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

Return flights

09 Dec - 22 Dec	Hainan Airlines
02 Dec - 09 Dec	China Eastern
04 Dec - 09 Dec	China Eastern
04 Dec - 10 Dec	China Eastern
05 Dec - 11 Dec	China Eastern
08 Dec - 14 Dec	China Eastern
05 Dec - 13 Dec	China Eastern
04 Dec - 11 Dec	China Eastern
04 Dec - 14 Dec	China Eastern
07 Dec - 14 Dec	China Eastern
31 Dec - 18 Jan	Air China
30 Dec - 05 Jan	Air China
30 Dec - 09 Jan	Air China
17 Dec - 05 Jan	Air China
11 Dec - 06 Jan	Air China
12 Dec - 11 Jan	Air China
30 Dec - 06 Jan	Air China
02 Dec - 02 Jan	China Southern
27 Dec - 07 Jan	China Southern
11 Dec - 29 Jan	China Eastern

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

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 December from 491€

Return flights