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	British Airways
08 Dec - 23 Dec	British Airways	direct
02 Dec - 16 Dec	Delta
08 Dec - 15 Dec	British Airways
11 Dec - 15 Dec	British Airways
01 Dec - 05 Dec	British Airways	direct
02 Dec - 05 Dec	British Airways	direct
13 Dec - 20 Dec	United
23 Dec - 30 Dec	Lufthansa
01 Dec - 01 Jan	Delta
18 Dec - 25 Dec	British Airways
24 Dec - 03 Jan	Lufthansa
23 Dec - 05 Jan	United
22 Dec - 02 Jan	Delta
27 Dec - 03 Jan	Delta
23 Dec - 03 Jan	Delta
21 Dec - 04 Jan	Delta
01 Dec - 01 Jan	British Airways	direct
23 Dec - 05 Jan	British Airways	direct
23 Dec - 03 Jan	British Airways	direct

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 474€

Return flights