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

Return flights

09 Oct - 04 Nov	SWISS
29 Oct - 17 Nov	SWISS
31 Oct - 17 Nov	SWISS
08 Oct - 08 Nov	SWISS
08 Oct - 09 Nov	SWISS
28 Oct - 10 Nov	SWISS
09 Oct - 03 Nov	SWISS
14 Oct - 04 Nov	SWISS
29 Oct - 05 Nov	SWISS
27 Oct - 03 Nov	SWISS
07 Oct - 14 Oct	SWISS
07 Oct - 19 Oct	SWISS
09 Oct - 14 Oct	Aer Lingus
09 Oct - 15 Oct	Aer Lingus
08 Oct - 12 Oct	Aer Lingus
08 Oct - 13 Oct	SWISS
07 Oct - 15 Oct	Aer Lingus
07 Oct - 13 Oct	Aer Lingus
23 Oct - 28 Oct	SWISS
09 Oct - 12 Oct	Aer Lingus

Also check the deals for one-way flights from London to San Francisco 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 London to San Francisco in October from 358€

Return flights