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

Return flights

04 Dec - 14 Dec	KLM
03 Dec - 14 Dec	KLM
03 Dec - 13 Dec	KLM
13 Dec - 30 Dec	KLM
29 Dec - 12 Jan	Air France
29 Dec - 11 Jan	Air France
28 Dec - 11 Jan	Air France
29 Dec - 10 Jan	British Airways
15 Dec - 05 Jan	Air France
28 Dec - 10 Jan	Air France
29 Dec - 06 Jan	British Airways
28 Dec - 09 Jan	Air France
25 Dec - 08 Jan	Air France
21 Dec - 05 Jan	KLM

Also check the deals for one-way flights from Helsinki 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 Helsinki to San Jose in December from 958€

Return flights