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

Return flights

29 Sep - 04 Oct	China Eastern
23 Sep - 27 Sep	Air China
23 Sep - 25 Sep	Air China
29 Sep - 21 Oct	China Eastern
25 Sep - 07 Oct	Etihad Airways
29 Sep - 12 Oct	Etihad Airways
22 Sep - 25 Sep	Etihad Airways
23 Sep - 28 Oct	Air China
30 Sep - 16 Oct	China Eastern
23 Sep - 26 Sep	Air China
22 Sep - 31 Oct	China Eastern
29 Sep - 15 Oct	China Eastern
23 Sep - 30 Sep	T'way Air
29 Sep - 18 Oct	HK Express
22 Sep - 29 Sep	Air China
19 Sep - 21 Sep	T'way Air
24 Sep - 01 Oct	Air China
21 Sep - 25 Sep	T'way Air
21 Sep - 29 Sep	T'way Air
23 Sep - 29 Sep	T'way Air

Also check the deals for one-way flights from Seoul to Madrid 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 Madrid in September from $739

Return flights