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

Return flights

02 Dec - 07 Dec	Air Canada
06 Dec - 15 Dec	Air Canada
02 Dec - 13 Dec	SWISS
04 Dec - 17 Dec	SWISS
05 Dec - 15 Dec	SWISS
06 Dec - 14 Dec	Air Canada
04 Dec - 15 Dec	SWISS
02 Dec - 16 Dec	Air Canada
06 Dec - 16 Dec	Air Canada
06 Dec - 12 Dec	Air Canada
09 Dec - 13 Jan	Air Canada
11 Dec - 13 Jan	Air Canada
15 Dec - 12 Jan	Brussels Airlines
16 Dec - 13 Jan	Air Canada
30 Dec - 13 Jan	Lufthansa
31 Dec - 31 Jan	United
30 Dec - 10 Jan	Lufthansa
23 Dec - 14 Jan	Brussels Airlines
25 Dec - 15 Jan	American Airlines
26 Dec - 17 Jan	American Airlines

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 631€

Return flights