The calculated distance (air line) between Bihār Sharīf and Dighwāra is approximately 49 miles respectively 79 kilometers.
By car or train, the actual journey to Dighwāra is certainly longer, as only the direct route (as the crow flies) between Bihār Sharīf and Dighwāra has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles