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

Return flights

24 Sep - 28 Sep	Xiamen Airlines
25 Sep - 28 Sep	Jetstar
13 Sep - 20 Sep	Cathay Pacific
23 Sep - 08 Oct	Cathay Pacific
24 Sep - 06 Oct	Cathay Pacific
23 Sep - 06 Oct	Cathay Pacific
23 Sep - 07 Oct	Cathay Pacific
24 Sep - 05 Oct	Cathay Pacific
23 Sep - 03 Oct	Cathay Pacific
23 Sep - 05 Oct	Cathay Pacific
24 Sep - 04 Oct	Air China

Also check the deals for one-way flights from Melbourne 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 Melbourne to Ulaanbaatar in September from $1083

Return flights