The calculated distance (air line) between Dillingen an der Donau and Wiesbaden is approximately 145 miles respectively 233 kilometers.
By car or train, the actual journey to Wiesbaden is certainly longer, as only the direct route (as the crow flies) between Dillingen an der Donau and Wiesbaden has been calculated here.
Air line (approximately)
233 kilometers
126 nautical miles