Cheap flights from Boston to London from £189

The cheapest month to fly to London from Boston is in January. Flight prices, which tend to average around £389, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Boston averaging around £400.

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 £443. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Boston to London for around £566.

The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as £400. Flights in the morning are often more expensive, with an average ticket price of £575.

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

You are more likely to see cheaper flights to London from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around £524 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 Boston for as low as £485 on momondo.

There are 4 cabin classes available to choose from on Boston to London 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 26% on your flight if you consider stops on a Boston to London flight.

As of August 2026, prices for Boston to London flights are approximately 40% cheaper when compared to flights at the same time last year.

Icelandair, Virgin Atlantic, and Aer Lingus are the most popular carriers operating from Boston Logan Intl to London

British Airways, Virgin Atlantic and Iberia are the top three most popular airlines that fly to London from Boston according to our data. British Airways is the first choice among our users, with 43% of people opting to fly with this airline when travelling to London. Keep in mind that there are 7 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

Historically, on average around 11% of flights between Boston and London have experienced a delay on any given week. The average delay length over the past 12 months has been 146 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.

Monday 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, American Airlines have had the fewest delays on this route over the last 12 months, with about 9% of their flights experiencing any sort of delay.

Shannon (SNN) was the most common stop: 33% of momondo users choosing one-stop flights on this route connected there.

Flights via Shannon (SNN) offer the lowest average return price of £355.

Flights connecting via Shannon (SNN) have the shortest average one-way travel time: 8h 50m.

Amsterdam (AMS) has the shortest average stopover time for this route: 1h 00m.

The number of flights available between Boston and London is 38 per day as of August 2026. The most frequent departure time is 19:00, with 86% of daily flights leaving in the evening.

As of August 2026, 266 flights take off from Boston and land in London each week. The most common flight departure day for this route is Tue, with 15% of weekly flights taking off on this day.