The calculated distance (air line) between Bad Lauterberg im Harz and Düsseldorf is approximately 162 miles respectively 260 kilometers.
By car or train, the actual journey to Düsseldorf is certainly longer, as only the direct route (as the crow flies) between Bad Lauterberg im Harz and Düsseldorf has been calculated here.
Air line (approximately)
260 kilometers
140 nautical miles