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

Return flights

17 Dec - 04 Jan	WestJet
13 Dec - 19 Dec	Icelandair
17 Dec - 03 Jan	WestJet
23 Dec - 27 Dec	Sun Country Airlines
12 Dec - 20 Dec	Icelandair
22 Dec - 26 Dec	WestJet
26 Dec - 03 Jan	Alaska Airlines
20 Dec - 03 Jan	Alaska Airlines
29 Dec - 02 Jan	Alaska Airlines

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 $1102

Return flights