Cheapest return flights from Seoul to Ulaanbaatar in September from $247

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

07 Sep - 15 Sep Jeju Air direct
28 Sep - 30 Sep Jeju Air direct
01 Sep - 13 Sep Jeju Air direct
23 Sep - 28 Sep Jeju Air direct
15 Sep - 20 Sep Jeju Air direct
22 Sep - 28 Sep Jeju Air direct
07 Sep - 13 Sep Jeju Air direct
01 Sep - 08 Sep Jeju Air direct
22 Sep - 29 Sep Jeju Air direct
01 Sep - 02 Sep Jeju Air direct
29 Sep - 02 Oct Jeju Air direct
29 Sep - 09 Oct Jeju Air direct
30 Sep - 09 Oct Jeju Air direct
11 Sep - 12 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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