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

Return flights

29 Jul - 02 Aug	Jeju Air	direct
30 Jul - 02 Aug	Jeju Air	direct
31 Jul - 03 Aug	Air China
28 Jul - 30 Jul	Air China
28 Jul - 03 Aug	Air China
28 Jul - 02 Aug	Air China
29 Jul - 07 Aug	Air China
31 Jul - 02 Aug	Air China
30 Jul - 13 Aug	Air China
31 Jul - 10 Aug	Air China
30 Jul - 04 Aug	Air China
27 Jul - 29 Jul	Jeju Air	direct
29 Jul - 31 Jul	Jeju Air	direct
27 Jul - 30 Jul	Jeju Air
27 Jul - 31 Jul	Jeju Air	direct
28 Jul - 30 Jul	T'way Air	direct
27 Jul - 30 Jul	Korean Air	direct
27 Jul - 28 Jul	Korean Air	direct
27 Jul - 27 Jul	Korean Air	direct

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

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 July from 423€

Return flights