The calculated distance (air line) between Düsseldorf and Herk-de-Stad is approximately 73 miles respectively 117 kilometers.
By car or train, the actual journey to Herk-de-Stad is certainly longer, as only the direct route (as the crow flies) between Düsseldorf and Herk-de-Stad has been calculated here.
Air line (approximately)
117 kilometers
63 nautical miles