AirHint found the following cheapest return flights from Boston (BOS) to Sofia (SOF) in August 2026 (see full year).
Return flights
| 18 Aug - 01 Sep | Air France | ||
| 13 Aug - 08 Sep | Lufthansa | ||
| 01 Aug - 02 Sep | Lufthansa | ||
| 21 Aug - 04 Sep | Air France | ||
| 04 Aug - 14 Aug | Lufthansa |
Also check the deals for one-way flights from Boston to Sofia in August.
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