The calculated distance (air line) between Neu-Guntramsdorf and Simmering is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to Simmering is certainly longer, as only the direct route (as the crow flies) between Neu-Guntramsdorf and Simmering has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles