AirHint found the following cheapest return flights from Cardiff (CWL) to Helsinki (HEL) in December 2025 (see full year).
Return flights
| 04 Dec - 10 Dec | Ryanair | ||
| 11 Dec - 16 Dec | KLM | ||
| 17 Dec - 23 Dec | Ryanair | ||
| 26 Dec - 02 Jan | KLM |
Also check the deals for one-way flights from Cardiff to Helsinki in December.
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