The calculated distance (air line) between Maulavi Bāzār and Sonāmura is approximately 77 miles respectively 124 kilometers.
By car or train, the actual journey to Sonāmura is certainly longer, as only the direct route (as the crow flies) between Maulavi Bāzār and Sonāmura has been calculated here.
Air line (approximately)
124 kilometers
67 nautical miles