AirHint found the following cheapest return flights from Boston (BOS) to Sofia (SOF) in April 2026 (see full year).
Return flights
| 22 Apr - 06 May | Lufthansa | ||
| 01 Apr - 12 Apr | Lufthansa | ||
| 19 Apr - 26 Apr | Lufthansa | ||
| 25 Apr - 09 May | Lufthansa |
Also check the deals for one-way flights from Boston to Sofia in April.
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