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

Return flights

02 Dec - 09 Dec	MIAT Mongolian Airlines
02 Dec - 09 Dec	MIAT Mongolian Airlines	direct
13 Dec - 03 Jan	VietJet Air
18 Dec - 25 Dec	Jeju Air
07 Dec - 13 Dec	Air China
04 Dec - 13 Dec	Air China
06 Dec - 15 Dec	Air China
06 Dec - 13 Dec	Air China
05 Dec - 15 Dec	Air China
02 Dec - 20 Dec	Air China
20 Dec - 26 Dec	Air China

Also check the deals for one-way flights from Singapore to Ulaanbaatar in December.

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 December from $594

Return flights