We are considering a 2017 trip to Ireland with RS. The tour ends in Belfast and we are planning on flying in/out of Dublin airport.
1. Is there public transport for this? How much cost?
2. how long does it take? Our flight back to US is at 11am so we estimate we need to be at airport by 8am. This would be on a Saturday morning
Bus every hour to Dublin airport taking 1 hour 45 minutes, so the 6 am bus will get you there at 7:45 am.
http://www.translink.co.uk/Services/Goldline/
8 GBP advance on-line, 14.50 GBP bought at the station.