AirHint found the following cheapest return flights from Trondheim (TRD) to Sofia (SOF) in December 2025 (see full year).
Return flights
| 30 Dec - 05 Jan | Scandinavian Airlines | ||
| 20 Dec - 20 Jan | Scandinavian Airlines | ||
| 28 Dec - 02 Jan | Norwegian | ||
| 26 Dec - 02 Jan | Wizz Air |
Also check the deals for one-way flights from Trondheim to Sofia in December.
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