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

Return flights

07 Sep - 20 Sep	Aero K Airlines
20 Sep - 24 Sep	T'way Air
23 Sep - 28 Sep	T'way Air
05 Sep - 10 Sep	Air China
20 Sep - 22 Sep	T'way Air
03 Sep - 10 Sep	Air China
10 Sep - 17 Sep	Air China
07 Sep - 12 Sep	Air China
17 Sep - 22 Sep	Air China
12 Sep - 16 Sep	Air China
20 Sep - 05 Oct	Jeju Air
27 Sep - 01 Oct	T'way Air
20 Sep - 13 Oct	Korean Air

Also check the deals for one-way flights from Osaka 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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Cheapest return flights from Osaka to Ulaanbaatar in September from 247€

Return flights