The calculated distance (air line) between Fereydūnshahr and Khvānsār is approximately 22 miles respectively 36 kilometers.
By car or train, the actual journey to Khvānsār is certainly longer, as only the direct route (as the crow flies) between Fereydūnshahr and Khvānsār has been calculated here.
Air line (approximately)
36 kilometers
19 nautical miles