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

Return flights

29 Oct - 06 Nov	Air China
25 Oct - 27 Oct	Air China
26 Oct - 28 Oct	Air China
19 Oct - 26 Oct	Air China
31 Oct - 08 Nov	Air China
16 Oct - 21 Oct	Air China
23 Oct - 28 Oct	Air China
16 Oct - 23 Oct	Air China
24 Oct - 28 Oct	Air China
27 Oct - 01 Nov	Air China
26 Oct - 31 Oct	Air China
16 Oct - 19 Oct	Air China
17 Oct - 26 Oct	Air China

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

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 October from 241€

Return flights