The calculated distance (air line) between Kufstein and Klagenfurt am Wörthersee is approximately 120 miles respectively 194 kilometers.
By car or train, the actual journey to Klagenfurt am Wörthersee is certainly longer, as only the direct route (as the crow flies) between Kufstein and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
194 kilometers
105 nautical miles