By bus
Bus Eireann (http://www.buseireann.ie) provide the State bus service in Ireland. The main Bus Terminal is located right in the heart of the city. Bus services run from all major cities and smaller towns into Waterford and is probably the easiest and least expensive way to travel to the city.
By train
Plunkett Railway Station is the main train station in Waterford. It is on the the north side of the river. You can travel anywhere in Ireland on the rail network (http://www.cie.ie). Plunkett Station is outdated, and as the large signs posted over the entire building suggest, due an upgrade. Don't hang around wondering where the services are and just start your trek across the bridge.
By plane
Waterford airport is 6km south of the City, and can be reached from certain locations in the UK, Europe during the Summer and other major Irish airports. Aer Arann (http://www.aerarann.ie) have daily flights to London-Luton airport, as well as several times weekly flights to Birmingham and Manchester. There is now also a daily flight to the rapidly expanding London Southend Airport in Essex. Flybe also run a year-round service to Birmingham BHX. There are also summer time flights to Lorient Brittany. The Airport runs four services a week to Amsterdam and several flights to Bordeaux. Waterford is also ideally located between Dublin and Cork and therefore has access to both airports for long distance flights.