The calculated distance (air line) between Gelsenkirchen and Marburg an der Lahn is approximately 87 miles respectively 140 kilometers.
By car or train, the actual journey to Marburg an der Lahn is certainly longer, as only the direct route (as the crow flies) between Gelsenkirchen and Marburg an der Lahn has been calculated here.
Air line (approximately)
140 kilometers
76 nautical miles