AirHint found the following cheapest return flights from London (LCY) to San Jose (SJO) in December 2025 (see full year).

Return flights

04 Dec - 18 Dec	SWISS
11 Dec - 23 Dec	SWISS
02 Dec - 09 Dec	KLM
09 Dec - 13 Jan	SWISS
04 Dec - 16 Dec	SWISS
04 Dec - 30 Dec	SWISS
02 Dec - 16 Dec	SWISS
02 Dec - 30 Dec	SWISS
01 Dec - 07 Dec	KLM
02 Dec - 29 Dec	KLM
02 Dec - 14 Dec	KLM
24 Dec - 06 Jan	KLM
23 Dec - 01 Jan	SWISS
23 Dec - 03 Jan	SWISS
16 Dec - 06 Jan	SWISS
25 Dec - 11 Jan	KLM
04 Dec - 04 Jan	KLM
12 Dec - 04 Jan	KLM
25 Dec - 06 Jan	KLM
19 Dec - 06 Jan	KLM

Also check the deals for one-way flights from London to San Jose 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 Jose in December from $840

Return flights