The calculated distance (air line) between Oberhaid and Klagenfurt am Wörthersee is approximately 108 miles respectively 174 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 Oberhaid and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
174 kilometers
94 nautical miles