AirHint found the following cheapest return flights from Billund (BLL) to Porto (OPO) in December 2025 (see full year).
Return flights
| 05 Dec - 07 Dec | Lufthansa | ||
| 29 Dec - 02 Jan | KLM | ||
| 30 Dec - 02 Jan | KLM | ||
| 22 Dec - 26 Dec | KLM | ||
| 28 Dec - 02 Jan | KLM | ||
| 26 Dec - 02 Jan | Scandinavian Airlines | ||
| 21 Dec - 02 Jan | KLM |
Also check the deals for one-way flights from Billund to Porto in December.
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