AirHint found the following cheapest return flights from Ljubljana (LJU) to Keflavik (KEF) in December 2025 (see full year).
Return flights
| 11 Dec - 13 Dec | easyJet | ||
| 24 Dec - 04 Jan | KLM | ||
| 28 Dec - 03 Jan | Air Serbia |
Also check the deals for one-way flights from Ljubljana to Keflavik in December.
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