Cheapest return flights from Seoul to Ulaanbaatar in September from 266€

AirHint found the following cheapest return flights from Seoul (ICN) to Ulaanbaatar (UBN) in September 2026 (see full year).

Return flights

19 Sep - 27 Sep Aero Mongolia direct
01 Sep - 15 Sep Jeju Air direct
01 Sep - 10 Sep Jeju Air direct
22 Sep - 24 Sep Jeju Air direct
03 Sep - 22 Sep Jeju Air direct
26 Sep - 29 Sep Jeju Air direct
08 Sep - 13 Sep Jeju Air direct
05 Sep - 12 Sep Jeju Air direct
19 Sep - 23 Sep Korean Air direct
20 Sep - 23 Sep Korean Air direct
23 Sep - 04 Oct Air China
23 Sep - 04 Oct Asiana Airlines direct

Also check the deals for one-way flights from Seoul to Ulaanbaatar in September.

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