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

Return flights

07 Jan - 25 Jan	TAP
05 Jan - 13 Jan	TAP
06 Jan - 03 Feb	Air Canada
20 Jan - 03 Feb	Air Canada
05 Jan - 12 Jan	Air Canada
14 Jan - 21 Jan	Aer Lingus
05 Jan - 21 Jan	United
21 Jan - 28 Jan	United
14 Jan - 21 Jan	Finnair	direct
05 Jan - 21 Jan	British Airways	direct
21 Jan - 28 Jan	British Airways	direct
20 Jan - 03 Feb	British Airways	direct
05 Jan - 13 Jan	British Airways	direct
06 Jan - 03 Feb	British Airways	direct
31 Jan - 07 Feb	United
31 Jan - 07 Feb	British Airways	direct

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 $530

Return flights