The calculated distance (air line) between Shāhīn Dezh and Salmās is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to Salmās is certainly longer, as only the direct route (as the crow flies) between Shāhīn Dezh and Salmās has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles