The calculated distance (air line) between Karlsruhe and Limburg an der Lahn is approximately 96 miles respectively 155 kilometers.
By car or train, the actual journey to Limburg an der Lahn is certainly longer, as only the direct route (as the crow flies) between Karlsruhe and Limburg an der Lahn has been calculated here.
Air line (approximately)
155 kilometers
84 nautical miles