The calculated distance (air line) between Judenburg and Klagenfurt am Wörthersee is approximately 41 miles respectively 66 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 Judenburg and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
66 kilometers
36 nautical miles