Cheapest return flights from Boston to London in August from $581

Best time to book flights for Boston (BOS) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from Boston (BOS) to London (LHR) in August 2025 (see full year).

Return flights

29 Aug - 03 Sep Fly Play
20 Aug - 27 Aug Scandinavian Airlines
19 Aug - 26 Aug Icelandair
11 Aug - 20 Aug Icelandair
25 Aug - 01 Sep Icelandair
20 Aug - 27 Aug Finnair direct
31 Aug - 08 Sep Icelandair
22 Aug - 29 Aug Air France direct
25 Aug - 01 Sep Delta direct
20 Aug - 25 Aug Icelandair
14 Aug - 24 Aug British Airways direct
15 Aug - 23 Aug British Airways direct
20 Aug - 25 Aug British Airways direct
19 Aug - 26 Aug Finnair direct
28 Aug - 02 Sep Icelandair
31 Aug - 12 Sep Icelandair
30 Aug - 09 Sep Iberia
30 Aug - 04 Sep Iberia
30 Aug - 09 Sep Finnair direct
29 Aug - 03 Sep Finnair direct

Also check the deals for one-way flights from Boston to London in August.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in London

Cheap car rent in London