The calculated distance (air line) between Saiha and Uttar Char Fasson is approximately 146 miles respectively 235 kilometers.
By car or train, the actual journey to Uttar Char Fasson is certainly longer, as only the direct route (as the crow flies) between Saiha and Uttar Char Fasson has been calculated here.
Air line (approximately)
235 kilometers
127 nautical miles