AirHint found the following cheapest return flights from Denver (DEN) to Sofia (SOF) in December 2025 (see full year).
Return flights
| 27 Dec - 17 Jan | Lufthansa | ||
| 01 Dec - 27 Dec | United | ||
| 05 Dec - 27 Dec | Lufthansa | ||
| 06 Dec - 02 Jan | Turkish Airlines | ||
| 17 Dec - 27 Dec | Frontier Airlines |
Also check the deals for one-way flights from Denver to Sofia in December.
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