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

Return flights

22 Aug - 07 Sep	Iberia
19 Aug - 10 Sep	United
26 Aug - 10 Sep	United
17 Aug - 06 Sep	Lufthansa
19 Aug - 13 Sep	Lufthansa
20 Aug - 13 Sep	Lufthansa
26 Aug - 02 Sep	Lufthansa
17 Aug - 21 Aug	jetBlue	direct
21 Aug - 31 Aug	jetBlue	direct
18 Aug - 25 Aug	jetBlue	direct
22 Aug - 31 Aug	jetBlue	direct
22 Aug - 26 Aug	Iberia
20 Aug - 27 Aug	jetBlue	direct
19 Aug - 26 Aug	jetBlue	direct
19 Aug - 26 Aug	Iberia
19 Aug - 27 Aug	jetBlue	direct
17 Aug - 31 Aug	jetBlue	direct
19 Aug - 01 Sep	jetBlue	direct
22 Aug - 07 Sep	jetBlue	direct
20 Aug - 05 Sep	jetBlue	direct

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 $502

Return flights