American Airlines has round-trip flights from Austin (AUS) to Dublin (DUB) for $563-$596 with a connection. Flights February, March, and October. Departures on Monday, Tuesday, Wednesday, and Sunday. 7-day minimum stay required.
A Carry-on bag and also a personal item is allowed for free on American. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Click for more details and booking links Cheap Flights: Austin to Dublin $563-$596 r/t [Feb, Mar, Oct] – American Airlines