The calculated distance (air line) between Ludweiler-Warndt and Gelsenkirchen is approximately 158 miles respectively 255 kilometers.
By car or train, the actual journey to Gelsenkirchen is certainly longer, as only the direct route (as the crow flies) between Ludweiler-Warndt and Gelsenkirchen has been calculated here.
Air line (approximately)
255 kilometers
137 nautical miles