AirHint found the following cheapest return flights from Ulaanbaatar (UBN) to Chicago (ORD) in December 2025 (see full year).
Return flights
| 30 Dec - 06 Jan | Turkish Airlines | ||
| 24 Dec - 31 Dec | Korean Air | ||
| 15 Dec - 03 Jan | China United Airlines | ||
| 01 Dec - 08 Dec | Korean Air | ||
| 31 Dec - 07 Jan | Korean Air |
Also check the deals for one-way flights from Ulaanbaatar to Chicago in December.
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