The calculated distance (air line) between Monte Porzio Catone and Rocca di Papa is approximately 4 miles respectively 6 kilometers.
By car or train, the actual journey to Rocca di Papa is certainly longer, as only the direct route (as the crow flies) between Monte Porzio Catone and Rocca di Papa has been calculated here.
Air line (approximately)
6 kilometers
3 nautical miles