The calculated distance (air line) between Münstertal/Schwarzwald and Wiesbaden is approximately 155 miles respectively 250 kilometers.
By car or train, the actual journey to Wiesbaden is certainly longer, as only the direct route (as the crow flies) between Münstertal/Schwarzwald and Wiesbaden has been calculated here.
Air line (approximately)
250 kilometers
135 nautical miles