The calculated distance (air line) between Qaşr Lībiyā and Benghazi is approximately 86 miles respectively 139 kilometers.
By car or train, the actual journey to Benghazi is certainly longer, as only the direct route (as the crow flies) between Qaşr Lībiyā and Benghazi has been calculated here.
Air line (approximately)
139 kilometers
75 nautical miles