Cheapest return flights from Seoul to Ulaanbaatar in December from $471

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

Return flights

03 Dec - 10 Dec Air China
10 Dec - 14 Dec Air China
05 Dec - 09 Dec Air China
28 Dec - 31 Dec Air China
15 Dec - 18 Dec Air China
01 Dec - 05 Dec Air China
31 Dec - 05 Jan Air China
28 Dec - 03 Jan Air China
12 Dec - 15 Dec Air China
15 Dec - 19 Dec Air China
31 Dec - 04 Jan Air China

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

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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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