Cheap flights from London Heathrow Airport to the United States from $406

In general, February 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 $659. If you aren’t able to travel during the month of February, then book flights to United States from London Heathrow Airport during September instead. Flights to United States in September, while not as cheap as those in February, still average around $699.

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 $660. 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 $696. 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 $676. Try not to purchase tickets in the afternoon because they tend to be around $710. 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 $653 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.

There are 4 cabin classes available to choose from on London Heathrow Airport to United States flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

United Airlines, British Airways, and Finnair 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 51% 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 13% 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 157 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, Delta 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 June 2026, there are 365 flights per day flying from London Heathrow Airport to United States. The most common time of day flights depart is 4:00PM, with 49% of flights taking off in the afternoon.

As of June 2026, there are 2,561 flights per week flying from London Heathrow Airport to United States. The most common day of the week flights depart is Sun, with 15% of flights taking off on this day.