Originally Posted by KLouis

You are getting conflicting answers because you are asking the same question in different forums and get answers from all kinds of good Samaritans, including ones who worry too much like you or some who have no idea but still want to say something. Now to you.

Simple: you'll arrive at FCO 2 hours and 12 minutes before the departure of your flight; this is more than enough time to check-in for an intra-Europe flight (Schengen, for that matter), go through security (no passport/police/iimigration control!) and walk the 5-10 minutes to the gate (C gates). No way of predicting the length of the queues at CI, but with, usually, 4 positions (wo)manned and many people having no bag and already OLCI's, waiting will be rather short. Therefore, enough time for some shopping left, as well as for a last cappuccino. So stop worrying and learn to love the bomb!

Of course there is always Murphy's law to consider. If you are one of these people who atract all bad things there is only one solution, go to the airport the evening before as taxis could have a flat or trains could derail.

Conclusion: take the train that gets there at 5:52 and everything will be fine!

PS Intra-Schengen flights (Italy, netherlands and Spain are all part of that club) are handles as domestic flights