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

Return flights

21 Aug - 03 Sep	TAP
21 Aug - 28 Aug	TAP
21 Aug - 26 Aug	TAP
21 Aug - 27 Aug	TAP
21 Aug - 09 Sep	TAP
21 Aug - 02 Sep	TAP
13 Aug - 20 Aug	Air Canada
18 Aug - 26 Aug	Air Canada
19 Aug - 26 Aug	Air Canada
12 Aug - 11 Sep	Air Canada
13 Aug - 20 Aug	Lufthansa	direct
20 Aug - 02 Sep	Virgin Atlantic
20 Aug - 03 Sep	Virgin Atlantic
18 Aug - 01 Sep	Virgin Atlantic
05 Aug - 12 Aug	Lufthansa
11 Aug - 18 Aug	Virgin Atlantic
05 Aug - 18 Aug	Virgin Atlantic
20 Aug - 02 Sep	British Airways	direct
20 Aug - 03 Sep	British Airways	direct
19 Aug - 02 Sep	Delta

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