AirHint found the following cheapest one-way flights from Seoul (GMP) to Ulaanbaatar (UBN) in September 2025 (see full year).
One-Way flights
| 10 Sep | Jeju Air | ||
| 11 Sep | Air Busan | ||
| 06 Sep | Air Busan | ||
| 05 Sep | Jeju Air | ||
| 03 Sep | Jin Air | ||
| 15 Sep | Jin Air | ||
| 28 Sep | Air Busan | ||
| 25 Sep | Air Busan | ||
| 26 Sep | Jin Air | ||
| 09 Sep | Air Busan |
Also check the deals for return flights from Seoul to Ulaanbaatar in September.
The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
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