The calculated distance (air line) between Bad Lauterberg im Harz and Gelsenkirchen is approximately 145 miles respectively 234 kilometers.
By car or train, the actual journey to Gelsenkirchen is certainly longer, as only the direct route (as the crow flies) between Bad Lauterberg im Harz and Gelsenkirchen has been calculated here.
Air line (approximately)
234 kilometers
126 nautical miles