Cheap flights from London to Boston from $393

In general, September 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 $528. If you aren’t able to travel during the month of September, then book flights to Boston from London during February instead. Flights to Boston in February, while not as cheap as those in September, still average around $544.

The cheapest day to depart from London to Boston is on a Wednesday when prices can be found for as low as $696. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to Boston on Saturday is $790.

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 $701. 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 evening is when there is more demand to fly to Boston, so prices are often more expensive at around $799 per ticket.

Fly from London Heathrow 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 $634 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Boston from London for as low as $571 on momondo.

There are 4 cabin classes available to choose from on London to Boston Logan Intl 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 29% on your flight if you consider stops on a London to Boston flight.

As of February 2026, prices for London to Boston flights are approximately 105% more expensive when compared to flights at the same time last year.

SWISS, Lufthansa, and LEVEL are the most popular carriers operating from London to Boston Logan Intl

British Airways, Delta and American Airlines are the top three most popular airlines that fly to Boston from London according to our data. British Airways is the first choice among our users, with 56% of people opting to fly with this airline when traveling to Boston. Keep in mind that there are 9 different airlines that fly to Boston on a routine basis, so you have a few additional options to choose from.

Historically, on average around 8% 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 153 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.

Thursday 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 4% of their flights experiencing any sort of delay.

Reykjavik (KEF) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Flights via Lisbon (LIS) offer the lowest average round-trip price of $460.

Flights connecting via Reykjavik (KEF) have the shortest average one-way travel time: 10h 30m.

Reykjavik (KEF) has the shortest average layover time for this route: 1h 33m.

As of February 2026, there are 28 flights per day flying from London to Boston. The most common time of day flights depart is 1:00PM, with 45% of flights taking off in the afternoon.

201 flights are operational weekly from London to Boston as of February 2026. The most popular departure day for this route is Sat, with 16% of flights per week taking off on this day.