AirHint found the following cheapest return flights from Cologne (CGN) to Ljubljana (LJU) in December 2025 (see full year).
Return flights
| 05 Dec - 08 Dec | Lufthansa | ||
| 18 Dec - 04 Jan | Lufthansa | ||
| 20 Dec - 30 Dec | Lufthansa | ||
| 29 Dec - 03 Jan | Lufthansa | ||
| 06 Dec - 07 Dec | Air Serbia |
Also check the deals for one-way flights from Cologne to Ljubljana in December.
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