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

Return flights

21 Aug - 27 Aug	TAP
18 Aug - 26 Aug	Aer Lingus
21 Aug - 09 Sep	TAP
21 Aug - 03 Sep	TAP
20 Aug - 03 Sep	American Airlines
05 Aug - 28 Aug	Virgin Atlantic
06 Aug - 13 Aug	Air France
11 Aug - 24 Aug	Hawaiian Airlines
04 Aug - 01 Sep	SWISS
09 Aug - 25 Aug	Frontier Airlines
14 Aug - 25 Aug	Frontier Airlines
12 Aug - 19 Aug	Aer Lingus
10 Aug - 22 Aug	Frontier Airlines
17 Aug - 29 Aug	Hawaiian Airlines
15 Aug - 17 Sep	Hawaiian Airlines
12 Aug - 01 Sep	Hawaiian Airlines
28 Aug - 07 Sep	Frontier Airlines
05 Aug - 24 Sep	Frontier Airlines
16 Aug - 01 Sep	Hawaiian Airlines
13 Aug - 01 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 359€

Return flights