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

Return flights

02 Dec - 22 Dec	SWISS
04 Dec - 23 Dec	SWISS
06 Dec - 16 Dec	SWISS
02 Dec - 16 Dec	SWISS
05 Dec - 14 Dec	SWISS
04 Dec - 14 Dec	SWISS
01 Dec - 15 Dec	SWISS
04 Dec - 11 Dec	SWISS
11 Dec - 29 Jan	SWISS
06 Dec - 13 Dec	SWISS
04 Dec - 26 Jan	Delta
10 Dec - 16 Dec	SWISS
30 Dec - 13 Jan	SWISS
11 Dec - 08 Jan	SWISS
29 Dec - 14 Jan	Lufthansa
30 Dec - 15 Jan	KLM
31 Dec - 14 Jan	SWISS
31 Dec - 11 Jan	KLM
26 Dec - 14 Jan	Iberia
28 Dec - 12 Jan	SWISS

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 738€

Return flights