The calculated distance (air line) between Gries and Klagenfurt am Wörthersee is approximately 61 miles respectively 98 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 Gries and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
98 kilometers
53 nautical miles