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

Return flights

05 Dec - 12 Dec	Air Canada
06 Dec - 09 Dec	Air Canada
02 Dec - 08 Dec	Air Canada
09 Dec - 25 Dec	Air Canada
02 Dec - 09 Dec	Air Canada
09 Dec - 13 Jan	Air Canada
02 Dec - 11 Dec	Air Canada
02 Dec - 30 Dec	Air Canada
06 Dec - 30 Dec	Air Canada
01 Dec - 11 Dec	Air Canada
09 Dec - 17 Dec	Air Canada
08 Dec - 16 Jan	Air Canada
30 Dec - 13 Jan	Air Canada
08 Dec - 12 Jan	Air France
29 Dec - 18 Jan	United
29 Dec - 17 Jan	United
27 Dec - 15 Jan	United
27 Dec - 18 Jan	United
27 Dec - 17 Jan	United
28 Dec - 18 Jan	United

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 $723

Return flights