Northern Ireland has three airports, sea crossings from England and Scotland, and a direct rail link from Dublin.
You can fly direct to Belfast from over 20 European cities and a number of North American locations. Aer Lingus, British Airways, KLM and Eastern Airways all fly to and from Belfast City Airport and EasyJet, Ryanair, Jet2, and Wizz all fly to and from Belfast International Airport.
Belfast has ferry crossings from Scotland, England and the Isle of Man: Stena Line (travelling from Liverpool and Cairnryan), P&O Irish Sea (travelling from Cairnryan), and Isle of Man Steam Packet Company (travelling from Isle of Man).
From the republic of Ireland, Irish Rail operates services from towns and cities across the Republic of Ireland to Dublin’s Connolly Station, where you can then catch a connecting train to Belfast. There are also buses from Dublin.
More on the Visit Belfast website.