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

Return flights

24 Sep - 06 Oct	Etihad Airways
01 Sep - 16 Sep	Etihad Airways
18 Sep - 04 Oct	Etihad Airways
03 Sep - 13 Sep	Etihad Airways
07 Sep - 13 Sep	Etihad Airways
04 Sep - 17 Sep	Lufthansa
02 Sep - 16 Sep	Lufthansa
01 Sep - 17 Sep	Lufthansa
03 Sep - 17 Sep	Lufthansa
08 Sep - 13 Sep	Etihad Airways
27 Sep - 11 Oct	Etihad Airways
01 Sep - 15 Sep	Cathay Pacific
14 Sep - 28 Sep	Etihad Airways
29 Sep - 06 Oct	Iberia Express
25 Sep - 18 Oct	Etihad Airways
24 Sep - 06 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 626€

Return flights