The calculated distance (air line) between Schwalbach am Taunus and Karlsruhe is approximately 79 miles respectively 127 kilometers.
By car or train, the actual journey to Karlsruhe is certainly longer, as only the direct route (as the crow flies) between Schwalbach am Taunus and Karlsruhe has been calculated here.
Air line (approximately)
127 kilometers
69 nautical miles