Dublin Airport has no train connection. There are advanced plans to connect the airport to Dublin with the metro connection. If you want to travel by train you can take bus 748 from Dublin Bus to Heuston and Connolly stations.
Car and bus
The airport is very easily accessible, it is next to highway M1 and the exit is on the ring road of Dublin (M50).
There are many bus connections between Dublin Airport and various destinations in Ireland. AirCoach and Dublin Bus have lines to Dublin for €7.00 and €5.00, respectively. AirCoach goes to destinations further to the south and the north. Bus Eireann maintains a fast service between Dublin and Belfast which also stops at the airport. JJ Kavanagh has bus connections to the south, and Citylink is the bus company that goes to destinations in the west. All buses leave from stops close to the exit of the Arrivals Hall.
Car rental - Dublin Airport
Car rental companies at Dublin Airport are: Avis, Budget, Europcar, Hertz, Murrays and National, you can rent a car on site with these companies, but there are also a considerable number of counters for companies where you can book in advance: Argus, Atlas, Dan Dooley, Hamills, Malone, Sixt and Thrifty. You can also reserve a rental car in advance using the service EasyTerra provides, they compare the rates of several car rental providers in a single quote.
Taxis are in front of the Arrivals Hall. All taxis have meters but they are only used for destinations in the so-called Dublin City Taxi Metered Area. Apart from that you must negotiate the price beforehand, a ride to the center of Dublin costs approximately €20.00, but there may be an extra charge for baggage there is also an added surcharge for evenings and weekends.
Luxury cars with a driver can be booked with ECL (tel: +353(0)1 842 0249).
Passengers can be dropped off in the area in front of the Departures Hall, but this is strictly for dropping off passengers. The road by the Arrivals Hall does not allow private vehicles, unattended vehicles will be towed away.
Opposite the terminal is a parking garage for short-term parking, the base rate is €1.50 for half an hour running to €30.00 for the whole day. The area for long-term parking is at the east side of the airport, the rate is €8.50 per day. There is a shuttle bus from the parking lot to the terminal. For further information about parking at Dublin Airport (tel: +353(0)1 814 4828).
For the busy business traveler that regularly uses Dublin Airport, there is the Collinstown Executive Car Parking Service where you unload in front of the terminal and a driver will park your car, the cost is €5,000 per year (tel: +353 (0)1 814 4895).