The calculated distance (air line) between Shūshtar and Fereydūnshahr is approximately 96 miles respectively 155 kilometers.
By car or train, the actual journey to Fereydūnshahr is certainly longer, as only the direct route (as the crow flies) between Shūshtar and Fereydūnshahr has been calculated here.
Air line (approximately)
155 kilometers
84 nautical miles