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

Return flights

27 Aug - 01 Sep	T'way Air
22 Aug - 26 Aug	Jin Air
26 Aug - 01 Sep	Eastar Jet
27 Aug - 31 Aug	T'way Air
23 Aug - 30 Aug	T'way Air
15 Aug - 15 Sep	Jin Air
25 Aug - 28 Aug	T'way Air
31 Aug - 08 Sep	Korean Air
31 Aug - 10 Sep	Korean Air
19 Aug - 29 Aug	Jin Air
15 Aug - 18 Aug	Air China
13 Aug - 21 Aug	Air China
17 Aug - 23 Aug	Air China
17 Aug - 21 Aug	Air China
21 Aug - 25 Aug	Air China
24 Aug - 08 Sep	Air China
30 Aug - 02 Sep	Air China
24 Aug - 01 Sep	Air China
24 Aug - 02 Sep	Air China
31 Aug - 11 Sep	Korean Air

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

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 August from 293€

Return flights