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

Return flights

01 Dec - 11 Dec	TAP
02 Dec - 16 Dec	Virgin Atlantic
02 Dec - 16 Dec	Delta	direct
09 Dec - 16 Dec	Delta	direct
01 Dec - 11 Dec	British Airways	direct
10 Dec - 23 Dec	Virgin Atlantic
08 Dec - 06 Jan	Air Canada
15 Dec - 22 Dec	Air Canada
08 Dec - 15 Dec	British Airways	direct
04 Dec - 17 Dec	Lufthansa
10 Dec - 23 Dec	Delta	direct
16 Dec - 15 Jan	Delta	direct
31 Dec - 14 Jan	United
30 Dec - 30 Jan	United
30 Dec - 30 Jan	Virgin Atlantic	direct
31 Dec - 14 Jan	British Airways	direct
23 Dec - 09 Jan	United
30 Dec - 06 Jan	SWISS
25 Dec - 01 Jan	Lufthansa
17 Dec - 13 Jan	American Airlines

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from San Francisco to London in December from 387€

Return flights