AirHint found the following cheapest return flights from Bilbao (BIO) to Keflavik (KEF) in December 2025 (see full year).
Return flights
| 29 Dec - 05 Jan | Vueling Airlines | ||
| 27 Dec - 06 Jan | Vueling Airlines | ||
| 26 Dec - 05 Jan | Air Europa |
Also check the deals for one-way flights from Bilbao to Keflavik in December.
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