The calculated distance (air line) between Cileungsir and Rengasdengklok is approximately 28 miles respectively 46 kilometers.
By car or train, the actual journey to Rengasdengklok is certainly longer, as only the direct route (as the crow flies) between Cileungsir and Rengasdengklok has been calculated here.
Air line (approximately)
46 kilometers
25 nautical miles