Cheapest return flights from Seoul to Ulaanbaatar in September from 145€

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

Return flights

29 Sep - 02 Oct Jeju Air direct
28 Sep - 02 Oct Jeju Air direct
23 Sep - 02 Oct Jeju Air direct
07 Sep - 22 Sep Jeju Air direct
27 Sep - 02 Oct Jeju Air direct
28 Sep - 30 Sep Jeju Air direct
23 Sep - 30 Sep Jeju Air direct
21 Sep - 02 Oct Jeju Air direct
29 Sep - 30 Sep Jeju Air direct
22 Sep - 29 Sep Jeju Air direct
28 Sep - 05 Oct Jeju Air direct
29 Sep - 05 Oct Jeju Air direct
27 Sep - 30 Sep Jeju Air direct
14 Sep - 22 Sep Jeju Air direct
16 Sep - 22 Sep Jeju Air direct
22 Sep - 30 Sep Jeju Air direct
21 Sep - 30 Sep Jeju Air direct
21 Sep - 05 Oct Jeju Air direct
27 Sep - 16 Oct Jeju Air direct
30 Sep - 02 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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