AirHint found the following cheapest return flights from Ulaanbaatar (UBN) to Singapore (SIN) in December 2025 (see full year).
Return flights
| 06 Dec - 13 Dec | MIAT Mongolian Airlines | ||
| 06 Dec - 13 Dec | MIAT Mongolian Airlines | direct | |
| 02 Dec - 30 Dec | Jeju Air | ||
| 25 Dec - 31 Dec | Cathay Pacific |
Also check the deals for one-way flights from Ulaanbaatar to Singapore in December.
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