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

Return flights

31 Jan - 07 Feb	TAP
31 Jan - 04 Feb	Aer Lingus
31 Jan - 03 Feb	Aer Lingus
31 Jan - 10 Feb	United	direct
31 Jan - 09 Feb	Aer Lingus
31 Jan - 07 Feb	Air France	direct
31 Jan - 08 Feb	Air France	direct
31 Jan - 09 Feb	Delta	direct
31 Jan - 04 Feb	British Airways	direct
31 Jan - 03 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 $478

Return flights