Cheapest return flights from Seoul to Ulaanbaatar in September from $262

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 - 13 Sep Jeju Air direct
01 Sep - 05 Sep T'way Air direct
23 Sep - 21 Oct Jeju Air direct
21 Sep - 25 Sep Jeju Air direct
08 Sep - 14 Sep Jeju Air direct
01 Sep - 07 Sep Jeju Air direct
13 Sep - 18 Sep Jeju Air direct
14 Sep - 17 Sep T'way Air direct
22 Sep - 26 Sep T'way Air direct
15 Sep - 19 Sep T'way Air direct
07 Sep - 10 Sep T'way Air direct
28 Sep - 01 Oct Korean Air direct
24 Sep - 03 Oct Korean Air direct
29 Sep - 05 Oct Korean Air direct
28 Sep - 06 Oct Korean Air direct
23 Sep - 03 Oct Korean Air direct
22 Sep - 20 Oct Korean Air direct
26 Sep - 12 Oct Korean Air direct
30 Sep - 06 Oct Air China
30 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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