The calculated distance (air line) between Gerasdorf bei Wien and Hainburg an der Donau is approximately 24 miles respectively 39 kilometers.
By car or train, the actual journey to Hainburg an der Donau is certainly longer, as only the direct route (as the crow flies) between Gerasdorf bei Wien and Hainburg an der Donau has been calculated here.
Air line (approximately)
39 kilometers
21 nautical miles