Cheap flights from London Heathrow Airport to the United States from £307

The month of September is, on average, the cheapest month to fly to United States from London Heathrow Airport, with most prices found around £487. If you are unable to visit United States during the month of September, then departing from London Heathrow Airport during the month February is also very affordable. Most momondo users find prices during this month for around £492.

According to our data, Thursday is the cheapest day to fly to United States from London Heathrow Airport. The lowest ticket price found for a Thursday departure recently was £491. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to United States for around £550.

Our most recent data shows that the best time of day to fly to United States is in the morning. Flights from London Heathrow Airport to United States during this time can be as low as £505. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are £568 on average. Flights to United States from London Heathrow Airport in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to United States from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to United States for around £460 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United States from London Heathrow Airport for as low as £433 on momondo.

United Airlines, SWISS, and Brussels Airlines are the most popular carriers operating from London Heathrow to United States

Virgin Atlantic, British Airways and Lufthansa are the top three most popular airlines that fly to United States from London Heathrow Airport according to our data. Virgin Atlantic is the first choice among our users, with 50% of people opting to fly with this airline when travelling to United States. Keep in mind that there are 25 different airlines that fly to United States on a routine basis, so you have a few additional options to choose from.

Historically, on average around 12% of flights between London and United States have experienced a delay on any given week. The average delay length over the past 12 months has been 155 minutes.

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

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

According to our data, Delta have had the fewest delays on this route over the last 12 months, with about 9% of their flights experiencing any sort of delay.

As of May 2026, there are 372 flights per day flying from London Heathrow Airport to United States. The most common time of day flights depart is 10:00, with 50% of flights taking off in the afternoon.

The number of flights available between London Heathrow Airport and United States is 2,605 per week as of May 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.