The calculated distance (air line) between Groß-Enzersdorf and Hietzing is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Hietzing is certainly longer, as only the direct route (as the crow flies) between Groß-Enzersdorf and Hietzing has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles