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

Return flights

13 Oct - 27 Oct	SWISS
28 Oct - 04 Nov	Aer Lingus
02 Oct - 06 Oct	Iberia For Level
14 Oct - 28 Oct	Alaska Airlines
10 Oct - 31 Oct	Alaska Airlines
17 Oct - 09 Nov	Frontier Airlines
29 Oct - 12 Nov	Air Canada
17 Oct - 28 Oct	Alaska Airlines
27 Oct - 10 Nov	SWISS
10 Oct - 14 Oct	Frontier Airlines
19 Oct - 01 Nov	SWISS
23 Oct - 02 Nov	TAP
30 Oct - 13 Nov	SWISS
03 Oct - 06 Oct	Frontier Airlines
12 Oct - 25 Oct	Alaska Airlines
06 Oct - 18 Oct	TAP
15 Oct - 25 Oct	TAP
24 Oct - 08 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 424€

Return flights