I am in need of cost, time and distance/directions between Ryanair Rome airport Rome to the Camp de' Fiori section of Rome, and the Ryanair Venice airport (I know it is fairly far north of Venice) to the heart of Venice.
I believe that information is all on the Ryan Air website.
You can also get ground transportation information on the Ciampino airport (Rome) site and the Treviso airport (Venice) site.
If you are traveling from Rome to Venice (you didn't say) or v-v, don't expect flying to be faster. There are hourly trains (as opposed to a couple of flights per day) between Rome and Venice. The fastest trains make the trip in less than 4 hour. Flight time plus transit time to and from airports, pre-board time, and deplaning and finding ground transportation are likely to take longer than that.