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

Return flights

13 Oct - 20 Oct	TAP
13 Oct - 08 Nov	TAP
27 Oct - 22 Nov	TAP
29 Oct - 04 Nov	TAP
29 Oct - 22 Nov	TAP
14 Oct - 05 Nov	TAP
29 Oct - 05 Nov	Scandinavian Airlines
14 Oct - 08 Nov	TAP
15 Oct - 08 Nov	Scandinavian Airlines
15 Oct - 22 Oct	Scandinavian Airlines
15 Oct - 27 Oct	Scandinavian Airlines
08 Oct - 23 Oct	Scandinavian Airlines
14 Oct - 21 Oct	Scandinavian Airlines
14 Oct - 23 Oct	Scandinavian Airlines
06 Oct - 01 Nov	Scandinavian Airlines
15 Oct - 23 Oct	Air Canada
07 Oct - 14 Oct	Air Canada
08 Oct - 15 Oct	Air Canada
12 Oct - 20 Oct	Air Canada
28 Oct - 22 Nov	Scandinavian Airlines

Also check the deals for one-way flights from San Francisco to London in October.

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 October from $473

Return flights