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

Return flights

03 Dec - 10 Dec	Lufthansa
01 Dec - 10 Dec	British Airways
08 Dec - 08 Jan	Air Canada
04 Dec - 11 Dec	British Airways	direct
07 Dec - 14 Dec	British Airways	direct
01 Dec - 08 Dec	British Airways
08 Dec - 08 Jan	British Airways	direct
12 Dec - 19 Dec	Lufthansa
11 Dec - 17 Dec	Delta
27 Dec - 10 Jan	British Airways
23 Dec - 30 Dec	Air Canada
24 Dec - 30 Dec	United
05 Dec - 27 Dec	United
24 Dec - 01 Jan	British Airways
17 Dec - 07 Jan	Lufthansa
09 Dec - 03 Jan	Hawaiian Airlines
23 Dec - 04 Jan	Lufthansa
25 Dec - 02 Jan	United
26 Dec - 02 Jan	Lufthansa
26 Dec - 04 Jan	Lufthansa

Also check the deals for one-way flights from San Diego 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 Diego to London in December from 428€

Return flights