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

Return flights

02 Sep - 12 Sep	Hainan Airlines
07 Sep - 15 Sep	Air China
16 Sep - 19 Sep	Air China
16 Sep - 23 Sep	Air China
10 Sep - 17 Sep	Air China
27 Sep - 10 Oct	Hainan Airlines
07 Sep - 17 Sep	Air China
07 Sep - 23 Sep	Air China
03 Sep - 23 Sep	Air China
16 Sep - 24 Oct	Hainan Airlines
27 Sep - 13 Oct	Hainan Airlines
24 Sep - 11 Oct	Air China
13 Sep - 27 Oct	Hainan Airlines
11 Sep - 17 Sep	China Eastern
12 Sep - 23 Sep	Ryanair
23 Sep - 16 Oct	Air China
19 Sep - 31 Oct	Air China
19 Sep - 19 Oct	Air China
11 Sep - 24 Oct	Air China
23 Sep - 30 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 508€

Return flights