From Colwyn Bay train to Holyhead, ferry to Dun Laoghaire Train Station, line 15 train to Westland Row, Pearse Station, bus to Heuston Train Station, then line 4 train to Kilkenny. 6hrs 04min £80. From Colwyn Bay, Hesketh Road (Eirias Park Arena) bus to Llandudno Junction, Station (Llandudno Junction Station), line 5 bus to Bangor, Railway Station (Bangor Railway Station), bus to Holyhead, ferry to Dun Laoghaire Train Station, line 15 train to Dublin, then line 7 bus to Kilkenny. 8hrs 24min £73. From Colwyn Bay drive to Holyhead, ferry to Dún Laoghaire, then drive to Kilkenny. 4hrs 59min £62.