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

Return flights

30 Sep - 28 Oct	IndiGo
25 Sep - 02 Oct	Pegasus Airlines
24 Sep - 26 Oct	Pegasus Airlines
27 Sep - 26 Oct	Ryanair
23 Sep - 16 Oct	IndiGo
25 Sep - 15 Oct	IndiGo
25 Sep - 16 Oct	IndiGo
23 Sep - 20 Oct	IndiGo
26 Sep - 20 Oct	IndiGo
28 Sep - 10 Oct	IndiGo
23 Sep - 27 Sep	IndiGo
23 Sep - 30 Sep	IndiGo
24 Sep - 30 Sep	IndiGo
22 Sep - 27 Sep	IndiGo
22 Sep - 29 Sep	IndiGo
22 Sep - 26 Sep	IndiGo
27 Sep - 30 Sep	IndiGo
22 Sep - 25 Sep	IndiGo
24 Sep - 29 Sep	Etihad Airways
25 Sep - 30 Sep	Etihad Airways

Also check the deals for one-way flights from Brussels to Bangkok 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 Brussels to Bangkok in September from 384€

Return flights