The calculated distance (air line) between Düsseldorf and Kwaadmechelen is approximately 71 miles respectively 115 kilometers.
By car or train, the actual journey to Kwaadmechelen is certainly longer, as only the direct route (as the crow flies) between Düsseldorf and Kwaadmechelen has been calculated here.
Air line (approximately)
115 kilometers
62 nautical miles