To get from Dublin airport to the city centre most people buy a ticket for the Airlink bus which costs €6 one way or €10 return for adults.
A good tip is to buy a Family ticket which costs €10. This is available from the counter just inside the door of the airport. This ticket gives two adults and up to four kids unlimited travel on all Dublin bus services for 24 hours.
This can be used on the Airlink - I always use it when my partner and I go to Dublin and then use it to go around Dublin.
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