Cheapest one-way flights from Seoul to Ulaanbaatar in December from $103

AirHint found the following cheapest one-way flights from Seoul (ICN) to Ulaanbaatar (UBN) in December 2025 (see full year).

One-Way flights

04 Dec Jeju Air direct
09 Dec Jeju Air direct
23 Dec Jeju Air direct
11 Dec Jeju Air direct
07 Dec Jeju Air direct
14 Dec Jeju Air direct
01 Dec Air China
12 Dec Air China
13 Dec Air China
20 Dec Air China

Also check the deals for return flights from Seoul to Ulaanbaatar in December.

Skyscanner

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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