Cheapest return flights from Seoul to Ulaanbaatar in September from $180

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

Return flights

28 Sep - 02 Oct Jeju Air direct
29 Sep - 02 Oct Jeju Air direct
23 Sep - 30 Sep Jeju Air direct
22 Sep - 02 Oct Jeju Air direct
28 Sep - 30 Sep Jeju Air direct
29 Sep - 30 Sep Jeju Air direct
23 Sep - 29 Sep Jeju Air direct
28 Sep - 05 Oct Jeju Air direct
29 Sep - 05 Oct Jeju Air direct
22 Sep - 29 Sep Jeju Air direct
15 Sep - 30 Sep Jeju Air direct
15 Sep - 29 Sep Jeju Air direct
22 Sep - 30 Sep Jeju Air direct
15 Sep - 22 Sep Jeju Air direct
23 Sep - 28 Sep Jeju Air direct
27 Sep - 16 Oct Jeju Air direct
27 Sep - 05 Oct Jeju Air direct
25 Sep - 02 Oct Jeju Air direct
27 Sep - 02 Oct Jeju Air direct
22 Sep - 19 Oct Jeju Air 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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