Cheapest return flights from Seoul to Ulaanbaatar in September from $198

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

Return flights

22 Sep - 28 Sep Jeju Air direct
22 Sep - 30 Sep Jeju Air direct
02 Sep - 08 Sep Jeju Air direct
14 Sep - 21 Sep Jeju Air direct
28 Sep - 30 Sep Jeju Air direct
22 Sep - 27 Sep Jeju Air direct
01 Sep - 13 Sep Jeju Air direct
08 Sep - 13 Sep Jeju Air direct
09 Sep - 13 Sep Jeju Air direct
14 Sep - 20 Sep Jeju Air direct
30 Sep - 05 Oct Jeju Air direct
29 Sep - 02 Oct Jeju Air direct
29 Sep - 14 Oct Jeju Air direct
07 Sep - 31 Oct T'way Air direct
30 Sep - 07 Oct Jeju Air direct
29 Sep - 01 Oct Asiana Airlines direct
30 Sep - 06 Oct Asiana Airlines direct
30 Sep - 15 Oct Asiana Airlines direct
27 Sep - 12 Oct Jeju Air direct
29 Sep - 13 Oct Asiana Airlines direct

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

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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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