Cheapest return flights from Seoul to Ulaanbaatar in September from 203€

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

Return flights

28 Sep - 30 Sep Jeju Air direct
23 Sep - 25 Sep Jeju Air direct
23 Sep - 27 Sep Jeju Air direct
22 Sep - 30 Sep Jeju Air direct
29 Sep - 14 Oct Jeju Air direct
22 Sep - 27 Sep Jeju Air direct
22 Sep - 25 Sep Jeju Air direct
28 Sep - 05 Oct Jeju Air direct
29 Sep - 28 Oct Jeju Air direct
22 Sep - 26 Sep T'way Air direct
28 Sep - 02 Oct Jeju Air direct
21 Sep - 26 Sep T'way Air direct
14 Sep - 18 Sep Jeju Air direct
15 Sep - 20 Sep Jeju Air direct
30 Sep - 05 Oct Jeju Air direct
30 Sep - 14 Oct Jeju Air direct
22 Sep - 07 Oct Jeju Air direct
28 Sep - 07 Oct Jeju Air direct
08 Sep - 02 Oct Jeju Air direct
22 Sep - 20 Oct Air China

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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