As of 2026, there is no direct train service that runs from Dublin Airport to Belfast. To travel by rail between the two cities, you must first take a bus or taxi from Dublin Airport to Dublin Connolly Station in the city center. From there, you can board the "Enterprise" train service, which is jointly operated by Iarnród Éireann and Translink. This train runs roughly every hour and takes approximately 2 hours and 15 minutes to reach Belfast Grand Central Station (the new flagship terminal that replaced Lanyon Place). While the rail journey is scenic and offers premium dining options, it is not the most direct route from the airport. For those seeking the fastest and most convenient connection, several direct bus operators like Aircoach (Route 705X) and Translink (Route X1/X2) run directly from Dublin Airport to Belfast city center 24/7. These buses take about 2 hours and are the preferred choice for most international travelers landing in Dublin who wish to avoid the extra step of traveling into the city center to catch a train.