Cheapest return flights from Seoul to Ulaanbaatar in September from 392€
AirHint found the following cheapest return flights from Seoul (ICN) to Ulaanbaatar (UBN) in September 2025 (see full year).
Return flights
| 17 Sep - 20 Sep | MIAT Mongolian Airlines | direct | |
| 17 Sep - 25 Sep | Korean Air | direct | |
| 27 Sep - 13 Oct | Korean Air | direct |
Also check the deals for one-way 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.
