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

Return flights

18 Jun - 21 Jun	Air China
19 Jun - 23 Jun	Eastar Jet
18 Jun - 22 Jun	Air China
29 Jun - 01 Jul	Eastar Jet
19 Jun - 22 Jun	Air China
22 Jun - 29 Jun	Air China
24 Jun - 27 Jun	Air China
24 Jun - 26 Jun	Air China
29 Jun - 02 Jul	Eastar Jet
21 Jun - 06 Jul	Air China
24 Jun - 15 Jul	Air China
24 Jun - 07 Jul	Air China
23 Jun - 02 Jul	Air China
20 Jun - 31 Jul	Air China
22 Jun - 14 Jul	Air China
30 Jun - 05 Jul	Air China
22 Jun - 13 Jul	Air China
20 Jun - 22 Jun	Eastar Jet
26 Jun - 28 Jun	Korean Air
25 Jun - 28 Jun	Korean Air

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

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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Cheapest return flights from Seoul to Ulaanbaatar in June from $344

Return flights