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

Return flights

04 Dec - 07 Dec	SWISS
02 Dec - 16 Dec	SWISS
05 Dec - 12 Dec	SWISS
06 Dec - 09 Dec	Air Canada
02 Dec - 13 Dec	Air Canada
03 Dec - 17 Dec	Air Canada
06 Dec - 16 Dec	Air Canada
06 Dec - 13 Dec	Air Canada
04 Dec - 13 Dec	Air Canada
01 Dec - 11 Dec	Brussels Airlines
29 Dec - 13 Jan	Lufthansa
30 Dec - 15 Jan	Lufthansa
28 Dec - 13 Jan	Lufthansa
28 Dec - 12 Jan	Lufthansa
31 Dec - 10 Jan	Lufthansa
28 Dec - 17 Jan	Lufthansa
28 Dec - 15 Jan	Lufthansa
28 Dec - 10 Jan	Lufthansa
30 Dec - 10 Jan	Lufthansa
27 Dec - 16 Jan	Lufthansa

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 621€

Return flights