The calculated distance (air line) between Rieti and Acilia-Castel Fusano-Ostia Antica is approximately 52 miles respectively 84 kilometers.
By car or train, the actual journey to Acilia-Castel Fusano-Ostia Antica is certainly longer, as only the direct route (as the crow flies) between Rieti and Acilia-Castel Fusano-Ostia Antica has been calculated here.
Air line (approximately)
84 kilometers
45 nautical miles