The calculated distance (air line) between Bad Sooden-Allendorf and Gelsenkirchen is approximately 125 miles respectively 201 kilometers.
By car or train, the actual journey to Gelsenkirchen is certainly longer, as only the direct route (as the crow flies) between Bad Sooden-Allendorf and Gelsenkirchen has been calculated here.
Air line (approximately)
201 kilometers
109 nautical miles