The calculated distance (air line) between Bad Neuenahr-Ahrweiler and Düsseldorf is approximately 49 miles respectively 79 kilometers.
By car or train, the actual journey to Düsseldorf is certainly longer, as only the direct route (as the crow flies) between Bad Neuenahr-Ahrweiler and Düsseldorf has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles