The calculated distance (air line) between Spittal an der Drau and Hietzing is approximately 162 miles respectively 261 kilometers.
By car or train, the actual journey to Hietzing is certainly longer, as only the direct route (as the crow flies) between Spittal an der Drau and Hietzing has been calculated here.
Air line (approximately)
261 kilometers
141 nautical miles