Cheap flights from London Heathrow Airport to the United States from $423

In general, September is the cheapest month to fly from London Heathrow Airport to United States. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $663. If you aren’t able to travel during the month of September, then book flights to United States from London Heathrow Airport during February instead. Flights to United States in February, while not as cheap as those in September, still average around $670.

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 $641. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $690. These prices are subject to change though, so be sure to set up a Price Alert for flights to United States.

The cheapest time of day to fly to United States is at noon when flights can be purchased for as low as $635. Try not to purchase tickets in the evening because they tend to be around $697. Of course, these prices can vary depending on the time of year and what airport you fly to.

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 $618 when searching weeks out. 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 $573 on momondo.

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

British Airways, Virgin Atlantic and Delta are the top three most popular airlines that fly to United States from London Heathrow Airport 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 United States. Keep in mind that there are 18 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 in the early afternoon 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 9% of their flights experiencing any sort of delay.

As of May 2026, there are 369 flights per day flying from London Heathrow Airport to United States. The most common time of day flights depart is 4:00PM, with 51% of flights taking off in the afternoon.

As of May 2026, there are 2,586 flights per week flying from London Heathrow Airport to United States. The most common day of the week flights depart is Mon, with 15% of flights taking off on this day.