The calculated distance (air line) between Strasshof an der Nordbahn and Hietzing is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Hietzing is certainly longer, as only the direct route (as the crow flies) between Strasshof an der Nordbahn and Hietzing has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles