AirHint found the following cheapest return flights from Chicago (MDW) to Sofia (SOF) in December 2025 (see full year).
Return flights
| 23 Dec - 17 Jan | Frontier Airlines | ||
| 22 Dec - 17 Jan | Frontier Airlines | ||
| 12 Dec - 04 Jan | Air France | ||
| 19 Dec - 07 Jan | Air France |
Also check the deals for one-way flights from Chicago to Sofia in December.
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