The calculated distance (air line) between Bhairab Bāzār and Sonāmura is approximately 44 miles respectively 71 kilometers.
By car or train, the actual journey to Sonāmura is certainly longer, as only the direct route (as the crow flies) between Bhairab Bāzār and Sonāmura has been calculated here.
Air line (approximately)
71 kilometers
38 nautical miles