AirHint found the following cheapest return flights from Madrid (MAD) to Seoul (ICN) in September 2026 (see full year).

Return flights

22 Sep - 08 Oct	LOT
02 Sep - 09 Sep	Etihad Airways
01 Sep - 10 Sep	Etihad Airways
01 Sep - 12 Sep	Cathay Pacific
01 Sep - 07 Sep	Cathay Pacific
01 Sep - 08 Sep	Cathay Pacific
01 Sep - 30 Sep	Iberia
08 Sep - 29 Sep	Iberia
14 Sep - 30 Sep	Qatar Airways
03 Sep - 10 Sep	KLM
01 Sep - 09 Sep	Etihad Airways
30 Sep - 05 Oct	LOT
03 Sep - 02 Oct	Iberia
21 Sep - 04 Oct	Qatar Airways
15 Sep - 01 Oct	Finnair
18 Sep - 01 Oct	Finnair
25 Sep - 04 Oct	Emirates
25 Sep - 09 Oct	Qatar Airways
15 Sep - 01 Oct	Korean Air	direct
18 Sep - 01 Oct	Korean Air	direct

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 603€

Return flights