The calculated distance (air line) between Hainburg an der Donau and Wiener Neustadt is approximately 41 miles respectively 65 kilometers.
By car or train, the actual journey to Wiener Neustadt is certainly longer, as only the direct route (as the crow flies) between Hainburg an der Donau and Wiener Neustadt has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles