The calculated distance (air line) between Dortmund and Sint-Kwintens-Lennik is approximately 152 miles respectively 244 kilometers.
By car or train, the actual journey to Sint-Kwintens-Lennik is certainly longer, as only the direct route (as the crow flies) between Dortmund and Sint-Kwintens-Lennik has been calculated here.
Air line (approximately)
244 kilometers
132 nautical miles