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

Return flights

30 Dec - 13 Jan	Lufthansa
30 Dec - 09 Jan	Lufthansa
08 Dec - 30 Jan	British Airways
30 Dec - 14 Jan	Delta
30 Dec - 12 Jan	Lufthansa
11 Dec - 18 Dec	Delta
29 Dec - 12 Jan	Lufthansa
02 Dec - 09 Dec	Austrian Airlines
12 Dec - 19 Dec	KLM
14 Dec - 14 Jan	British Airways
24 Dec - 14 Jan	KLM
24 Dec - 10 Jan	Air Canada
10 Dec - 17 Dec	Delta
12 Dec - 26 Dec	Air Canada
24 Dec - 12 Jan	KLM
01 Dec - 08 Dec	jetBlue
09 Dec - 30 Dec	British Airways
12 Dec - 21 Dec	Delta
15 Dec - 26 Dec	Iberia
12 Dec - 20 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 479€

Return flights