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

Return flights

02 Dec - 08 Dec	SWISS
02 Dec - 16 Dec	SWISS
09 Dec - 16 Dec	Air Canada
03 Dec - 09 Dec	Air Canada
06 Dec - 16 Dec	Air Canada
05 Dec - 23 Dec	Air Canada
04 Dec - 26 Jan	Air Canada
02 Dec - 11 Dec	SWISS
04 Dec - 08 Dec	Air Canada
04 Dec - 16 Dec	Air Canada
04 Dec - 09 Dec	Air Canada
11 Dec - 27 Jan	Lufthansa
02 Dec - 24 Jan	SWISS
11 Dec - 08 Jan	Lufthansa
29 Dec - 08 Jan	Lufthansa
31 Dec - 18 Jan	Austrian Airlines
29 Dec - 18 Jan	Lufthansa
31 Dec - 15 Jan	Lufthansa
29 Dec - 14 Jan	Lufthansa
31 Dec - 14 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 489€

Return flights