The calculated distance (air line) between Mürzzuschlag and Klagenfurt am Wörthersee is approximately 93 miles respectively 150 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 Mürzzuschlag and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
150 kilometers
81 nautical miles