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

Return flights

15 Sep - 22 Sep	Asiana Airlines
22 Sep - 30 Sep	Japan Airlines
07 Sep - 17 Sep	Japan Airlines
14 Sep - 19 Sep	Japan Airlines
02 Sep - 09 Sep	Japan Airlines
13 Sep - 27 Sep	Japan Airlines
11 Sep - 25 Sep	Japan Airlines
12 Sep - 25 Sep	Japan Airlines
15 Sep - 26 Sep	Japan Airlines
16 Sep - 23 Sep	Japan Airlines
30 Sep - 06 Oct	Japan Airlines
29 Sep - 06 Oct	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.

Book a cheap hotel in Brussels

Cheap car rent in Brussels

Cheapest return flights from Seoul to Brussels in September from $754

Return flights