Cheapest return flights from Seoul to Ulaanbaatar in December from $153

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

Return flights

02 Dec - 14 Dec Jeju Air direct
02 Dec - 09 Dec Jeju Air direct
16 Dec - 21 Dec Jeju Air direct
04 Dec - 14 Dec Jeju Air direct
02 Dec - 04 Dec Jeju Air direct
18 Dec - 21 Dec Jeju Air direct
07 Dec - 21 Dec Jeju Air direct
04 Dec - 09 Dec Jeju Air direct
02 Dec - 07 Dec Jeju Air direct
02 Dec - 16 Dec Jeju Air direct
23 Dec - 13 Jan Jeju Air direct
23 Dec - 06 Jan Jeju Air direct
19 Dec - 03 Jan Air China
19 Dec - 16 Jan Korean Air direct
24 Dec - 03 Jan Korean Air direct
17 Dec - 01 Jan Korean Air direct
18 Dec - 01 Jan Korean Air direct
18 Dec - 02 Jan Korean Air direct
19 Dec - 01 Jan Korean Air direct
19 Dec - 02 Jan 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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