Trains:
Trains in Ireland are a great way to travel to larger cities, especially if you are leaving from Dublin but trains are not the best if you are not using Dublin as a hub. A train gives you a great view of the passing countryside but you miss a lot of the local culture because most trains don’t stop in the villages, towns, and historical landmarks scattered across the landscape. However, trains are fast and efficient if you start your journey from Dublin making it easy to transfer to other larger cities like Kilkenny, Waterford, Galway, or Cork.
Flights:
Ireland is pretty compact, which makes domestic air travel unnecessary. The Republic of Ireland has three main airports with direct flights from North America, often arriving in or departing from Dublin and Shannon. When you consider high-speed trains, modern highways, and the time it takes to reach an airport and pass through security, it is much easier to travel domestically by car or train. It also saves you time in your travel schedule if you fly into one airport and out of another, as the main airports are on opposite sides of the country, so you don’t have to backtrack.