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

Return flights

18 Aug - 27 Aug	SWISS
10 Aug - 26 Aug	SWISS
13 Aug - 19 Aug	SWISS
14 Aug - 28 Aug	SWISS
07 Aug - 18 Aug	SWISS
14 Aug - 19 Aug	SWISS
05 Aug - 01 Sep	ITA Airways
25 Aug - 04 Sep	British Airways
04 Aug - 09 Sep	TAP
24 Aug - 06 Sep	Alaska Airlines
22 Aug - 29 Aug	Alaska Airlines
14 Aug - 31 Aug	Frontier Airlines
11 Aug - 19 Aug	Air Canada
23 Aug - 06 Sep	Hawaiian Airlines
13 Aug - 17 Sep	ITA Airways
09 Aug - 25 Aug	SWISS
21 Aug - 02 Sep	Alaska Airlines
21 Aug - 12 Sep	Alaska Airlines
27 Aug - 03 Sep	Alaska Airlines
31 Aug - 17 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 $495

Return flights