The calculated distance (air line) between Bangar and Bandar Seri Begawan is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Bandar Seri Begawan is certainly longer, as only the direct route (as the crow flies) between Bangar and Bandar Seri Begawan has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles