AirHint found the following cheapest return flights from Hanoi (HAN) to Ulaanbaatar (UBN) in December 2025 (see full year).
Return flights
| 23 Dec - 30 Dec | Aero Mongolia | ||
| 26 Dec - 02 Jan | Aero Mongolia | direct | |
| 04 Dec - 11 Dec | Cathay Pacific | ||
| 06 Dec - 17 Dec | Korean Air |
Also check the deals for one-way flights from Hanoi to Ulaanbaatar in December.
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