The calculated distance (air line) between Mödling and Klagenfurt am Wörthersee is approximately 137 miles respectively 221 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 Mödling and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
221 kilometers
119 nautical miles