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

Return flights

11 Aug - 02 Sep	Icelandair
13 Aug - 02 Sep	Icelandair
20 Aug - 27 Aug	Icelandair
20 Aug - 03 Sep	Icelandair
18 Aug - 26 Aug	Icelandair
25 Aug - 09 Sep	Icelandair
20 Aug - 09 Sep	Spirit Airlines
07 Aug - 02 Sep	TAP
26 Aug - 02 Sep	Icelandair
20 Aug - 31 Aug	TAP
18 Aug - 24 Aug	TAP
25 Aug - 31 Aug	TAP
13 Aug - 18 Aug	Air Canada
04 Aug - 29 Aug	TAP
11 Aug - 26 Aug	Icelandair
25 Aug - 27 Aug	Icelandair
19 Aug - 26 Aug	Icelandair
07 Aug - 08 Sep	Spirit Airlines
28 Aug - 09 Sep	Icelandair
24 Aug - 01 Sep	TAP

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 $352

Return flights