The calculated distance (air line) between Gänserndorf and Klagenfurt am Wörthersee is approximately 164 miles respectively 263 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 Gänserndorf and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
263 kilometers
142 nautical miles