For most travelers in 2026, the bus is the superior choice for the Dublin-to-Galway route because it is faster, more frequent, and often cheaper. Direct bus services like Citylink and GoBus depart from Dublin City Center (Crampton Quay) or Dublin Airport every 30 minutes and take approximately 2 hours and 30 minutes via the M6 motorway. Tickets usually range from €15 to €25. In contrast, the Irish Rail (Iarnród Éireann) train departs from Dublin Heuston Station roughly every 2 to 3 hours and takes about 2 hours and 36 minutes. While the train offers more legroom, a bathroom, and a smoother ride, you must first travel from the city center to Heuston Station (via the Luas tram), which adds time and cost to your journey. If you are coming directly from Dublin Airport, the bus is the clear winner as it provides a direct link without needing to transfer in Dublin city center.