AirHint found the following cheapest return flights from Boston (BOS) to London (LHR) in August 2026 (see full year).

Return flights

22 Aug - 31 Aug	Aer Lingus
15 Aug - 22 Aug	Aer Lingus
01 Aug - 22 Aug	Aer Lingus
24 Aug - 31 Aug	Air Canada
15 Aug - 26 Aug	Aer Lingus
12 Aug - 19 Aug	Aer Lingus
19 Aug - 26 Aug	Aer Lingus
21 Aug - 29 Aug	Aer Lingus
22 Aug - 28 Aug	Aer Lingus
27 Aug - 01 Sep	Aer Lingus
15 Aug - 30 Aug	Aer Lingus
23 Aug - 01 Sep	Aer Lingus
29 Aug - 03 Sep	Air Canada
29 Aug - 07 Sep	Aer Lingus
31 Aug - 08 Sep	Aer Lingus
31 Aug - 08 Sep	Finnair	direct
27 Aug - 01 Sep	Delta	direct
29 Aug - 05 Sep	Air France	direct
29 Aug - 03 Sep	Finnair	direct
29 Aug - 07 Sep	Finnair	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