The calculated distance (air line) between Bhairab Bāzār and Kailāshahar is approximately 68 miles respectively 109 kilometers.
By car or train, the actual journey to Kailāshahar is certainly longer, as only the direct route (as the crow flies) between Bhairab Bāzār and Kailāshahar has been calculated here.
Air line (approximately)
109 kilometers
59 nautical miles