AirHint found the following cheapest return flights from San Francisco (SFO) to London (LHR) in December 2025 (see full year).

Return flights

01 Dec - 07 Dec	TAP
05 Dec - 14 Dec	TAP
01 Dec - 11 Dec	TAP
03 Dec - 16 Dec	TAP
08 Dec - 12 Dec	Scandinavian Airlines
02 Dec - 12 Dec	Virgin Atlantic
06 Dec - 14 Dec	TAP
08 Dec - 15 Dec	TAP
05 Dec - 15 Dec	TAP
08 Dec - 13 Jan	TAP
03 Dec - 13 Jan	TAP
11 Dec - 25 Dec	Lufthansa
29 Dec - 12 Jan	Lufthansa
10 Dec - 13 Jan	Lufthansa
09 Dec - 11 Jan	Scandinavian Airlines
29 Dec - 19 Jan	Lufthansa
03 Dec - 11 Jan	TAP
29 Dec - 24 Jan	Lufthansa
31 Dec - 20 Jan	Delta
02 Dec - 13 Jan	Delta	direct

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

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 December from 385€

Return flights