AirHint found the following cheapest return flights from Chicago (MDW) to Sofia (SOF) in December 2025 (see full year).
Return flights
| 30 Dec - 11 Jan | Frontier Airlines | ||
| 28 Dec - 15 Jan | Frontier Airlines | ||
| 28 Dec - 11 Jan | KLM | ||
| 23 Dec - 15 Jan | Frontier Airlines | ||
| 24 Dec - 04 Jan | KLM | ||
| 23 Dec - 04 Jan | KLM |
Also check the deals for one-way flights from Chicago to Sofia in December.
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