AirHint found the following cheapest return flights from Cologne (CGN) to Ljubljana (LJU) in December 2025 (see full year).
Return flights
| 18 Dec - 21 Dec | Lufthansa | ||
| 04 Dec - 08 Dec | Lufthansa | ||
| 17 Dec - 21 Dec | SWISS | ||
| 22 Dec - 02 Jan | Lufthansa |
Also check the deals for one-way flights from Cologne to Ljubljana in December.
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