The calculated distance (air line) between Rheda-Wiedenbrück and Düsseldorf is approximately 79 miles respectively 126 kilometers.
By car or train, the actual journey to Düsseldorf is certainly longer, as only the direct route (as the crow flies) between Rheda-Wiedenbrück and Düsseldorf has been calculated here.
Air line (approximately)
126 kilometers
68 nautical miles