The calculated distance (air line) between Bielefeld and Marburg an der Lahn is approximately 85 miles respectively 137 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 Bielefeld and Marburg an der Lahn has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles