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

Return flights

22 Sep - 14 Oct	Ryanair
22 Sep - 11 Oct	Ryanair
22 Sep - 27 Oct	Ryanair
22 Sep - 18 Oct	Ryanair
30 Sep - 15 Oct	Ryanair
24 Sep - 09 Oct	Air France
30 Sep - 23 Oct	Air France
22 Sep - 29 Sep	Ryanair
17 Sep - 24 Sep	KLM
30 Sep - 13 Oct	Ryanair
24 Sep - 06 Oct	Air France
25 Sep - 07 Oct	Air France
16 Sep - 29 Sep	Ryanair
21 Sep - 29 Sep	IndiGo
22 Sep - 30 Sep	Ryanair
23 Sep - 30 Sep	Ryanair
16 Sep - 23 Sep	Ryanair
21 Sep - 25 Sep	Ryanair
27 Sep - 30 Sep	Ryanair
21 Sep - 28 Sep	Ryanair

Also check the deals for one-way flights from Dublin to Seoul 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 Dublin to Seoul in September from $660

Return flights