AirHint found the following cheapest return flights from Zagreb (ZAG) to Ljubljana (LJU) in December 2025 (see full year).
Return flights
| 20 Dec - 05 Jan | Lufthansa | ||
| 26 Dec - 10 Jan | Air Serbia | ||
| 07 Dec - 14 Dec | Ryanair | ||
| 10 Dec - 12 Dec | Lufthansa | ||
| 30 Dec - 03 Jan | Lufthansa |
Also check the deals for one-way flights from Zagreb to Ljubljana in December.
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