The calculated distance (air line) between Khulna and Bhairab Bāzār is approximately 124 miles respectively 200 kilometers.
By car or train, the actual journey to Bhairab Bāzār is certainly longer, as only the direct route (as the crow flies) between Khulna and Bhairab Bāzār has been calculated here.
Air line (approximately)
200 kilometers
108 nautical miles