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

Return flights

14 Aug - 18 Aug	Air China
06 Aug - 10 Aug	Air China
07 Aug - 10 Aug	Air China
07 Aug - 11 Aug	Air China
08 Aug - 11 Aug	Air China
03 Aug - 06 Aug	Air China
30 Aug - 03 Sep	HK Express
21 Aug - 24 Aug	Air China
16 Aug - 24 Aug	Air China
24 Aug - 02 Sep	Air China
21 Aug - 26 Aug	Air China
02 Aug - 10 Aug	Air China
24 Aug - 02 Sep	Cathay Pacific	direct

Also check the deals for one-way flights from Hong Kong 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 Hong Kong to Ulaanbaatar in August from $407

Return flights