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	Air China
04 Aug - 11 Aug	Air China
01 Aug - 23 Aug	Air China
08 Aug - 30 Aug	Air China
16 Aug - 30 Aug	Air China
07 Aug - 30 Aug	Air China
06 Aug - 13 Aug	Air China
14 Aug - 23 Aug	Air China
01 Aug - 30 Aug	Air China
15 Aug - 25 Aug	Air China
19 Aug - 16 Sep	Cathay Pacific
26 Aug - 23 Sep	Qantas
26 Aug - 09 Sep	Qantas
25 Aug - 02 Sep	Cathay Pacific
22 Aug - 12 Sep	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 733€

Return flights