The calculated distance (air line) between Wiesbaden and Mönchengladbach is approximately 110 miles respectively 177 kilometers.
By car or train, the actual journey to Mönchengladbach is certainly longer, as only the direct route (as the crow flies) between Wiesbaden and Mönchengladbach has been calculated here.
Air line (approximately)
177 kilometers
95 nautical miles