The calculated distance (air line) between Citeureup and Rengasdengklok is approximately 36 miles respectively 59 kilometers.
By car or train, the actual journey to Rengasdengklok is certainly longer, as only the direct route (as the crow flies) between Citeureup and Rengasdengklok has been calculated here.
Air line (approximately)
59 kilometers
32 nautical miles