AirHint found the following cheapest return flights from Seoul (ICN) to Ulaanbaatar (UBN) in December 2026 (see full year).
Return flights
| 25 Dec - 02 Jan | Aero Mongolia | direct | |
| 25 Dec - 28 Dec | Korean Air | direct | |
| 31 Dec - 03 Jan | Korean Air | direct | |
| 25 Dec - 30 Dec | Korean Air | direct | |
| 26 Dec - 30 Dec | Korean Air | direct | |
| 25 Dec - 29 Dec | Air China |
Also check the deals for one-way flights from Seoul to Ulaanbaatar in December.
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