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Quick Answer
- Booking window: ~1–3 months out for short-haul/Europe, ~3–6 months for long-haul; earlier for Christmas and summer peaks.
- Cheapest days to fly: midweek and Saturday beat Friday/Sunday by roughly 10–15%.
- The day you buy barely matters: how far ahead you book and which day you fly matter far more.
- Budget airlines win on the base fare, not always the total, a checked bag can add €19–€60.
- Set a fare alert and use a flexible-date calendar instead of refreshing the same route hoping for a drop.
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See flights The cheapest fare isn’t hiding: you’re just looking on the wrong day
A €212 Friday-evening fare and a €74 fare for the same route in the same week are both real outcomes, and the difference between them comes down to timing: flying out on a Tuesday morning and starting to look six weeks earlier, instead of booking a Friday departure late. That gap, more than €130, is what this page is about.
There’s no secret website. No “clear your cookies at 3am on a Tuesday” trick (that one’s a myth, and here’s why). Cheap flights come down to a handful of decisions you make before you ever hit “book”: when you buy, when you fly, which airline, and what you’re willing to give up. Get those right and the low fare shows up on its own.
Start with a live search so you’re looking at real 2026 prices for your route, not last year’s memory of them:
When should I actually book?
This is the question everyone gets wrong, usually by waiting. The data is consistent across fare studies: short-haul and intra-European flights are cheapest booked around one to three months before departure; long-haul international fares around three to six months out. For peak dates (Christmas, spring break, the summer Europe rush) push that earlier and lock summer flights in by roughly February to April.
The trap is the opposite instinct: waiting for a last-minute plunge. As a rule, airlines raise prices in the final three weeks as seats fill, so the person who “waits to see if it drops” usually pays more, not less. Last-minute deals are real but narrow. They mostly appear on overloaded leisure routes where a carrier would rather fly a discounted seat than an empty one.
And the day you purchase the ticket? Largely a wash. The old “book on Tuesday” advice is mostly folklore now: how far ahead you book swamps any tiny midweek-purchase effect.
What’s the cheapest day to fly?
Different question, real answer. Departing midweek (Tuesday, Wednesday, or a Saturday) is typically the cheapest in Europe, running around 10–15% below a Friday or Sunday. Fridays and Sunday evenings are when everyone wants to travel, so that’s where airlines put the highest prices. Shift your outbound or return by a single day and the saving is often larger than any coupon you’ll ever find.
The tool that surfaces this fastest is a flexible-date price calendar: instead of one date, you see a whole month at a glance and the cheap days light up. Pair it with “search everywhere” style tools when your destination is flexible. They rank the cheapest places you can fly from your home airport, which is how the sub-€40 city breaks reveal themselves.
Are budget airlines really cheaper?
Yes. Until you add the fees. Here’s the honest math for 2026’s biggest low-cost carriers.
| Airline | Free personal item | Larger cabin bag | Checked bag (typical) |
|---|---|---|---|
| Ryanair | Under-seat bag ~40×30×20 cm, no weight limit | ~10 kg (55×40×20 cm) via Priority | 20 kg from around €19–€60 |
| Wizz Air | Under-seat bag ~40×30×20 cm, up to 10 kg | ~10 kg add-on, around €30–€58 | 10–20 kg from around €15 upward |
| easyJet | Under-seat bag ~45×36×20 cm | Cabin bag on higher fares | Charged separately by weight |
The pattern is the same everywhere: the base fare is genuinely cheap, and the bag is where the money moves. A €20 ticket with a €55 checked bag is a €75 ticket, and at that point a full-service carrier that bundles a bag might actually win. So compare totals, not headline fares. (One bit of good news for 2026: the EU has agreed rules requiring fares shown on search sites to include a personal item and a standard cabin bag, though that only fully lands from 2027: for now, budget carriers can still charge, and several tightened their rules for summer 2026.)
My rule of thumb: travelling with just an under-seat bag for a weekend? A budget airline is almost unbeatable. Need a checked bag, an assigned seat, or a flexible ticket? Price the extras first: the “cheap” fare sometimes isn’t.
How do I stop overpaying without checking prices every day?
Set a fare alert and let the price watch you. Pick your route (or destination), and you’ll get pinged when the fare drops: no daily refreshing, no anxiety about missing the dip. Then book when the price looks fair against what you’ve seen, rather than gambling on a further fall that usually doesn’t come.
Two more habits that quietly save money: compare the airline’s own site against the fare you find (sometimes it’s a euro or two more but far cleaner if you need to change or cancel), and factor bags in before you decide, every single time. Booking direct also matters most on complex, multi-leg itineraries, where a third-party’s change fees can turn a small saving into a big headache.
Frequently Asked Questions
How far in advance should I book a flight for the cheapest price?
For domestic and short-haul European flights, the cheapest fares usually land around one to three months out. For long-haul international trips, book roughly three to six months ahead, and earlier for peak dates like Christmas or summer. Booking inside three weeks of departure almost always costs more.
What is the cheapest day of the week to fly?
Flying midweek (Tuesday, Wednesday or a Saturday) is typically cheapest in Europe, running around 10–15% less than a Friday or Sunday departure. The day you buy the ticket matters far less than how far ahead you book and which day you actually fly.
Are budget airlines like Ryanair and Wizz Air actually cheaper?
Often, but only after fees. Ryanair and Wizz Air include a free under-seat personal item (around 40×30×20 cm), yet a larger cabin bag or checked luggage is charged separately, a 20 kg bag can run from around €19 to €60. Add those extras before comparing the headline fare with a full-service airline.
Do flights get cheaper closer to the departure date?
Rarely. Last-minute fares occasionally drop on overloaded leisure routes, but as a rule airlines raise prices in the final three weeks as seats fill. Waiting for a last-minute deal is a gamble; setting a fare alert and booking when the price looks fair is the safer play.
What tools help find the cheapest flights?
Use a flexible-date price calendar and “search everywhere” tools to spot the cheapest routes and days, then set fare alerts so you’re notified when a price drops. Compare the airline’s own site against the fare you find, and always factor in bags before deciding which option is truly cheapest.
Is it safe to book flights through a third-party site?
Booking direct with the airline gives you the cleanest path for changes and refunds. Third-party sites and online travel agencies can be cheaper, but read who actually fulfils the ticket and what their change fees are first. For complex itineraries, the airline’s own site is usually worth a few euros more.