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

Return flights

07 Oct - 21 Oct	TAP
06 Oct - 13 Oct	TAP
01 Oct - 15 Oct	TAP
15 Oct - 20 Oct	TAP
07 Oct - 14 Oct	TAP
09 Oct - 13 Oct	TAP
15 Oct - 29 Oct	Finnair	direct
01 Oct - 21 Oct	Delta
14 Oct - 22 Oct	Delta
15 Oct - 22 Oct	Delta
01 Oct - 12 Nov	Delta
29 Oct - 05 Nov	British Airways	direct
29 Oct - 04 Nov	British Airways	direct
11 Oct - 03 Nov	Scandinavian Airlines
26 Oct - 02 Nov	Delta	direct
31 Oct - 16 Nov	Air Canada
30 Oct - 15 Nov	British Airways	direct
30 Oct - 16 Nov	British Airways	direct
31 Oct - 15 Nov	British Airways	direct
11 Oct - 02 Nov	British Airways	direct

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 384€

Return flights