AirHint found the following cheapest return flights from Bangkok (BKK) to Bandar Seri Begawan (BWN) in September 2025 (see full year).

Return flights

30 Sep - 05 Oct	AirAsia
02 Sep - 05 Sep	AirAsia
27 Sep - 29 Sep	AirAsia
05 Sep - 07 Sep	AirAsia
02 Sep - 09 Sep	Thai AirAsia
02 Sep - 03 Sep	Thai AirAsia
30 Sep - 06 Oct	Thai AirAsia
30 Sep - 10 Oct	Thai AirAsia
30 Sep - 13 Oct	Thai AirAsia
29 Sep - 10 Oct	Thai AirAsia
29 Sep - 13 Oct	Thai AirAsia
30 Sep - 03 Oct	Thai AirAsia
29 Sep - 03 Oct	Thai AirAsia
30 Sep - 14 Oct	Thai AirAsia
29 Sep - 14 Oct	Thai AirAsia
04 Sep - 09 Sep	AirAsia
02 Sep - 22 Sep	Thai AirAsia
02 Sep - 23 Sep	AirAsia
04 Sep - 23 Sep	AirAsia
04 Sep - 22 Sep	AirAsia

Also check the deals for one-way flights from Bangkok to Bandar Seri Begawan 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 Bandar Seri Begawan in September from $254

Return flights