The calculated distance (air line) between Klagenfurt am Wörthersee and Meidling is approximately 143 miles respectively 230 kilometers.
By car or train, the actual journey to Meidling is certainly longer, as only the direct route (as the crow flies) between Klagenfurt am Wörthersee and Meidling has been calculated here.
Air line (approximately)
230 kilometers
124 nautical miles