The calculated distance (air line) between Zirl and Klagenfurt am Wörthersee is approximately 151 miles respectively 244 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 Zirl and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
244 kilometers
131 nautical miles