The calculated distance (air line) between Micheldorf in Oberösterreich and Donaustadt is approximately 110 miles respectively 177 kilometers.
By car or train, the actual journey to Donaustadt is certainly longer, as only the direct route (as the crow flies) between Micheldorf in Oberösterreich and Donaustadt has been calculated here.
Air line (approximately)
177 kilometers
96 nautical miles