The calculated distance (air line) between Saalfelden am Steinernen Meer and Hernals is approximately 168 miles respectively 270 kilometers.
By car or train, the actual journey to Hernals is certainly longer, as only the direct route (as the crow flies) between Saalfelden am Steinernen Meer and Hernals has been calculated here.
Air line (approximately)
270 kilometers
146 nautical miles