AirHint found the following cheapest return flights from Billund (BLL) to Keflavik (KEF) in December 2025 (see full year).
Return flights
| 18 Dec - 25 Dec | Wizz Air | ||
| 18 Dec - 04 Jan | Wizz Air | ||
| 18 Dec - 03 Jan | Wizz Air | ||
| 17 Dec - 03 Jan | Wizz Air | ||
| 20 Dec - 27 Dec | LOT | ||
| 19 Dec - 26 Dec | Lufthansa | ||
| 19 Dec - 26 Dec | Icelandair | direct |
Also check the deals for one-way flights from Billund to Keflavik in December.
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