Cheap flights from London to the United States from $420

In general, September is the cheapest month to fly from London to United States. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $613. If you aren’t able to travel during the month of September, then book flights to United States from London during February instead. Flights to United States in February, while not as cheap as those in September, still average around $631.

According to our data, Thursday is the cheapest day to fly to United States from London. 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 Gatwick to Miami for the best London - United States flight prices

You are more likely to see cheaper flights to United States from London when booking weeks ahead of your departure date. In general, you can expect to find flights to United States for around $626 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 for as low as $590 on momondo.

Norse Atlantic UK, SWISS, and United Airlines are the most popular carriers operating from London to United States

British Airways, Virgin Atlantic and American Airlines are the top three most popular airlines that fly to United States from London 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 19 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 154 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, 238 flights take off from London and land in United States each day. The most common flight departure time for this route is 10:00AM, with 50% of daily flights taking off in the afternoon.

As of May 2026, there are 1,669 flights per week flying from London to United States. The most common day of the week flights depart is Fri, with 15% of flights taking off on this day.