The calculated distance (air line) between Dighwāra and Bakhtiyārpur is approximately 38 miles respectively 61 kilometers.
By car or train, the actual journey to Bakhtiyārpur is certainly longer, as only the direct route (as the crow flies) between Dighwāra and Bakhtiyārpur has been calculated here.
Air line (approximately)
61 kilometers
33 nautical miles