We stayed within a walking distance to the Vatican to enable us attending the Easter Mass. During our stay, we went to Ostia Antica on our own.
Traveling from Roma S. Pietro to Ostia Antica requires two train services – Roma S. Pietro to Roma Ostiene by regional train then Roma Porta S. Paolo to Ostia Artica by urban railway.
We took a regional train from Roma S. Pietro for Roma Ostiense. Exit the Roma Ostiense regional train station through Piazzale dei Partigiani followed by walking through Viale delle Cave Ardeatine to Roma Porta S. Paolo train station for the Rome-Lido urban railwayline.
Information: Roma S. Pietro to Roma Ostiene – Regional Trainline. Visit Trenitalia.com at https://www.trenitalia.com/ for train schedule and pricing. Porta S. Paolo to Ostia Antica train stazione – Urban Railwayline. Visit RomaMobilita.it at https://romamobilita.it/it for train schedule and pricing.