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

Return flights

21 Dec - 15 Jan	Etihad Airways
01 Dec - 04 Dec	LOT
20 Dec - 15 Jan	Asiana Airlines
21 Dec - 06 Jan	Lufthansa
22 Dec - 16 Jan	Lufthansa
04 Dec - 11 Dec	Lufthansa
05 Dec - 09 Dec	Lufthansa
25 Dec - 04 Jan	Lufthansa
26 Dec - 02 Jan	Lufthansa
25 Dec - 01 Jan	Lufthansa
05 Dec - 30 Dec	Lufthansa
22 Dec - 30 Dec	Lufthansa
09 Dec - 15 Dec	LOT
22 Dec - 06 Jan	Lufthansa
23 Dec - 28 Jan	Lufthansa
16 Dec - 28 Jan	Lufthansa
18 Dec - 25 Dec	Air China
21 Dec - 31 Dec	Etihad Airways
02 Dec - 04 Dec	Etihad Airways
13 Dec - 20 Dec	Finnair

Also check the deals for one-way flights from Seoul to Brussels 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 Seoul to Brussels in December from $609

Return flights