AirHint found the following cheapest return flights from Sofia (SOF) to Boston (BOS) in December 2025 (see full year).
Return flights
| 24 Dec - 01 Jan | Lufthansa | ||
| 05 Dec - 10 Dec | Ryanair | ||
| 05 Dec - 09 Dec | KLM | ||
| 10 Dec - 15 Dec | Ryanair | ||
| 24 Dec - 27 Dec | Lufthansa |
Also check the deals for one-way flights from Sofia to Boston in December.
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