The calculated distance (air line) between Oberthulba and Mönchengladbach is approximately 168 miles respectively 271 kilometers.
By car or train, the actual journey to Mönchengladbach is certainly longer, as only the direct route (as the crow flies) between Oberthulba and Mönchengladbach has been calculated here.
Air line (approximately)
271 kilometers
146 nautical miles