The calculated distance (air line) between Gallneukirchen and Klagenfurt am Wörthersee is approximately 120 miles respectively 192 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 Gallneukirchen and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
192 kilometers
104 nautical miles