The calculated distance (air line) between Cox’s Bāzār and Sonārgaon is approximately 177 miles respectively 284 kilometers.
By car or train, the actual journey to Sonārgaon is certainly longer, as only the direct route (as the crow flies) between Cox’s Bāzār and Sonārgaon has been calculated here.
Air line (approximately)
284 kilometers
153 nautical miles