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	Air Canada
02 Aug - 05 Aug	Air Canada
05 Aug - 06 Aug	Air Canada
25 Aug - 08 Sep	Icelandair
26 Aug - 02 Sep	Icelandair
12 Aug - 31 Aug	TAP
04 Aug - 19 Aug	TAP
11 Aug - 02 Sep	Icelandair
13 Aug - 02 Sep	Icelandair
19 Aug - 26 Aug	TAP
21 Aug - 26 Aug	TAP
19 Aug - 31 Aug	TAP
27 Aug - 03 Sep	Icelandair
10 Aug - 03 Sep	Icelandair
14 Aug - 31 Aug	TAP
25 Aug - 31 Aug	TAP
07 Aug - 02 Sep	TAP
07 Aug - 08 Sep	TAP
25 Aug - 09 Sep	TAP
24 Aug - 07 Sep	Air Canada

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 $365

Return flights