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

Return flights

13 Apr - 17 Apr	Air China
13 Apr - 20 Apr	Air China
10 Apr - 14 Apr	Air China
20 Apr - 25 Apr	Air China
13 Apr - 16 Apr	Air China
03 Apr - 05 Apr	Air China
12 Apr - 14 Apr	Air China
15 Apr - 19 Apr	Air China
29 Apr - 03 May	Air China
29 Apr - 04 May	Air China
29 Apr - 05 May	Air China
20 Apr - 24 Apr	Air China
17 Apr - 20 Apr	Air China
30 Apr - 09 May	Asiana Airlines

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

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 April from 421€

Return flights