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

Return flights

16 Sep - 10 Oct	Hainan Airlines
02 Sep - 15 Sep	Hainan Airlines
05 Sep - 21 Oct	China Eastern
16 Sep - 15 Oct	Air China
16 Sep - 16 Oct	Air China
16 Sep - 14 Oct	Air China
02 Sep - 08 Sep	Hainan Airlines
06 Sep - 19 Sep	Hainan Airlines
06 Sep - 23 Sep	Air China
06 Sep - 15 Sep	Hainan Airlines
11 Sep - 01 Oct	Air China
13 Sep - 04 Oct	Air China
14 Sep - 04 Oct	Air China
12 Sep - 02 Oct	Air China
17 Sep - 12 Oct	Air China
14 Sep - 19 Sep	Air China
08 Sep - 22 Sep	Air China
11 Sep - 21 Sep	Air China
16 Sep - 22 Sep	Air China
07 Sep - 16 Sep	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 487€

Return flights