$144 Cheap flights to London Heathrow Airport

Most travelers find the cheapest round-trip airfare to London Heathrow Airport when booking during the month of September.

From most locations, booking your flights to London Heathrow Airport around 50 days prior to your departure date finds the best deals.

From most locations, the cheapest day to fly to London Heathrow Airport is Wednesday. Most users found that departing on a Saturday was most expensive.

In general, when looking for the cheapest flight to London Heathrow Airport, our data indicates that Noon flights are the most cost-effective. Afternoon flights tend to be the most expensive.

Those flying to London Heathrow Airport could potentially find better pricing at London City Airport (8 mi from London city center), London Gatwick Airport (24 mi from London city center), London Luton Airport (28 mi from London city center), London Stansted Airport (31 mi from London city center) or London Southend Airport (36 mi from London city center) depending on the month and departure airport.

With an average price of $128 per person, London Southend Airport is the cheapest airport to fly into when planning your trip to London. This price can fluctuate based on where you are flying from. momondo’s Airport-to-Airport Pricing Tool can help users find the best prices.

$19 is the cheapest deal found on momondo in the last two weeks for a flight to London. This flight is from Barcelona and is 93% cheaper than most flights to London. To find the cheapest price to London from your area, use momondo’s Airport-to-Airport Pricing Tool.

Of the 23 airlines that fly to London Heathrow Airport, British Airways, United Airlines and Delta happen to be the most favored based on our user data. British Airways is the most popular among the three airlines, with 49% of users choosing them for their travels to London Heathrow Airport.

Prices for flights to London Heathrow Airport refresh daily.

As of October 2025, there are 79 operators available to choose from for flights to London Heathrow Airport.

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel to London Heathrow Airport.

The required travel and health documents for your London Heathrow Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London Heathrow Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.