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

Return flights

25 Sep - 20 Oct	T'way Air
22 Sep - 30 Sep	Spring Airlines Japan
22 Sep - 24 Sep	Spring Airlines Japan
21 Sep - 29 Sep	Jeju Air
25 Sep - 29 Sep	Jeju Air
25 Sep - 02 Oct	T'way Air
27 Sep - 04 Oct	T'way Air
26 Sep - 20 Oct	Jetstar Japan
24 Sep - 28 Sep	Jeju Air
25 Sep - 28 Sep	Jeju Air
26 Sep - 29 Sep	Jeju Air
29 Sep - 05 Oct	MIAT Mongolian Airlines
21 Sep - 22 Sep	Jeju Air
23 Sep - 26 Sep	T'way Air
28 Sep - 12 Oct	T'way Air
25 Sep - 03 Oct	T'way Air
22 Sep - 26 Sep	Jeju Air
29 Sep - 01 Oct	Asiana Airlines
21 Sep - 25 Oct	Korean Air
21 Sep - 01 Oct	Asiana Airlines

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 274€

Return flights