AirHint found the following cheapest return flights from Brussels (BRU) to Bangkok (BKK) in September 2026 (see full year).

Return flights

01 Sep - 15 Sep	Finnair
09 Sep - 30 Sep	Finnair
02 Sep - 15 Sep	Finnair
01 Sep - 21 Sep	Finnair
02 Sep - 16 Sep	Finnair
01 Sep - 01 Oct	Finnair
02 Sep - 15 Oct	Finnair
01 Sep - 23 Sep	Finnair
08 Sep - 30 Sep	Finnair
01 Sep - 22 Sep	Finnair
04 Sep - 22 Sep	Finnair
07 Sep - 21 Sep	Finnair
28 Sep - 20 Oct	Finnair
02 Sep - 15 Oct	Thai Airways	direct
14 Sep - 12 Oct	IndiGo

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 $632

Return flights