, Wed, Sat |
| Domestic UK | 4–8 weeks | Tue, Wed, Thu |
| Packages | 10–14 weeks | Any midweek |
1. Book at the right time
The sweet spot for European short-haul is six to ten weeks before departure. Beyond that window, prices trend upward as airlines fill cheaper fare classes. Inside three weeks, the jump is usually sharp.
The pattern is consistent across data from Skyscanner, Kayak, and Google Flights: fares for European routes peak in the final ten days before departure and are lowest in the six-to-ten-week window. The exact timing shifts slightly by route and season, but the direction doesn’t.
For long-haul to the USA, Southeast Asia, or the Caribbean, the window extends to two to five months. These routes have more seats and longer booking horizons, so demand builds more slowly. Booking four months out for a transatlantic flight is reasonable; booking four months out for a Ryanair flight to Malaga will just give you more time to watch the price drop slightly and then rise again.
For domestic UK flights, aim for four to eight weeks ahead. The demand curve is steeper because the routes are short and the capacity is lower.
More detail on the day-by-day mechanics: Cheapest day to book flights.
2. Set fare alerts before you search
Set a fare alert before you start actively searching, not after you’ve already seen prices. Once you’ve looked up a route, you’ve established a mental anchor for what the price “should” be. A fare alert set before that point gives you an objective baseline.
Both Google Flights and Skyscanner offer free alerts. Google Flights emails you when prices change from the level recorded when you set the alert. Skyscanner shows a “price alert” toggle on any search results page.
The main value isn’t catching a dramatic drop. It’s knowing whether a price you’re looking at is high, low, or typical for that route. Without that context, it’s hard to tell whether to book now or wait.
3. Be flexible on your departure dates
Moving your departure by one or two days can reduce prices by 15-30% on many routes. This is one of the highest-return actions available, and it costs nothing except a small amount of flexibility.
Tuesdays and Wednesdays consistently show lower average fares than Fridays and Sundays on popular routes. The Friday evening and Sunday evening peaks are driven by business travellers and leisure travellers returning home, both of which push demand (and therefore price) upward.
The calendar view in Google Flights is the fastest way to see this. Search for a route with flexible dates selected, and the calendar displays the cheapest fare for each day of the month. The pattern is usually visible immediately.
This applies to return dates too. If you can come back on a Tuesday instead of a Sunday, you may save as much on the return leg as the outbound.
Related: Cheapest day to book flights: what the data says.
4. Use Google Flights as your starting point
Google Flights is the most useful tool for understanding the price landscape before you commit to anything. It pulls fares from most major airlines and shows several things that other aggregators don’t display as clearly.
The calendar view highlights the cheapest dates in green. The price graph shows how fares on your chosen route have moved over recent weeks and how they project forward. The “Explore” feature lets you search for the cheapest destinations from your airport across a date range, which is useful if you have full flexibility.
One important caveat: Ryanair does not share its inventory with Google Flights or most other aggregators. You won’t see Ryanair’s fares on a Google Flights search. The same applies to some easyJet routes. Use Google Flights to understand the broader market and then check budget carriers separately.
5. Compare departure airports
If you can reach more than one airport, check fares from each before deciding. The difference on the same route, departing from different London airports for example, can be £50-100 per person.
London travellers have five options: Heathrow, Gatwick, Stansted, Luton, and Southend. Manchester, Leeds Bradford, and Liverpool are all within an hour of large parts of the north of England. Glasgow and Edinburgh serve different route networks and often have quite different fares for overlapping destinations.
The calculation isn’t just about the ticket price. Add the cost and time of getting to the airport. An extra hour’s travel to Stansted may be worthwhile for a £40 saving per person; less so for £10. But it’s worth running the numbers rather than defaulting to the nearest airport out of habit.
Google Flights lets you add multiple departure airports to a single search, which makes the comparison straightforward.
6. Understand how airline pricing actually works
Airline pricing is demand-based, not simply time-based. The misconception that prices always rise as the departure date approaches is close to true on average, but it misses the mechanics.
Airlines divide their seats into fare classes, typically labelled Y, B, H, K, M, Q, and so on down to the cheapest. When the cheapest class sells out, the next class opens, at a higher price. This happens based on demand, not a calendar. A flight that isn’t selling well three weeks out may still have cheaper fare classes available. A popular summer route might exhaust its cheapest classes four months ahead.
The practical implication: checking the same route multiple times across different dates and days of the week often reveals price differences that reflect demand patterns, not just booking timing. A Tuesday departure on a low-demand week in October may have cheaper seats available closer to departure than a Sunday in August booked months ahead.
This is also why checking the price on a different device or in an incognito browser is worth doing. Some aggregators adjust displayed prices based on your search history.
7. Know the most expensive times to fly
School holidays are the single biggest price driver for UK family travellers. Summer half-term, the six-week summer break, October half-term, Easter, and the Christmas-New Year period all see sharp increases on popular routes. The February half-term spike is often underestimated: short notice, school-tied demand, and limited capacity combine to push prices up sharply.
If you can fly outside these windows, you will pay significantly less. Shoulder seasons, April-May and September-October, offer the best combination of lower prices, manageable temperatures, and less crowded resorts. January and November are the cheapest months overall, though the choice of sun destinations narrows.
| Period | Typical uplift | What to do |
|---|---|---|
| Jul–Aug | +40–80% Most expensive | Book 4+ months ahead |
| Christmas | +50–100% Most expensive | Book 6+ months ahead |
| Easter | +25–50% Expensive | Book 8–10 weeks ahead |
| Shoulder | At baseline Best value | Standard 6–10 week window |
| Off-peak | −10–20% Cheapest | More flexibility on timing |
If you have no choice but to travel during school holidays, book as far ahead as possible. Waiting is almost never rewarded.
8. For budget airlines, book direct
Ryanair, easyJet, and Jet2 are cheapest on their own websites. This is not a preference, it is how their pricing works. Third-party booking sites add service fees on top of the base fare, and the lowest fare classes often don’t appear on aggregators at all.
The correct workflow: use a comparison tool (Google Flights, Skyscanner) to identify which airline has the best route and approximate price. Then go directly to that airline’s website to complete the purchase. You’ll often find the price is identical or lower, and you avoid booking fees that can add £10-20 per ticket.
For network carriers like British Airways, Lufthansa, or Air France, aggregators are more useful because the fare distribution is broader. But for Ryanair and easyJet specifically, the direct website is the right place to buy.
One more thing: if you’re buying Ryanair tickets, always check whether you need Priority boarding to get your bag in the overhead locker. The cheapest Ryanair fare only includes a small under-seat bag. The difference between the base fare and Priority can be £10-20 each way. Ryanair hand luggage rules explained.
9. Watch for airline sales
Most major UK carriers run predictable seasonal sales, and knowing the pattern lets you plan around them.
Ryanair runs flash sales regularly throughout the year, often announced on a Tuesday or Wednesday for travel in the following few months. The discounts are real, though headline fares represent a small number of seats on a small number of routes.
easyJet typically runs two major sales per year: one in January-February and one in October-November. Outside these windows, fares fluctuate but don’t follow a reliable pattern.
Jet2 runs seat sales several times a year, often with short booking windows and specific travel periods. British Airways runs a Winter sale in January and a Summer sale, typically in May or June.
Signing up to airline email lists is the simplest way to get advance notice. For Ryanair, following their social accounts also works. The sales are usually announced 24-48 hours before they go live.
Flight Tribe covers airline sales as they happen: see the latest flight deals.
10. Last-minute flights: when it works and when it doesn’t
The idea that flights get cheaper last minute is mostly a myth for UK travellers with a specific destination in mind. On popular routes and peak dates, prices almost always rise as the departure date approaches. Airlines know that people who need to get to Barcelona next Friday will pay more than someone booking two months out.
The exception is genuinely unsold capacity on low-demand routes. A midweek flight to a secondary European city in January may still have cheap seats available a week before departure. But this requires real flexibility: you can’t plan for it, and you can’t rely on it for holidays that need accommodation booked in advance.
If you’re travelling somewhere popular in peak season, last-minute is not a strategy. It’s a gamble that almost always costs more.
More on this: Do flights get cheaper last minute? What the evidence says. And for the easyJet-specific picture: Do easyJet flights get cheaper closer to the date?
Frequently asked questions about cheap flights from the UK
What is the cheapest time to book flights in the UK?
For European short-haul routes, the optimal window is six to ten weeks before departure. For long-haul (USA, Southeast Asia, Caribbean), book two to five months ahead. Inside three weeks, prices rise sharply on most routes, as airlines fill remaining seats with higher fare classes.
Do flights get cheaper closer to the date?
Rarely. On popular routes and dates, prices almost always rise as departure approaches. Genuine last-minute drops happen on low-demand routes when airlines have unsold capacity they need to clear. For most UK travellers booking a specific destination, waiting is usually more expensive, not less.
Is Tuesday or Wednesday the cheapest day to fly?
Tuesdays and Wednesdays consistently show lower average fares than Fridays and Sundays on popular routes. The difference is typically 10-20% but varies by route and season. Midweek departures are worth checking as part of any price comparison, though the pattern doesn’t apply universally.
What is the best website to find cheap flights?
Google Flights is the best starting point for comparing dates and tracking price changes. Skyscanner is useful for broader route searches, including some smaller carriers. Always check Ryanair, easyJet, and Jet2 directly, as their lowest fares don’t always appear in full on aggregators, and buying direct avoids third-party booking fees.
How do I get notified when flight prices drop?
Google Flights and Skyscanner both offer free fare alerts. Set an alert for your specific route and travel dates before you start actively comparing prices. Google Flights emails you when the price changes from the level recorded when you set the alert, which lets you move quickly when a drop occurs.
