AirHint found the following cheapest return flights from Chicago (ORD) to Sofia (SOF) in April 2026 (see full year).
Return flights
| 21 Apr - 05 May | Turkish Airlines | ||
| 03 Apr - 30 Apr | Turkish Airlines | ||
| 24 Apr - 08 May | Turkish Airlines | ||
| 30 Apr - 04 May | Turkish Airlines | ||
| 06 Apr - 12 Apr | LOT | ||
| 06 Apr - 11 Apr | Turkish Airlines |
Also check the deals for one-way flights from Chicago to Sofia in April.
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