The calculated distance (air line) between Korschenbroich and Tönisvorst is approximately 9 miles respectively 14 kilometers.
By car or train, the actual journey to Tönisvorst is certainly longer, as only the direct route (as the crow flies) between Korschenbroich and Tönisvorst has been calculated here.
Air line (approximately)
14 kilometers
8 nautical miles