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

Return flights

23 Aug - 31 Aug	jetBlue	direct
21 Aug - 28 Aug	jetBlue
16 Aug - 23 Aug	jetBlue
20 Aug - 27 Aug	Lufthansa
20 Aug - 02 Sep	Lufthansa
26 Aug - 02 Sep	Lufthansa
20 Aug - 26 Aug	jetBlue	direct
22 Aug - 29 Aug	jetBlue
17 Aug - 24 Aug	jetBlue
19 Aug - 26 Aug	jetBlue	direct
16 Aug - 20 Aug	jetBlue
17 Aug - 25 Aug	jetBlue	direct
21 Aug - 02 Sep	jetBlue	direct
31 Aug - 06 Sep	Lufthansa
26 Aug - 02 Sep	Virgin Atlantic	direct
20 Aug - 02 Sep	jetBlue	direct
16 Aug - 06 Sep	SWISS
20 Aug - 04 Sep	United
19 Aug - 24 Sep	United
25 Aug - 01 Sep	Virgin Atlantic

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 400€

Return flights