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

Return flights

17 Sep - 22 Sep	Indonesia AirAsia
17 Sep - 21 Sep	Indonesia AirAsia
26 Sep - 14 Oct	AirAsia
26 Sep - 07 Oct	AirAsia
09 Sep - 21 Sep	AirAsia
09 Sep - 22 Sep	AirAsia
17 Sep - 07 Oct	Thai AirAsia
11 Sep - 21 Sep	AirAsia
11 Sep - 22 Sep	AirAsia
12 Sep - 03 Oct	AirAsia
08 Sep - 21 Sep	AirAsia
08 Sep - 22 Sep	AirAsia
12 Sep - 21 Sep	AirAsia
12 Sep - 22 Sep	AirAsia
25 Sep - 14 Oct	AirAsia
14 Sep - 03 Oct	AirAsia
26 Sep - 03 Oct	AirAsia
17 Sep - 03 Oct	Thai AirAsia
16 Sep - 07 Oct	AirAsia
14 Sep - 04 Oct	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 $312

Return flights