AirHint found the following cheapest return flights from Seoul (GMP) to Dublin (DUB) in September 2025 (see full year).

Return flights

12 Sep - 19 Sep	Air China
19 Sep - 27 Sep	Air China
02 Sep - 06 Sep	China Eastern
08 Sep - 16 Sep	Air China
21 Sep - 27 Sep	Air China
20 Sep - 27 Sep	Air China
20 Sep - 26 Sep	Air China
15 Sep - 19 Sep	China Eastern
13 Sep - 19 Sep	Asiana Airlines
20 Sep - 28 Sep	Air China
26 Sep - 11 Oct	Air China
29 Sep - 06 Oct	China Southern

Also check the deals for one-way flights from Seoul to Dublin in September.

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 Dublin in September from 599€

Return flights