The calculated distance (air line) between Dortmund and Braine-le-Château is approximately 150 miles respectively 241 kilometers.
By car or train, the actual journey to Braine-le-Château is certainly longer, as only the direct route (as the crow flies) between Dortmund and Braine-le-Château has been calculated here.
Air line (approximately)
241 kilometers
130 nautical miles