AirHint found the following cheapest return flights from Washington (IAD) to Sofia (SOF) in May 2026 (see full year).
Return flights
| 06 May - 13 May | Lufthansa | ||
| 11 May - 25 May | SWISS | ||
| 08 May - 22 May | Lufthansa | ||
| 01 May - 24 May | Lufthansa | ||
| 22 May - 27 May | United |
Also check the deals for one-way flights from Washington to Sofia in May.
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