Cheap flights from the United States to London from $272

The month of October is, on average, the cheapest month to fly to London Heathrow Airport from United States, with most prices found around $677. If you’re not able to fly to London Heathrow Airport in October, then February is your next best option. Flight prices from United States to London Heathrow Airport during February average around $680.

Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $646. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $711.

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the morning. momondo users have found flights departing from United States to London Heathrow Airport in the morning for as low as $628. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the evening are often more expensive with an average ticket price of $700.

Fly from Boston Logan Intl to London Heathrow for the best United States - London Heathrow flight prices

You are more likely to see cheaper flights to London Heathrow Airport from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $611 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from United States for as low as $579 on momondo.

United Airlines, KLM, and Delta are the most popular carriers operating from United States to London Heathrow

British Airways, United Airlines and American Airlines are the top three most popular airlines that fly to London Heathrow Airport from United States according to our data. British Airways is the first choice among our users, with 50% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 23 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

Historically, on average around 16% of flights between United States and London have experienced a delay on any given week. The average delay length over the past 12 months has been 158 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

According to our data, Virgin Atlantic have had the least number of delays on this route over the last 12 months; with about 11% of their flights experiencing any sort of delay.

As of May 2026, there are 392 flights per day flying from United States to London Heathrow Airport. The most common time of day flights depart is 7:00PM, with 70% of flights taking off in the evening.

2,747 flights are operational weekly from United States to London Heathrow Airport as of May 2026. The most popular departure day for this route is Mon, with 15% of flights per week taking off on this day.