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

Return flights

30 Sep - 07 Oct	SWISS
23 Sep - 22 Oct	SWISS
04 Sep - 11 Sep	Hainan Airlines
23 Sep - 26 Oct	Hainan Airlines
06 Sep - 16 Sep	Hainan Airlines
01 Sep - 29 Sep	Hainan Airlines
08 Sep - 13 Oct	Hainan Airlines
07 Sep - 31 Oct	Hainan Airlines
08 Sep - 15 Sep	Hainan Airlines
24 Sep - 22 Oct	Hainan Airlines
02 Sep - 22 Sep	Hainan Airlines
08 Sep - 21 Sep	Hainan Airlines
16 Sep - 23 Sep	Hainan Airlines
01 Sep - 09 Oct	Hainan Airlines
25 Sep - 29 Sep	IndiGo
23 Sep - 01 Oct	Etihad Airways
12 Sep - 11 Oct	Hainan Airlines
20 Sep - 27 Sep	IndiGo
01 Sep - 30 Sep	Hainan Airlines
16 Sep - 28 Oct	Etihad Airways

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 341€

Return flights