The calculated distance (air line) between Bad Münder am Deister 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 Bad Münder am Deister and Wiesbaden has been calculated here.
Air line (approximately)
250 kilometers
135 nautical miles