The calculated distance (air line) between Bernkastel-Kues and Wiesbaden is approximately 53 miles respectively 86 kilometers.
By car or train, the actual journey to Wiesbaden is certainly longer, as only the direct route (as the crow flies) between Bernkastel-Kues and Wiesbaden has been calculated here.
Air line (approximately)
86 kilometers
46 nautical miles