The calculated distance (air line) between Ries and Klagenfurt am Wörthersee is approximately 64 miles respectively 103 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 Ries and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
103 kilometers
56 nautical miles