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

Return flights

02 Dec - 12 Dec	SWISS
02 Dec - 11 Dec	SWISS
05 Dec - 08 Dec	Air Canada
10 Dec - 24 Dec	Lufthansa
04 Dec - 26 Jan	Lufthansa
05 Dec - 23 Dec	Air Canada
03 Dec - 09 Dec	Air Canada
09 Dec - 23 Dec	Air Canada
02 Dec - 08 Dec	Air Canada
02 Dec - 13 Dec	SWISS
04 Dec - 23 Dec	Air Canada
31 Dec - 14 Jan	Lufthansa
31 Dec - 17 Jan	Lufthansa
12 Dec - 16 Jan	Finnair
11 Dec - 27 Jan	Finnair
31 Dec - 15 Jan	United
31 Dec - 16 Jan	United
27 Dec - 20 Jan	Air Canada
28 Dec - 08 Jan	Air Canada
30 Dec - 19 Jan	Air Canada

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 508€

Return flights