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

Return flights

15 Sep - 22 Sep	Hainan Airlines
16 Sep - 20 Sep	IndiGo
04 Sep - 27 Sep	Hainan Airlines
03 Sep - 15 Sep	Hainan Airlines
02 Sep - 22 Sep	Hainan Airlines
03 Sep - 22 Sep	Hainan Airlines
02 Sep - 09 Sep	Hainan Airlines
02 Sep - 21 Sep	Hainan Airlines
14 Sep - 21 Sep	Hainan Airlines
01 Sep - 14 Sep	Hainan Airlines
30 Sep - 07 Oct	IndiGo
23 Sep - 02 Oct	IndiGo
18 Sep - 04 Oct	IndiGo
16 Sep - 15 Oct	Finnair
19 Sep - 26 Oct	IndiGo
22 Sep - 02 Oct	Etihad Airways
24 Sep - 02 Oct	Etihad Airways
12 Sep - 11 Oct	Etihad Airways
04 Sep - 07 Oct	Emirates
23 Sep - 21 Oct	Emirates

Also check the deals for one-way flights from Bangkok 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 Bangkok to Brussels in September from $635

Return flights