Hi Cliff!
It's always a good idea to book in advance, since you'll be traveling in June.
You can sometimes pay on the day, but booking online will guarantee your seats, especially for the longer leg between Dublin and Galway.
You can check out websites like
Bus Éireann or
Citylink for schedules and bookings.
For the Galway to Doolin stretch, check out Bus Éireann Route 350, which connects Galway to the Cliffs of Moher and passes through Doolin.
Check out our
public transport page for all the other information on transport in Ireland and useful links.
Enjoy the wedding and the stunning views out west! 💚