The calculated distance (air line) between Bernkastel-Kues and Düsseldorf is approximately 91 miles respectively 147 kilometers.
By car or train, the actual journey to Düsseldorf is certainly longer, as only the direct route (as the crow flies) between Bernkastel-Kues and Düsseldorf has been calculated here.
Air line (approximately)
147 kilometers
79 nautical miles