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

Return flights

11 May - 25 May	Iberia
21 May - 30 May	Ryanair
26 May - 11 Jun	LOT
14 May - 26 May	LOT
11 May - 26 May	LOT
25 May - 04 Jun	LOT
19 May - 27 May	LOT
19 May - 04 Jun	LOT
19 May - 28 May	Iberia
17 May - 24 May	Air China
26 May - 05 Jun	Air China
28 May - 04 Jun	LOT
12 May - 19 May	LOT
15 May - 22 May	Air China
14 May - 24 May	Air China
22 May - 07 Jun	Air China
22 May - 05 Jun	Air China
21 May - 05 Jun	Air China
14 May - 05 Jun	Lufthansa
29 May - 14 Jun	Etihad Airways

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

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 May from $626

Return flights