Cheapest return flights from Bangkok to Ulaanbaatar in September from 365€

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

Return flights

11 Sep - 28 Sep Thai VietJet Air
07 Sep - 12 Sep T'way Air
08 Sep - 14 Sep T'way Air
22 Sep - 29 Sep T'way Air
09 Sep - 14 Sep T'way Air
02 Sep - 05 Sep T'way Air
29 Sep - 06 Oct T'way Air
11 Sep - 14 Sep Jeju Air
27 Sep - 06 Oct Jin Air
27 Sep - 17 Oct Jin Air
01 Sep - 05 Sep T'way Air
12 Sep - 14 Sep T'way Air
15 Sep - 21 Sep T'way Air

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

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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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