Cheap flights from the United States to London from £133

The cheapest month to fly to London from United States is in September. Flight prices, which tend to average around £379, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from United States averaging around £388.

Our data shows that Monday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £400. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from United States to London for around £452.

The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as £415. Flights in the evening are often more expensive, with an average ticket price of £440.

Fly from New York John F Kennedy Intl 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 £448 when searching weeks before you fly. 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 £433 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.

TAP AIR PORTUGAL, Icelandair, and Norse Atlantic UK are the most popular carriers operating from United States to London

British Airways, Virgin Atlantic and United 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 42% of people opting to fly with this airline when travelling to London. Keep in mind that there are 17 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

Historically, on average around 17% 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 155 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.

235 flights are operational daily from United States to London as of March 2026. The most popular departure time for this route is 20:00, with 80% of flights per day taking off in the evening.

1,651 flights are operational weekly from United States to London as of March 2026. The most popular departure day for this route is Mon, with 16% of flights per week taking off on this day.