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

Return flights

15 Oct - 21 Oct	Air Canada
13 Oct - 21 Oct	TAP
13 Oct - 20 Oct	TAP
14 Oct - 21 Oct	TAP
22 Oct - 29 Oct	Air Canada
14 Oct - 23 Oct	Brussels Airlines
21 Oct - 20 Nov	TAP
06 Oct - 13 Oct	Air Canada
23 Oct - 13 Nov	TAP
15 Oct - 20 Oct	Air Canada
15 Oct - 22 Oct	Air Canada
27 Oct - 07 Nov	TAP
17 Oct - 21 Oct	Air Canada
29 Oct - 04 Nov	SWISS
06 Oct - 01 Nov	Frontier Airlines
29 Oct - 03 Nov	Air Canada
28 Oct - 03 Nov	SWISS
27 Oct - 01 Nov	Alaska Airlines
22 Oct - 15 Nov	SWISS
27 Oct - 22 Nov	TAP

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 $478

Return flights