The calculated distance (air line) between Bad Königshofen im Grabfeld and Duisburg is approximately 179 miles respectively 289 kilometers.
By car or train, the actual journey to Duisburg is certainly longer, as only the direct route (as the crow flies) between Bad Königshofen im Grabfeld and Duisburg has been calculated here.
Air line (approximately)
289 kilometers
156 nautical miles