The calculated distance (air line) between Chhāgalnāiya and Bāndarban is approximately 73 miles respectively 117 kilometers.
By car or train, the actual journey to Bāndarban is certainly longer, as only the direct route (as the crow flies) between Chhāgalnāiya and Bāndarban has been calculated here.
Air line (approximately)
117 kilometers
63 nautical miles