The calculated distance (air line) between Bīrjand and Eslam Qaleh is approximately 163 miles respectively 263 kilometers.
By car or train, the actual journey to Eslam Qaleh is certainly longer, as only the direct route (as the crow flies) between Bīrjand and Eslam Qaleh has been calculated here.
Air line (approximately)
263 kilometers
142 nautical miles