The calculated distance (air line) between Bandar Lampung and Rengasdengklok is approximately 149 miles respectively 240 kilometers.
By car or train, the actual journey to Rengasdengklok is certainly longer, as only the direct route (as the crow flies) between Bandar Lampung and Rengasdengklok has been calculated here.
Air line (approximately)
240 kilometers
129 nautical miles