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

Return flights

21 Oct - 28 Oct	LOT
01 Oct - 14 Oct	LOT
01 Oct - 10 Oct	LOT
23 Oct - 28 Oct	Air China
28 Oct - 04 Nov	Air China
22 Oct - 27 Oct	Air China
21 Oct - 31 Oct	Air China
23 Oct - 04 Nov	Air China
28 Oct - 07 Nov	Air China
30 Oct - 07 Nov	Air China
16 Oct - 29 Oct	Air China
24 Oct - 04 Nov	Sichuan Airlines
01 Oct - 08 Oct	LOT
01 Oct - 11 Oct	LOT
21 Oct - 26 Oct	Air China
23 Oct - 06 Nov	Air China
19 Oct - 02 Nov	Air China
23 Oct - 02 Nov	Air China
25 Oct - 01 Nov	Air China
30 Oct - 17 Nov	Air China

Also check the deals for one-way flights from Madrid to Seoul in October.

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 October from 558€

Return flights