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

Return flights

02 Sep - 18 Sep	KLM
02 Sep - 09 Sep	KLM
02 Sep - 15 Sep	KLM
10 Sep - 18 Sep	Air France
03 Sep - 18 Sep	KLM
23 Sep - 24 Oct	Air China
16 Sep - 10 Oct	LOT
01 Sep - 09 Sep	Air France
30 Sep - 12 Oct	Etihad Airways
30 Sep - 16 Oct	Etihad Airways
21 Sep - 09 Oct	Etihad Airways
01 Sep - 08 Sep	Air France
16 Sep - 23 Sep	Etihad Airways
03 Sep - 16 Sep	Etihad Airways
28 Sep - 12 Oct	Etihad Airways
30 Sep - 14 Oct	Etihad Airways
30 Sep - 13 Oct	Etihad Airways
11 Sep - 22 Sep	Etihad Airways
25 Sep - 10 Oct	Qatar Airways
20 Sep - 25 Oct	Air China

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 $693

Return flights