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

Return flights

25 Aug - 27 Aug	Lufthansa
05 Aug - 22 Sep	Iberia For Level
15 Aug - 17 Aug	British Airways
19 Aug - 26 Aug	TAP
25 Aug - 01 Sep	TAP
04 Aug - 06 Aug	Lufthansa
18 Aug - 29 Aug	TAP
21 Aug - 18 Sep	TAP
25 Aug - 03 Sep	TAP
21 Aug - 03 Sep	Lufthansa
20 Aug - 27 Aug	Lufthansa
22 Aug - 29 Aug	TAP
15 Aug - 29 Aug	Lufthansa
05 Aug - 07 Aug	Air Canada
07 Aug - 08 Sep	TAP
09 Aug - 31 Aug	jetBlue	direct
20 Aug - 01 Sep	Air Canada
27 Aug - 02 Sep	Aer Lingus
23 Aug - 07 Sep	Aer Lingus
26 Aug - 02 Sep	Aer Lingus

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 299€

Return flights