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.
Which stations serve the rail line Galway - Killarney?
You can take the train to Killarney at Galway (Ceannt), which arrives at Killarney.
How long does it take from Galway to Killarney and when do the trains leave?
While the first train to Killarney leaves at 06:07, the last one is scheduled for 17:07. The average duration of the journey is of 5 hours and 3 minutes, but the fastest trains can get you to Killarney in 4 hours and 22 minutes.