Cheap flights from Boston to London from £209

In general, January is the cheapest month to fly from Boston to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £390. The month of February is another great option to travel to London Heathrow Airport, with average flight prices from Boston averaging around £411.

On average, the least expensive day to fly to London Heathrow Airport from Boston is on a Monday. momondo users have found tickets for Monday departures for as low as £511. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Tuesday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Tuesday is £570.

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Boston to London Heathrow Airport in the afternoon for as low as £460. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are £580 on average. Flights to London Heathrow Airport from Boston in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to London Heathrow Airport from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £541 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Boston for as low as £485 on momondo.

There are 4 cabin classes available to choose from on Boston to London Heathrow Airport 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 7% on your flight if you consider stops on a Boston to London Heathrow Airport flight.

As of September 2026, prices for Boston to London Heathrow Airport flights are approximately 20% cheaper when compared to flights at the same time last year.

United Airlines and KLM are the most popular carriers operating from Boston Logan Intl to London Heathrow

British Airways, Virgin Atlantic and Iberia are the top three most popular airlines that fly to London Heathrow Airport from Boston according to our data. British Airways is the first choice among our users, with 44% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 8 different airlines that fly to London Heathrow Airport 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 8% of their flights experiencing any sort of delay.

As of September 2026, 33 flights take off from Boston and land in London Heathrow Airport each day. The most common flight departure time for this route is 19:00, with 86% of daily flights taking off in the evening.

As of September 2026, 231 flights take off from Boston and land in London Heathrow Airport each week. The most common flight departure day for this route is Thu, with 16% of weekly flights taking off on this day.