Cheap flights from London to Boston from $647

In general, February is the cheapest month to fly from London to Boston. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $786. The month of September is another great option to travel to Boston, with average flight prices from London averaging around $844.

On average, the least expensive day to fly to Boston from London is on a Monday. momondo users have found tickets for Monday departures for as low as $859. However, this price may fluctuate depending on the airline, the season, and holidays. If your travel schedule is flexible, try to avoid departing on a Tuesday because tickets tend to average around $1,720. These prices are subject to change though, so be sure to set up a Price Alert for flights to Boston.

According to our data, the cheapest time of day to fly to Boston is in the afternoon. momondo users have found flights departing from London to Boston in the afternoon for as low as $1,040. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In the morning is when there is more demand to fly to Boston, so prices are often more expensive at around $1,485 per ticket.

Fly from London Gatwick to Boston Logan Intl for the best London - Boston Logan Intl flight prices

You are more likely to see cheaper flights to Boston from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Boston for around $963 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Boston from London for as low as $905 on momondo.

There are 2 cabin classes available to choose from on London to Boston flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 63% on your flight if you consider stops on a London to Boston flight.

As of August 2026, prices for London to Boston flights are approximately 17% cheaper when compared to flights at the same time last year.

Historically, on average around 9% of flights between London and Boston 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 departing in the early afternoon have, in the past, seen delays more frequently in comparison.

Saturday is statistically the day of the week that experiences the fewest delays on this flight route. Tuesday 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 5% of their flights experiencing any sort of delay.

33 flights are operational daily from London to Boston as of August 2026. The most popular departure time for this route is 09:00, with 36% of flights per day taking off at midday.

The number of flights available between London and Boston is 233 per week as of August 2026. The most frequent departure day is Mon, with 17% of weekly flights leaving on this day.