Irish Rail operates a train from Dublin to Clonmacnoise every 2 hours. Tickets cost $28 - $40 and the journey takes 1 h 17 min. Alternatively, Citylink operates a bus from Dublin to Clonmacnoise hourly. Tickets cost $11 - $20 and the journey takes 1 h 45 min.
How to get from Dublin to Clonmacnoise
From Heuston Train Station train to Athlone Train Station then taxi to Clonmacnoise. 1 h 41 min 60€. From Temple Bar, Crampton Quay bus to Athlone A I T then taxi to Clonmacnoise. 2 h 5 min 45€. From Busáras bus to Ballydangan then taxi to Clonmacnoise. 3 h 17 min 50€. From Dublin drive to Clonmacnoise. 1 h 30 min 17€.