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

Return flights

30 Dec - 09 Jan	Lufthansa
29 Dec - 16 Jan	United	direct
29 Dec - 13 Jan	United	direct
29 Dec - 09 Jan	Virgin Atlantic
30 Dec - 10 Jan	Lufthansa
29 Dec - 11 Jan	Virgin Atlantic
28 Dec - 11 Jan	Air Canada
28 Dec - 15 Jan	Lufthansa
30 Dec - 07 Jan	SWISS
27 Dec - 09 Jan	Austrian Airlines
24 Dec - 28 Dec	Lufthansa
25 Dec - 28 Dec	SWISS
26 Dec - 28 Dec	United	direct
24 Dec - 28 Dec	United	direct
25 Dec - 28 Dec	Austrian Airlines	direct
26 Dec - 29 Dec	Lufthansa
23 Dec - 30 Dec	Virgin Atlantic
23 Dec - 29 Dec	Delta
26 Dec - 30 Dec	Delta
24 Dec - 30 Dec	Air France

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 507€

Return flights