The calculated distance (air line) between Sankt Veit an der Glan and Hietzing is approximately 133 miles respectively 215 kilometers.
By car or train, the actual journey to Hietzing is certainly longer, as only the direct route (as the crow flies) between Sankt Veit an der Glan and Hietzing has been calculated here.
Air line (approximately)
215 kilometers
116 nautical miles