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

Return flights

07 Jul - 13 Jul	Eastar Jet
08 Jul - 13 Jul	Eastar Jet
10 Jul - 15 Jul	T'way Air
16 Jul - 20 Jul	T'way Air
09 Jul - 13 Jul	Jin Air
03 Jul - 10 Jul	Eastar Jet
09 Jul - 14 Jul	Jin Air
01 Jul - 05 Aug	T'way Air
15 Jul - 20 Jul	T'way Air
05 Jul - 15 Jul	T'way Air
01 Jul - 01 Aug	T'way Air
19 Jul - 24 Jul	T'way Air
30 Jul - 08 Aug	Air China
25 Jul - 08 Aug	Air China
25 Jul - 02 Aug	Air China
25 Jul - 18 Aug	Air China
25 Jul - 14 Aug	Air China
25 Jul - 15 Aug	Air China
25 Jul - 16 Aug	Air China
25 Jul - 17 Aug	Air China

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 $285

Return flights