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

Return flights

05 Aug - 21 Aug	Virgin Atlantic
18 Aug - 04 Sep	Air France
13 Aug - 20 Aug	SWISS
05 Aug - 19 Aug	SWISS
04 Aug - 19 Aug	SWISS
03 Aug - 19 Aug	SWISS
19 Aug - 31 Aug	Virgin Atlantic
18 Aug - 31 Aug	Virgin Atlantic
06 Aug - 20 Aug	Air Canada
21 Aug - 12 Sep	Frontier Airlines
18 Aug - 28 Aug	Frontier Airlines
17 Aug - 27 Aug	Alaska Airlines
24 Aug - 26 Sep	Frontier Airlines
20 Aug - 03 Sep	Alaska Airlines
22 Aug - 08 Sep	Air Canada
24 Aug - 10 Sep	Alaska Airlines
12 Aug - 03 Sep	Alaska Airlines
15 Aug - 07 Sep	Hawaiian Airlines
15 Aug - 01 Sep	Frontier Airlines
23 Aug - 03 Sep	Alaska Airlines

Also check the deals for one-way flights from San Francisco 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 San Francisco to London in August from 417€

Return flights