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

Return flights

23 Jan - 17 Feb	TAP
19 Jan - 29 Jan	TAP
14 Jan - 21 Jan	TAP
16 Jan - 22 Jan	TAP
24 Jan - 30 Jan	TAP
23 Jan - 01 Feb	TAP
24 Jan - 01 Feb	TAP
21 Jan - 29 Jan	TAP
21 Jan - 30 Jan	TAP
14 Jan - 20 Jan	TAP
24 Jan - 31 Jan	TAP
14 Jan - 17 Jan	TAP
31 Jan - 07 Feb	TAP
28 Jan - 04 Feb	British Airways
20 Jan - 27 Jan	British Airways
29 Jan - 25 Feb	Scandinavian Airlines
29 Jan - 04 Feb	Scandinavian Airlines
29 Jan - 01 Feb	Scandinavian Airlines
25 Jan - 01 Feb	Scandinavian Airlines
29 Jan - 02 Feb	Scandinavian Airlines

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 400€

Return flights