The calculated distance (air line) between Dortmund and Berchem-Sainte-Agathe is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to Berchem-Sainte-Agathe is certainly longer, as only the direct route (as the crow flies) between Dortmund and Berchem-Sainte-Agathe has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles