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

Return flights

15 Sep - 20 Sep	Asiana Airlines
19 Sep - 23 Sep	Scandinavian Airlines
15 Sep - 19 Oct	Scandinavian Airlines
01 Sep - 05 Sep	Asiana Airlines
09 Sep - 16 Sep	Etihad Airways
04 Sep - 11 Sep	Etihad Airways
02 Sep - 09 Sep	Etihad Airways
07 Sep - 16 Sep	Etihad Airways
03 Sep - 09 Sep	Lufthansa
15 Sep - 20 Oct	Finnair
09 Sep - 13 Sep	Etihad Airways
08 Sep - 19 Sep	China Eastern
28 Sep - 05 Oct	Etihad Airways
29 Sep - 06 Oct	Ethiopian Airlines
30 Sep - 11 Oct	Air Canada
29 Sep - 13 Oct	SWISS

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 569€

Return flights