When travelling on such short distances, you can take into account also busses and carpooling options: with some luck you will find very cheap options, even if you book on short notice.
What are the departure and arrival stations in Clondalkin and Dublin?
The trains to Dublin will leave from Clondalkin Fonthill and will arrive at Docklands.
How long does it take from Clondalkin to Dublin and when do the trains leave?
The first train to Dublin leaves at 06:09, whereas the last one at 16:09. On average, the journey lasts 1 hour and 19 minutes, but with the fastest connections you will be in Dublin in 50 minutes.