The calculated distance (air line) between Mörfelden-Walldorf and Düsseldorf is approximately 116 miles respectively 187 kilometers.
By car or train, the actual journey to Düsseldorf is certainly longer, as only the direct route (as the crow flies) between Mörfelden-Walldorf and Düsseldorf has been calculated here.
Air line (approximately)
187 kilometers
101 nautical miles