AirHint found the following cheapest one-way flights from Porto (OPO) to Bilbao (BIO) in December 2025 (see full year).
One-Way flights
| 25 Dec | Volotea | direct | |
| 11 Dec | Volotea | direct | |
| 14 Dec | Volotea | direct | |
| 22 Dec | Iberia | ||
| 31 Dec | Iberia | ||
| 24 Dec | Vueling Airlines | ||
| 16 Dec | Air Europa | ||
| 15 Dec | Air Europa | ||
| 23 Dec | Ryanair | ||
| 17 Dec | Air Europa |
Also check the deals for return flights from Porto to Bilbao in December.
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