The calculated distance (air line) between Duisburg and Lambres-lez-Douai is approximately 177 miles respectively 286 kilometers.
By car or train, the actual journey to Lambres-lez-Douai is certainly longer, as only the direct route (as the crow flies) between Duisburg and Lambres-lez-Douai has been calculated here.
Air line (approximately)
286 kilometers
154 nautical miles