The calculated distance (air line) between Mörfelden-Walldorf and Wiesbaden is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Wiesbaden is certainly longer, as only the direct route (as the crow flies) between Mörfelden-Walldorf and Wiesbaden has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles