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

Return flights

29 Sep - 28 Oct	AJet
24 Sep - 26 Oct	Pegasus Airlines
25 Sep - 23 Oct	Pegasus Airlines
22 Sep - 28 Oct	AJet
30 Sep - 28 Oct	AJet
28 Sep - 23 Oct	AJet
28 Sep - 30 Oct	AJet
22 Sep - 23 Oct	AJet
29 Sep - 27 Oct	AJet
19 Sep - 23 Oct	AJet
05 Sep - 11 Sep	Hainan Airlines
07 Sep - 08 Sep	Hainan Airlines
16 Sep - 23 Sep	Austrian Airlines
18 Sep - 25 Sep	Austrian Airlines
15 Sep - 25 Sep	Austrian Airlines
15 Sep - 24 Sep	Austrian Airlines
15 Sep - 17 Sep	Austrian Airlines
22 Sep - 29 Sep	Austrian Airlines
17 Sep - 29 Sep	Austrian Airlines
16 Sep - 20 Sep	Austrian Airlines

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 431€

Return flights