Just buy them on the day at the airport. Buy them off the driver. The bus leaves every hour and is rarely half full.Edited: 15 October 2017, 08:47
It can be cheaper if you precook, but note that there are 2 services per hour by different operators so it’s probably best to take the next departure.Edited: 15 October 2017, 12:40
No need to prebook, I think if you do you save about a pound or two but I wonder if prebooking locks you into the specific bus? No worries, like others are saying, the busses and the train don't fill up really. We ended up taking the train from Belfast to Dublin so we could stretch our legs more and it was worth it. Trains also run constantly and didn't fill up.
Train is a valid alternative from Dublin City but not Airport.
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