AirHint found the following cheapest return flights from London (LHR) to San Diego (SAN) in December 2026 (see full year).

Return flights

01 Dec - 15 Dec	Lufthansa
05 Dec - 19 Dec	Austrian Airlines
16 Dec - 10 Jan	Lufthansa
24 Dec - 05 Jan	Lufthansa
13 Dec - 27 Dec	Lufthansa
24 Dec - 28 Dec	Lufthansa
16 Dec - 10 Jan	Finnair	direct
27 Dec - 02 Jan	Lufthansa
05 Dec - 19 Dec	Finnair	direct
01 Dec - 15 Dec	British Airways	direct
24 Dec - 28 Dec	Finnair	direct
13 Dec - 27 Dec	British Airways	direct
24 Dec - 05 Jan	British Airways	direct
27 Dec - 02 Jan	Finnair	direct
22 Dec - 05 Jan	Finnair	direct

Also check the deals for one-way flights from London to San Diego 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 London to San Diego in December from 527€

Return flights