The calculated distance (air line) between Duisburg and Düsseldorf-Pempelfort is approximately 13 miles respectively 22 kilometers.
By car or train, the actual journey to Düsseldorf-Pempelfort is certainly longer, as only the direct route (as the crow flies) between Duisburg and Düsseldorf-Pempelfort has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles