Our August-September Tour ends in Belfast and we have plane reservations out of Dublin. What is the best way to get from Belfast to Dublin? Is it reasonable to leave Belfast early in the morning for a mid day flight out of Dublin?
Two hour by bus. Will drop you at the airport. http://www.dublinairport.com/gns/to-from-the-airport/by-bus-or-coach.aspx
Yes, and the train is easy and quite pleasant, too.
Ah, though train goes to Dublin, not sure if that is what you would want or have time for?
Either bus or train would get you there, but I wouldn't take the chance of leaving on the same day of a flight in case of track work, a strike, or some other such situation. If you are flying on Aer Lingus, you must clear immigration and customs before you leave Ireland, so you must arrive very early.