Cheapest return flights from Bangkok to Ulaanbaatar in September from $538

Best time to book flights for Bangkok (BKK) to Ulaanbaatar (UBN) flights at AirHint

AirHint found the following cheapest return flights from Bangkok (BKK) to Ulaanbaatar (UBN) in September 2025 (see full year).

Return flights

10 Sep - 15 Sep T'way Air
10 Sep - 20 Sep Air Busan
08 Sep - 12 Sep T'way Air
24 Sep - 26 Sep T'way Air
03 Sep - 08 Sep T'way Air
24 Sep - 27 Sep Jeju Air
05 Sep - 07 Sep T'way Air
29 Sep - 06 Oct Cathay Pacific
12 Sep - 18 Sep Korean Air

Also check the deals for one-way flights from Bangkok to Ulaanbaatar in September.

Skyscanner

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.

Book a cheap hotel in Ulaanbaatar

Cheap car rent in Ulaanbaatar