The calculated distance (air line) between Fereydūnshahr and Nahāvand is approximately 132 miles respectively 213 kilometers.
By car or train, the actual journey to Nahāvand is certainly longer, as only the direct route (as the crow flies) between Fereydūnshahr and Nahāvand has been calculated here.
Air line (approximately)
213 kilometers
115 nautical miles