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

Return flights

28 Dec - 11 Jan	United
23 Dec - 13 Jan	Lufthansa
08 Dec - 15 Dec	United
05 Dec - 07 Dec	United
05 Dec - 07 Dec	British Airways	direct
27 Dec - 11 Jan	United
28 Dec - 11 Jan	British Airways	direct
27 Dec - 10 Jan	United
15 Dec - 26 Dec	United
16 Dec - 30 Dec	Lufthansa
27 Dec - 11 Jan	British Airways	direct
23 Dec - 13 Jan	British Airways	direct
16 Dec - 04 Jan	Lufthansa
19 Dec - 05 Jan	Air Canada
18 Dec - 16 Jan	United
18 Dec - 25 Dec	United
18 Dec - 25 Dec	British Airways	direct
19 Dec - 29 Dec	Delta

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 609€

Return flights