The calculated distance (air line) between Clausthal-Zellerfeld and Wiesbaden is approximately 150 miles respectively 241 kilometers.
By car or train, the actual journey to Wiesbaden is certainly longer, as only the direct route (as the crow flies) between Clausthal-Zellerfeld and Wiesbaden has been calculated here.
Air line (approximately)
241 kilometers
130 nautical miles