The calculated distance (air line) between Chhāgalnāiya and Sātkhira is approximately 157 miles respectively 252 kilometers.
By car or train, the actual journey to Sātkhira is certainly longer, as only the direct route (as the crow flies) between Chhāgalnāiya and Sātkhira has been calculated here.
Air line (approximately)
252 kilometers
136 nautical miles