The calculated distance (air line) between Stockerau and Klagenfurt am Wörthersee is approximately 151 miles respectively 243 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 Stockerau and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
243 kilometers
131 nautical miles