AirHint found the following cheapest return flights from Singapore (SIN) to Ljubljana (LJU) in December 2025 (see full year).
Return flights
| 31 Dec - 07 Jan | Turkish Airlines | ||
| 27 Dec - 30 Dec | Lufthansa | ||
| 25 Dec - 30 Dec | SWISS | ||
| 23 Dec - 27 Dec | SWISS |
Also check the deals for one-way flights from Singapore to Ljubljana in December.
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