AirHint found the following cheapest return flights from Sofia (SOF) to Ljubljana (LJU) in December 2025 (see full year).
Return flights
| 01 Dec - 02 Dec | Air Serbia | ||
| 12 Dec - 14 Dec | Air Serbia | ||
| 11 Dec - 14 Dec | Air Serbia | ||
| 05 Dec - 07 Dec | Air Serbia |
Also check the deals for one-way flights from Sofia to Ljubljana in December.
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