Cheap flights from the United States to London from $172

The cheapest month to fly to London from United States is in February. Flight prices, which tend to average around $657, are often lower during this time because this is during the off-season. The month of January is another great option to travel to London, with average flight prices from United States averaging around $674.

The cheapest day to depart from United States to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $771. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $805. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

Flying to London from United States in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $757 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $816. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Los Angeles to London Gatwick for the best United States - London flight prices

You are more likely to see cheaper flights to London from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around $727 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from United States for as low as $671 on momondo.

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

Norse Atlantic UK, British Airways, and KLM are the most popular carriers operating from United States to London

British Airways, United Airlines and American Airlines are the top three most popular airlines that fly to London from United States according to our data. British Airways is the first choice among our users, with 45% of people opting to fly with this airline when traveling to London. Keep in mind that there are 26 different airlines that fly to London 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 at night have, in the past, seen delays more frequently in comparison.

Saturday 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 11% of their flights experiencing any sort of delay.

375 flights are operational daily from United States to London as of September 2026. The most popular departure time for this route is 7:00PM, with 57% of flights per day taking off in the evening.

2,628 flights are operational weekly from United States to London as of September 2026. The most popular departure day for this route is Mon, with 16% of flights per week taking off on this day.