Cheap flights from London to Boston from £344

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 £416. The month of September is another great option to travel to Boston, with average flight prices from London averaging around £433.

The cheapest day to depart on your flight to Boston is on a Wednesday when prices can be found for as low as £559. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around £610. These prices are subject to change though, so be sure to set up a Price Alert for flights to Boston.

Our most recent data shows that the best time of day to fly to Boston is at midday. Flights from London to Boston during this time can be as low as £531. In the evening is when there is more demand to fly to Boston, so prices are often more expensive at around £685 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 £505 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 £476 on momondo.

There are 4 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 5% on your flight if you consider stops on a London to Boston flight.

As of July 2026, prices for London to Boston flights are approximately 15% cheaper when compared to flights at the same time last year.

Lufthansa, British Airways, and Iberia are the most popular carriers operating from London to Boston Logan Intl

Virgin Atlantic, British Airways and KLM are the top three most popular airlines that fly to Boston from London according to our data. Virgin Atlantic is the first choice among our users, with 44% of people opting to fly with this airline when travelling to Boston. Keep in mind that there are 16 different airlines that fly to Boston on a routine basis, so you have a few additional options to choose from.

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.

Reykjavik (KEF) was the most common stop: 43% of momondo users choosing one-stop flights on this route connected there.

Flights via New York (JFK) offer the lowest average return price of £331.

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 10h 22m.

Zurich (ZRH) has the shortest average stopover time for this route: 1h 08m.

As of July 2026, 38 flights take off from London and land in Boston each day. The most common flight departure time for this route is 09:00, with 36% of daily flights taking off at midday.

The number of flights available between London and Boston is 266 per week as of July 2026. The most frequent departure day is Fri, with 15% of weekly flights leaving on this day.