AirHint found the following cheapest one-way flights from Bangkok (BKK) to Ulaanbaatar (UBN) in September 2025 (see full year).
One-Way flights
| 27 Sep | T'way Air | ||
| 28 Sep | T'way Air | ||
| 18 Sep | Jeju Air | ||
| 25 Sep | Jeju Air | ||
| 23 Sep | Thai VietJet Air | ||
| 26 Sep | Greater Bay Airlines | ||
| 20 Sep | T'way Air | ||
| 21 Sep | Jeju Air | ||
| 17 Sep | Thai AirAsia | ||
| 22 Sep | HK Express |
Also check the deals for return flights from Bangkok 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.
Find us on social media