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

Return flights

19 Dec - 07 Jan	Air China
19 Dec - 03 Jan	Air China
02 Dec - 06 Dec	Air China
18 Dec - 05 Jan	Japan Airlines
14 Dec - 05 Jan	Japan Airlines
17 Dec - 30 Dec	Japan Airlines
08 Dec - 13 Dec	Japan Airlines
15 Dec - 04 Jan	Japan Airlines
18 Dec - 03 Jan	Japan Airlines
24 Dec - 03 Jan	Japan Airlines
07 Dec - 13 Dec	Japan Airlines
22 Dec - 23 Dec	Japan Airlines
27 Dec - 03 Jan	Japan Airlines
28 Dec - 04 Jan	Japan Airlines
23 Dec - 04 Jan	Japan Airlines
19 Dec - 29 Dec	Japan Airlines

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 538€

Return flights