The calculated distance (air line) between Saalfelden am Steinernen Meer and Simmering is approximately 174 miles respectively 281 kilometers.
By car or train, the actual journey to Simmering is certainly longer, as only the direct route (as the crow flies) between Saalfelden am Steinernen Meer and Simmering has been calculated here.
Air line (approximately)
281 kilometers
151 nautical miles