AirHint found the following cheapest return flights from London (LHR) to San Francisco (SFO) in August 2026 (see full year).

Return flights

24 Aug - 14 Sep	Air Canada
26 Aug - 09 Sep	Air Canada
28 Aug - 04 Sep	Scandinavian Airlines
24 Aug - 30 Aug	Scandinavian Airlines
25 Aug - 30 Aug	Scandinavian Airlines
21 Aug - 06 Sep	Air Canada
20 Aug - 03 Sep	SWISS
26 Aug - 09 Sep	Finnair	direct
11 Aug - 18 Aug	TAP
05 Aug - 12 Aug	TAP
12 Aug - 19 Aug	TAP
28 Aug - 04 Sep	British Airways	direct
19 Aug - 30 Aug	Scandinavian Airlines
17 Aug - 31 Aug	Scandinavian Airlines
21 Aug - 06 Sep	British Airways	direct
06 Aug - 20 Aug	TAP
05 Aug - 26 Aug	TAP
05 Aug - 24 Aug	TAP
09 Aug - 02 Sep	TAP
20 Aug - 03 Sep	Finnair	direct

Also check the deals for one-way flights from London to San Francisco 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 London to San Francisco in August from 477€

Return flights