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

Return flights

13 Jan - 03 Feb	SWISS
15 Jan - 05 Feb	SWISS
11 Jan - 31 Jan	SWISS
12 Jan - 27 Jan	SWISS
22 Jan - 28 Feb	SWISS
20 Jan - 30 Jan	SWISS
26 Jan - 09 Feb	SWISS
21 Jan - 31 Jan	SWISS
13 Jan - 27 Jan	SWISS
16 Jan - 25 Jan	SWISS
27 Jan - 05 Feb	SWISS
19 Jan - 02 Feb	SWISS
13 Jan - 24 Jan	SWISS
18 Jan - 25 Jan	Aer Lingus
16 Jan - 23 Jan	Aer Lingus
09 Jan - 16 Jan	Aer Lingus
27 Jan - 01 Feb	SWISS
27 Jan - 03 Feb	Air Canada
13 Jan - 04 Feb	SWISS
28 Jan - 14 Feb	SWISS

Also check the deals for one-way flights from London to San Francisco 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 London to San Francisco in January from 312€

Return flights