The calculated distance (air line) between Karlsruhe and Marburg an der Lahn is approximately 125 miles respectively 202 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 Karlsruhe and Marburg an der Lahn has been calculated here.
Air line (approximately)
202 kilometers
109 nautical miles