AirHint found the following cheapest return flights from Sydney (SYD) to Ulaanbaatar (UBN) in August 2025 (see full year).

Return flights

06 Aug - 18 Aug	Air China
06 Aug - 13 Aug	Air China
01 Aug - 08 Aug	Air China
14 Aug - 23 Aug	Air China
13 Aug - 05 Sep	Air China
01 Aug - 15 Aug	Air China
01 Aug - 29 Aug	Air China
17 Aug - 24 Aug	AirAsia X
16 Aug - 29 Aug	Air China
26 Aug - 16 Sep	Cathay Pacific
27 Aug - 16 Sep	Cathay Pacific
04 Aug - 04 Sep	Cathay Pacific
01 Aug - 03 Aug	Cathay Pacific
09 Aug - 16 Aug	Cathay Pacific

Also check the deals for one-way flights from Sydney to Ulaanbaatar in August.

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 Sydney to Ulaanbaatar in August from 709€

Return flights