Cheapest return flights from Seoul to Ulaanbaatar in December from $295

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

Return flights

27 Dec - 15 Jan Asiana Airlines direct
31 Dec - 22 Jan Asiana Airlines direct
31 Dec - 15 Jan Asiana Airlines direct
30 Dec - 20 Jan Jeju Air direct
30 Dec - 27 Jan Jeju Air direct
25 Dec - 31 Dec Aero Mongolia direct
23 Dec - 18 Jan Jeju Air direct
22 Dec - 18 Jan Korean Air direct
28 Dec - 15 Jan Jeju Air direct
31 Dec - 24 Jan Korean Air direct
26 Dec - 31 Dec MIAT Mongolian Airlines direct
31 Dec - 06 Jan Asiana Airlines direct
22 Dec - 27 Dec Aero Mongolia direct
25 Dec - 30 Dec MIAT Mongolian Airlines direct
22 Dec - 31 Dec Korean Air direct
22 Dec - 26 Dec MIAT Mongolian Airlines direct
26 Dec - 28 Dec MIAT Mongolian Airlines direct
27 Dec - 29 Dec Aero Mongolia direct
23 Dec - 26 Dec MIAT Mongolian Airlines direct
28 Dec - 31 Dec Korean Air direct

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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