The calculated distance (air line) between Saalfelden am Steinernen Meer and Hietzing is approximately 168 miles respectively 271 kilometers.
By car or train, the actual journey to Hietzing is certainly longer, as only the direct route (as the crow flies) between Saalfelden am Steinernen Meer and Hietzing has been calculated here.
Air line (approximately)
271 kilometers
146 nautical miles