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

Return flights

18 Sep - 26 Sep	T'way Air
23 Sep - 26 Sep	T'way Air
27 Sep - 29 Sep	Jeju Air
16 Sep - 19 Sep	T'way Air
24 Sep - 29 Sep	Jeju Air
25 Sep - 29 Sep	Jeju Air
30 Sep - 11 Oct	T'way Air
18 Sep - 21 Sep	T'way Air
20 Sep - 26 Sep	T'way Air
23 Sep - 28 Sep	T'way Air
16 Sep - 21 Sep	T'way Air
27 Sep - 01 Oct	T'way Air
22 Sep - 01 Oct	Asiana Airlines
26 Sep - 01 Oct	Asiana Airlines
21 Sep - 11 Oct	Air China
27 Sep - 03 Oct	Cathay Pacific
26 Sep - 02 Oct	Air China
28 Sep - 02 Oct	Air China
27 Sep - 02 Oct	Air China

Also check the deals for one-way flights from Tokyo 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 Tokyo to Ulaanbaatar in September from $329

Return flights