Cheap flights from the United States to London from £209

In general, October is the cheapest month to fly from United States to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £500. The month of February is another great option to travel to London Heathrow Airport, with average flight prices from United States averaging around £502.

On average, the least expensive day to fly to London Heathrow Airport from United States is on a Monday. momondo users have found tickets for Monday departures for as low as £399. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £464.

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 £415. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £448 on average. Flights to London Heathrow Airport from United States in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from San Francisco 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 £454 when searching weeks before you fly. 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 £439 on momondo.

LEVEL, Virgin Atlantic, and KLM are the most popular carriers operating from United States to London Heathrow

Virgin Atlantic, British Airways and United Airlines are the top three most popular airlines that fly to London Heathrow Airport from United States according to our data. Virgin Atlantic is the first choice among our users, with 41% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 16 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 159 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing at night 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, Virgin Atlantic have had the fewest delays on this route over the last 12 months, with about 11% of their flights experiencing any sort of delay.

The number of flights available between United States and London Heathrow Airport is 391 per day as of May 2026. The most frequent departure time is 19:00, with 70% of daily flights leaving in the evening.

2,742 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.