AirHint found the following cheapest one-way flights from Chicago (ORD) to Bucharest (OTP) in December 2025 (see full year).
One-Way flights
| 27 Dec | Air Serbia | ||
| 26 Dec | Austrian Airlines | ||
| 17 Dec | Icelandair | ||
| 22 Dec | Spirit Airlines | ||
| 21 Dec | Frontier Airlines |
Also check the deals for return flights from Chicago to Bucharest in December.
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