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

Return flights

06 Oct - 13 Oct	TAP
11 Oct - 20 Oct	TAP
03 Oct - 19 Oct	Frontier Airlines
06 Oct - 15 Oct	SWISS
07 Oct - 21 Oct	SWISS
15 Oct - 23 Oct	SWISS
02 Oct - 07 Oct	Iberia For Level
01 Oct - 14 Oct	SWISS
16 Oct - 22 Oct	TAP
03 Oct - 06 Oct	SWISS
25 Oct - 02 Nov	SWISS
22 Oct - 05 Nov	Air Canada
25 Oct - 03 Nov	Alaska Airlines
25 Oct - 01 Nov	SWISS
23 Oct - 02 Nov	TAP
25 Oct - 08 Nov	SWISS
27 Oct - 10 Nov	Turkish Airlines
17 Oct - 06 Nov	jetBlue

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 $420

Return flights