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

Return flights

07 Dec - 23 Dec	Austrian Airlines
08 Dec - 16 Dec	Lufthansa
06 Dec - 14 Dec	TAP
03 Dec - 11 Dec	SWISS
04 Dec - 11 Dec	Virgin Atlantic	direct
05 Dec - 10 Dec	Virgin Atlantic	direct
01 Dec - 09 Dec	Virgin Atlantic	direct
02 Dec - 09 Dec	Virgin Atlantic	direct
02 Dec - 10 Dec	Lufthansa
03 Dec - 10 Dec	Lufthansa
30 Dec - 09 Jan	Delta
28 Dec - 17 Jan	Delta
10 Dec - 10 Jan	Lufthansa
30 Dec - 08 Jan	Air Canada
10 Dec - 07 Jan	Air Canada
09 Dec - 07 Jan	Air Canada
30 Dec - 07 Jan	Air Canada
10 Dec - 12 Jan	Air France	direct
13 Dec - 11 Jan	Lufthansa
28 Dec - 17 Jan	British Airways	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 459€

Return flights