AirHint found the following cheapest one-way flights from Chicago (ORD) to Belgrade (BEG) in December 2025 (see full year).
One-Way flights
| 02 Dec | Frontier Airlines | ||
| 31 Dec | Frontier Airlines | ||
| 12 Dec | Austrian Airlines | ||
| 24 Dec | Austrian Airlines | ||
| 24 Dec | Air Serbia | direct | |
| 20 Dec | Air Serbia | direct | |
| 22 Dec | Frontier Airlines |
Also check the deals for return flights from Chicago to Belgrade in December.
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