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

Return flights

14 Dec - 24 Dec	Air Canada
14 Dec - 12 Jan	Air Canada
23 Dec - 15 Jan	United
24 Dec - 11 Jan	United
15 Dec - 12 Jan	United
24 Dec - 16 Jan	United
12 Dec - 01 Jan	United
24 Dec - 12 Jan	United
15 Dec - 31 Dec	United
12 Dec - 16 Jan	United
24 Dec - 24 Jan	United
11 Dec - 24 Dec	Lufthansa
12 Dec - 31 Dec	Lufthansa
18 Dec - 31 Dec	Lufthansa
13 Dec - 12 Jan	Air Canada
13 Dec - 31 Dec	Air Canada
23 Dec - 31 Dec	Lufthansa
15 Dec - 29 Dec	Air Canada
13 Dec - 23 Dec	Air Canada
09 Dec - 16 Dec	Icelandair

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 577€

Return flights