AirHint found the following cheapest return flights from San Francisco (SFO) to London (LGW) in January 2026 (see full year).

Return flights

16 Jan - 27 Jan	TAP
12 Jan - 25 Jan	TAP
21 Jan - 05 Feb	TAP
24 Jan - 10 Feb	TAP
09 Jan - 23 Jan	TAP
31 Jan - 09 Feb	SWISS
05 Jan - 31 Jan	SWISS
12 Jan - 07 Feb	SWISS
10 Jan - 24 Jan	SWISS
09 Jan - 26 Jan	SWISS
22 Jan - 05 Feb	SWISS
09 Jan - 24 Jan	SWISS
22 Jan - 01 Feb	Alaska Airlines
22 Jan - 07 Feb	Flair Airlines
22 Jan - 08 Feb	Flair Airlines
22 Jan - 06 Feb	SWISS
16 Jan - 19 Jan	Alaska Airlines
08 Jan - 31 Jan	SWISS
16 Jan - 20 Jan	TAP
26 Jan - 21 Feb	Aer Lingus

Also check the deals for one-way flights from San Francisco to London in January.

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 January from $474

Return flights