The calculated distance (air line) between Chhāgalnāiya and Khagrachhari is approximately 30 miles respectively 48 kilometers.
By car or train, the actual journey to Khagrachhari is certainly longer, as only the direct route (as the crow flies) between Chhāgalnāiya and Khagrachhari has been calculated here.
Air line (approximately)
48 kilometers
26 nautical miles