Flying from Heathrow can cost hundreds more if you choose the wrong dates, so a few days’ flexibility can pay off.

The biggest price spikes in flights coincide with UK school holidays and bank holidays, particularly at Easter, in summer, and over Christmas and New Year.

In peak periods Heathrow handles more than 5 million passengers a month, so bargain seats dry up.

Heathrow Airport, where peak travel demand can push up fares during the busiest weeks. (Image: NQ)

On many long-haul routes, late April to early June and September to early December usually start cheaper than school-holiday weeks, except October half-term.

On routes like Heathrow to the US, India and Orlando, data suggests the cheapest months are usually outside holiday peaks, often May and September.

Cheapest days and times to fly from Heathrow

Fare calendars suggest Tuesday and Wednesday flights are usually cheaper than Fridays and Sundays, when demand is highest.

Late-night or overnight long-haul flights can be cheaper than morning departures on the same day, though they’re less convenient.

Use “whole month” or “cheapest month” search tools with Heathrow as your starting airport to find the lowest fares.

Try moving your trip a few days either side of your chosen date.

Check nearby airports such as Gatwick, Stansted, Luton and City to see when Heathrow costs more, and decide if it’s worth paying extra.

Best and worst months for Heathrow flight prices

Gatwick Airport, one of the alternative London airports travellers can compare when Heathrow fares are higher. (Image: NQ)

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January, February and early March are often best value from Heathrow, along with late autumn outside school holidays when demand is lower.

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Expect the highest prices in the summer school holidays and around Christmas, New Year and Easter.

Analysis suggests Tuesday and Wednesday flights are usually cheaper because fewer people travel midweek.

Fridays and Sundays usually cost more because they’re the busiest days to fly.

Price-tracking sites suggest booking short-haul flights six to 10 weeks ahead, and long-haul 10 to 18 weeks ahead, for best value.