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

Return flights

04 Sep - 08 Sep	Asiana Airlines
13 Sep - 22 Sep	Asiana Airlines
07 Sep - 14 Sep	Asiana Airlines
03 Sep - 10 Sep	Asiana Airlines
09 Sep - 13 Sep	ANA
15 Sep - 19 Sep	Japan Airlines
01 Sep - 08 Sep	Japan Airlines

Also check the deals for one-way flights from Seoul to Brussels in September.

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 September from 524€

Return flights