The calculated distance (air line) between Düsseldorf-Pempelfort and Tönisvorst is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Tönisvorst is certainly longer, as only the direct route (as the crow flies) between Düsseldorf-Pempelfort and Tönisvorst has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles