The calculated distance (air line) between Weiz and Klagenfurt am Wörthersee is approximately 74 miles respectively 119 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 Weiz and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
119 kilometers
64 nautical miles