The calculated distance (air line) between Neu-Guntramsdorf and Geidorf is approximately 79 miles respectively 127 kilometers.
By car or train, the actual journey to Geidorf is certainly longer, as only the direct route (as the crow flies) between Neu-Guntramsdorf and Geidorf has been calculated here.
Air line (approximately)
127 kilometers
69 nautical miles