Trains run every three hours between Dublin and Galway. The earliest departure is at 17:30 in the afternoon, and the last departure from Dublin is at 19:35 which arrives into Galway at 22:04.

The train service between Dublin Heuston and Galway Ceannt is one of the most reliable and frequent corridors operated by Iarnród Éireann (Irish Rail). On a typical weekday in 2026, trains depart approximately every hour during peak times and every two hours during off-peak periods. The first train usually leaves Dublin around 7:30 AM, with the final service departing at roughly 7:30 PM or 8:30 PM depending on the day. The journey typically takes between 2 hours and 20 minutes to 2 hours and 50 minutes, depending on whether it is an express service or one that stops at intermediate stations like Athlone and Ballinasloe. On Sundays, the frequency is slightly reduced, with the first service starting later in the morning. It is highly recommended to book online in advance, as fares are significantly cheaper than buying at the station, and the route is very popular with students and tourists alike, often reaching full capacity on Friday afternoons and Sunday evenings.