Cheap flights from Boston to London from C$ 367

In general, January is the cheapest month to fly from Boston to London. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 712. If you aren’t able to travel to London during the month of January, then flying in September is also cheap. Prices for this month can be found on momondo for an average of C$ 737.

According to our data, Monday is the cheapest day to fly to London from Boston. The lowest ticket price found for a Monday departure recently was C$ 818. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Boston to London for around C$ 986.

Our most recent data shows that the best time of day to fly to London is in the afternoon. Flights from Boston to London during this time can be as low as C$ 704. In the evening is when there is more demand to fly to London, so prices are often more expensive at around C$ 922 per ticket.

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 C$ 864 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Boston for as low as C$ 833 on momondo.

You could potentially save up to 30% on your flight if you consider stops on a Boston to London flight.

As of May 2026, prices for Boston to London flights are approximately 13% cheaper when compared to flights at the same time last year.

Historically, on average around 10% 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 144 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.

Wednesday 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, Virgin Atlantic has had the least delays on this route over the last 12 months, with about 7% of their flights experiencing any sort of delay.

As of May 2026, 28 flights take off from Boston and land in London each day. The most common flight departure time for this route is 7:00p.m., with 100% of daily flights taking off in the evening.

As of May 2026, there are 196 flights per week flying from Boston to London. The most common day of the week flights depart is Wed, with 17% of flights taking off on this day.