Cheapest return flights from Seoul to Ulaanbaatar in September from $232

Best time to book flights for Seoul (ICN) to Ulaanbaatar (UBN) flights at AirHint

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

Return flights

01 Sep - 29 Sep Jeju Air direct
08 Sep - 13 Sep Jeju Air direct
29 Sep - 02 Oct Jeju Air direct
14 Sep - 30 Sep Jeju Air direct
08 Sep - 15 Sep Jeju Air direct
08 Sep - 11 Sep Jeju Air direct
06 Sep - 13 Sep Jeju Air direct
25 Sep - 28 Sep Jeju Air direct
22 Sep - 29 Sep Jeju Air direct
01 Sep - 30 Sep Jeju Air direct
13 Sep - 20 Sep Jeju Air direct
28 Sep - 05 Oct Jeju Air direct
22 Sep - 07 Oct Jeju Air
14 Sep - 01 Oct Jeju Air direct
27 Sep - 06 Oct Korean Air direct
29 Sep - 06 Oct Korean Air direct
26 Sep - 06 Oct Korean Air direct
22 Sep - 07 Oct Jeju Air direct
27 Sep - 12 Oct Jeju Air direct
29 Sep - 04 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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