AirHint found the following cheapest return flights from Singapore (SIN) to Sofia (SOF) in December 2025 (see full year).
Return flights
| 07 Dec - 14 Dec | Hainan Airlines | ||
| 07 Dec - 10 Jan | Lufthansa | ||
| 01 Dec - 14 Dec | Etihad Airways | ||
| 06 Dec - 13 Dec | KLM | ||
| 11 Dec - 19 Dec | Etihad Airways | ||
| 24 Dec - 03 Jan | Emirates |
Also check the deals for one-way flights from Singapore to Sofia in December.
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