The calculated distance (air line) between Bintulu and Bandar Seri Begawan is approximately 177 miles respectively 285 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 Bintulu and Bandar Seri Begawan has been calculated here.
Air line (approximately)
285 kilometers
154 nautical miles