When to Book Flights for the Cheapest Prices

Timing is one of the most controllable variables in the price you pay for a flight. Book too far ahead and you pay a premium for certainty. Book too late and the cheap seats are gone. The sweet spot depends on the type of route — and on your flexibility.

The general booking curve

Airline pricing follows a rough U-shaped curve over the booking horizon:

• Very early (6+ months ahead): fares are often mid-range. Airlines have not yet felt demand pressure and have not opened deep discount buckets.
• Sweet spot (varies by route — see below): cheap fare classes are open and the plane is filling fast enough to create urgency.
• Late (under 3 weeks): cheap classes have closed, remaining seats are at premium pricing. Exceptions exist for poorly-selling flights, but these are unpredictable.

Booking windows by route type

Short-haul Europe (under 3 hours)

Book 4–8 weeks ahead for the best odds. This covers most UK-to-Europe leisure routes: London to Barcelona, Amsterdam, Rome, Lisbon, etc. Avoid the final two weeks unless you are gambling on a last-minute drop.

Medium-haul (3–6 hours)

Routes such as London to Tenerife, Sharm El Sheikh, Istanbul, or Marrakech tend to have their lowest fares 8–14 weeks before departure. These are heavily package-holiday routes, so pricing is also influenced by tour operator block bookings releasing unsold seats.

Long-haul (6+ hours)

Book 3–5 months ahead for transatlantic, Southeast Asian, and East African routes. Premium cabin pricing on these routes can be significantly cheaper if booked 6+ months ahead — airlines use early bookers to underwrite their revenue forecasts.

The day-of-week myth

You may have read that flights are cheapest when searched on a Tuesday or Wednesday. This is largely an urban myth that has persisted for years. Modern airline pricing systems update in near-real time, running hundreds of micro-adjustments per day based on booking pace, competitor prices, and remaining inventory. The day of the week you search has no statistically meaningful impact on the price.

What does matter:

• **Travel day**: flying on a Tuesday or Wednesday is genuinely cheaper for the outbound leg on most leisure routes. Weekends and Monday mornings command a premium.
• **Departure time**: very early morning (before 7am) and late night flights (after 9pm) are consistently cheaper than peak hours.

Shoulder season strategy

The cheapest prices combine a good booking window with shoulder-season travel dates. Shoulder season varies by destination:

• Southern Europe (Spain, Italy, Greece): April–May and mid-September to October.
• Scandinavia: May and September.
• Caribbean: May–June and late October to November.
• Southeast Asia: April–May and October–November.

Flying in shoulder season means lower fares, thinner crowds, and often better weather than peak summer. For most European city-break destinations, the shoulder season is genuinely the best time to visit.

Setting a target price

Rather than trying to time the market perfectly, set a target price for your route and book when it is hit. This removes the emotional element of wondering whether the price will drop further.

FairFares shows each deal as a percentage below the 30-day median for that route. If the fare is more than 30 % below median, it is unusual and worth acting on quickly — those fares typically disappear within 24–48 hours.