The calculated distance (air line) between Spittal an der Drau and Simmering is approximately 167 miles respectively 269 kilometers.
By car or train, the actual journey to Simmering is certainly longer, as only the direct route (as the crow flies) between Spittal an der Drau and Simmering has been calculated here.
Air line (approximately)
269 kilometers
145 nautical miles