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

Return flights

30 Aug - 11 Sep	Jeju Air
29 Aug - 12 Sep	Jeju Air
30 Aug - 13 Sep	Jeju Air
31 Aug - 07 Sep	Jeju Air
27 Aug - 31 Aug	Jeju Air
29 Aug - 06 Sep	Jeju Air
30 Aug - 06 Sep	Jeju Air
31 Aug - 06 Sep	Jeju Air
27 Aug - 07 Sep	Jeju Air
09 Aug - 16 Aug	VietJet Air
08 Aug - 14 Aug	Jeju Air
22 Aug - 26 Aug	Jeju Air
08 Aug - 11 Aug	Jeju Air
11 Aug - 16 Aug	Jeju Air
05 Aug - 14 Aug	Air China
07 Aug - 10 Aug	Air China
17 Aug - 24 Aug	Air China
08 Aug - 10 Aug	Jeju Air

Also check the deals for one-way flights from Singapore 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 Singapore to Ulaanbaatar in August from $552

Return flights