AirHint found the following cheapest one-way flights from Chicago (MDW) to Sofia (SOF) in September 2026 (see full year).
One-Way flights
| 14 Sep | KLM | ||
| 12 Sep | KLM | ||
| 15 Sep | KLM | ||
| 13 Sep | KLM |
Also check the deals for return flights from Chicago to Sofia in September.
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