The calculated distance (air line) between Fereydūnshahr and Falāvarjān is approximately 85 miles respectively 137 kilometers.
By car or train, the actual journey to Falāvarjān is certainly longer, as only the direct route (as the crow flies) between Fereydūnshahr and Falāvarjān has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles