AirHint found the following cheapest return flights from Boston (BOS) to Sofia (SOF) in January 2026 (see full year).
Return flights
| 28 Jan - 04 Feb | SWISS | ||
| 27 Jan - 04 Feb | Lufthansa | ||
| 06 Jan - 20 Jan | Lufthansa | ||
| 12 Jan - 26 Jan | Lufthansa | ||
| 15 Jan - 29 Jan | Lufthansa | ||
| 02 Jan - 15 Feb | Austrian Airlines |
Also check the deals for one-way flights from Boston to Sofia in January.
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