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

Return flights

26 Aug - 02 Sep	Air Canada
24 Aug - 26 Aug	Virgin Atlantic
29 Aug - 31 Aug	Iberia
10 Aug - 28 Aug	Lufthansa
24 Aug - 02 Sep	Lufthansa
10 Aug - 28 Aug	jetBlue	direct
11 Aug - 29 Aug	jetBlue
17 Aug - 27 Aug	Air Canada
21 Aug - 31 Aug	jetBlue
23 Aug - 31 Aug	jetBlue
18 Aug - 31 Aug	jetBlue
10 Aug - 31 Aug	jetBlue
18 Aug - 01 Sep	Air Canada
31 Aug - 06 Sep	Lufthansa
29 Aug - 12 Sep	Lufthansa
31 Aug - 30 Sep	Icelandair
29 Aug - 13 Sep	Lufthansa
18 Aug - 01 Sep	Finnair	direct
30 Aug - 13 Sep	Icelandair
21 Aug - 08 Sep	United

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

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.

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Cheapest return flights from Boston to London in August from 337€

Return flights