AirHint found the following cheapest return flights from Washington (IAD) to Sofia (SOF) in April 2026 (see full year).
Return flights
| 01 Apr - 15 Apr | United | ||
| 07 Apr - 24 May | Lufthansa | ||
| 08 Apr - 24 May | Lufthansa | ||
| 10 Apr - 24 May | Lufthansa | ||
| 09 Apr - 24 May | Lufthansa |
Also check the deals for one-way flights from Washington to Sofia in April.
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