The calculated distance (air line) between Duisburg and Ludwigshafen am Rhein is approximately 154 miles respectively 247 kilometers.
By car or train, the actual journey to Ludwigshafen am Rhein is certainly longer, as only the direct route (as the crow flies) between Duisburg and Ludwigshafen am Rhein has been calculated here.
Air line (approximately)
247 kilometers
134 nautical miles