Is it easy to take the train from Termini Station in Rome to Ostia Antica? We are hoping to do this trip on Easter.
Yes
Just one change en-route.
Technically you are on the metro system. But it is easy.
Very easy, and it’s a short walk from the station in Ostia to the entrance.
This site will give you the specifics to head to Ostia Antica. We really enjoyed our half day there!
Metro from Termini to Piramide, walk next door to the Porto San Paolo station and then train to Ostia Antica. Note there are two Ostia stations, Antica is for the ruins and Lido is for the resort town, the next stop down the line.
RS Rome Guidebook has a useful section on visiting Ostia, including how to get there by train.
Also Rick has an audio guide you can download for free. I enjoyed it.