AirHint found the following cheapest return flights from San Jose (SJO) to Helsinki (HEL) in December 2025 (see full year).
Return flights
| 31 Dec - 12 Jan | KLM | ||
| 22 Dec - 31 Dec | KLM | ||
| 20 Dec - 28 Dec | Air France | ||
| 16 Dec - 19 Dec | Lufthansa |
Also check the deals for one-way flights from San Jose to Helsinki in December.
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