The calculated distance (air line) between Uttar Char Fasson and Sirajganj is approximately 167 miles respectively 268 kilometers.
By car or train, the actual journey to Sirajganj is certainly longer, as only the direct route (as the crow flies) between Uttar Char Fasson and Sirajganj has been calculated here.
Air line (approximately)
268 kilometers
145 nautical miles