The calculated distance (air line) between Attnang-Puchheim and Donaustadt is approximately 127 miles respectively 205 kilometers.
By car or train, the actual journey to Donaustadt is certainly longer, as only the direct route (as the crow flies) between Attnang-Puchheim and Donaustadt has been calculated here.
Air line (approximately)
205 kilometers
111 nautical miles