The calculated distance (air line) between Oberndorf bei Salzburg and Klagenfurt am Wörthersee is approximately 112 miles respectively 180 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 Oberndorf bei Salzburg and Klagenfurt am Wörthersee has been calculated here.
Air line (approximately)
180 kilometers
97 nautical miles