The calculated distance (air line) between Khalkhāl and Khorramdarreh is approximately 104 miles respectively 168 kilometers.
By car or train, the actual journey to Khorramdarreh is certainly longer, as only the direct route (as the crow flies) between Khalkhāl and Khorramdarreh has been calculated here.
Air line (approximately)
168 kilometers
90 nautical miles