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

Return flights

09 Sep - 16 Sep	China Eastern
08 Sep - 15 Sep	China Eastern
13 Sep - 22 Sep	Hainan Airlines
16 Sep - 24 Oct	Hainan Airlines
19 Sep - 12 Oct	Air China
04 Sep - 19 Sep	Air China
17 Sep - 12 Oct	Air China
08 Sep - 21 Sep	China Eastern
17 Sep - 21 Sep	Wizz Air Malta
10 Sep - 16 Sep	Wizz Air Malta
05 Sep - 18 Sep	Air China
19 Sep - 23 Sep	Wizz Air Malta
04 Sep - 16 Sep	Air China
21 Sep - 01 Oct	Air China
20 Sep - 04 Oct	Air China
21 Sep - 07 Oct	Etihad Airways
28 Sep - 09 Oct	Etihad Airways
30 Sep - 09 Oct	Etihad Airways
28 Sep - 16 Oct	Etihad Airways
25 Sep - 12 Oct	Etihad Airways

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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from Madrid to Seoul in September from $573

Return flights