AirHint found the following cheapest return flights from Seoul (ICN) to Ulaanbaatar (UBN) in January 2026 (see full year).

Return flights

25 Jan - 29 Jan	Jeju Air	direct
18 Jan - 22 Jan	Jeju Air	direct
15 Jan - 22 Jan	Jeju Air	direct
06 Jan - 25 Jan	Jeju Air	direct
08 Jan - 13 Jan	Jeju Air	direct
15 Jan - 20 Jan	Jeju Air	direct
04 Jan - 11 Jan	Jeju Air	direct
29 Jan - 01 Feb	Jeju Air	direct
03 Jan - 08 Jan	Korean Air	direct
05 Jan - 18 Jan	Korean Air	direct
05 Jan - 17 Jan	Korean Air	direct
29 Jan - 02 Feb	Korean Air	direct

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

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 Seoul to Ulaanbaatar in January from $222

Return flights