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

Return flights

06 Aug - 20 Aug	Jetstar
01 Aug - 29 Aug	Air China
01 Aug - 30 Aug	Air China
06 Aug - 13 Aug	Air China
01 Aug - 08 Aug	Air China
10 Aug - 23 Aug	Air China
14 Aug - 23 Aug	Air China
22 Aug - 29 Aug	VietJet Air
16 Aug - 23 Aug	Air China
01 Aug - 15 Aug	Air China
23 Aug - 20 Sep	Air China
28 Aug - 09 Sep	Cathay Pacific
22 Aug - 21 Sep	Cathay Pacific
02 Aug - 07 Sep	Cathay Pacific
01 Aug - 09 Sep	Cathay Pacific
25 Aug - 01 Sep	Cathay Pacific
23 Aug - 09 Sep	Qantas

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 696€

Return flights