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

Return flights

17 Sep - 15 Oct	Wizz Air Malta
08 Sep - 14 Sep	Wizz Air Malta
15 Sep - 23 Sep	KLM
21 Sep - 11 Oct	Wizz Air Malta
11 Sep - 14 Oct	Air China
16 Sep - 23 Sep	Air France
23 Sep - 11 Oct	Air China
27 Sep - 11 Oct	LOT
23 Sep - 10 Oct	LOT
27 Sep - 10 Oct	LOT
09 Sep - 16 Sep	Etihad Airways
09 Sep - 18 Sep	Etihad Airways
08 Sep - 23 Sep	Air France
14 Sep - 23 Sep	Air France
02 Sep - 16 Sep	Etihad Airways
18 Sep - 16 Oct	Etihad Airways
18 Sep - 28 Oct	Iberia Express
28 Sep - 12 Oct	Etihad Airways
05 Sep - 23 Sep	Air France
07 Sep - 23 Sep	Air France

Also check the deals for one-way flights from Madrid 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 Madrid to Seoul in September from 568€

Return flights