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

Return flights

30 Dec - 06 Jan	Air China
31 Dec - 04 Jan	Air China
28 Dec - 02 Jan	Air China
02 Dec - 06 Dec	Air China
05 Dec - 10 Dec	Air China
27 Dec - 06 Jan	Cathay Pacific
23 Dec - 27 Dec	Air China
30 Dec - 03 Jan	Air China
06 Dec - 14 Dec	Air China
02 Dec - 09 Dec	Air China
20 Dec - 28 Dec	Air China
19 Dec - 26 Dec	Air China
10 Dec - 19 Dec	Air China
23 Dec - 30 Dec	Cathay Pacific
24 Dec - 01 Jan	Cathay Pacific
23 Dec - 03 Jan	Air China
07 Dec - 23 Dec	Jeju Air

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 592€

Return flights