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

Return flights

29 Dec - 02 Jan	AirAsia
30 Dec - 02 Jan	AirAsia
28 Dec - 02 Jan	AirAsia
06 Dec - 13 Dec	Royal Brunei	direct
06 Dec - 09 Dec	Royal Brunei	direct
30 Dec - 18 Jan	AirAsia
21 Dec - 01 Jan	AirAsia
30 Dec - 01 Jan	AirAsia
12 Dec - 01 Jan	Thai AirAsia
30 Dec - 03 Jan	Royal Brunei	direct
21 Dec - 07 Jan	AirAsia
21 Dec - 08 Jan	AirAsia
05 Dec - 13 Dec	Thai AirAsia
04 Dec - 13 Dec	Thai AirAsia
05 Dec - 11 Dec	Thai AirAsia
06 Dec - 27 Dec	AirAsia
06 Dec - 11 Dec	Thai AirAsia
06 Dec - 26 Dec	Thai AirAsia
04 Dec - 11 Dec	Thai AirAsia
05 Dec - 26 Dec	AirAsia

Also check the deals for one-way flights from Bangkok to Bandar Seri Begawan in December.

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 December from $383

Return flights