Bus Éireann provides buses from Busáras in Dublin City Centre to Tralee (Route 285) and Killarney (Route 284), where there is a connecting Bus Éireann bus to Dingle.
See www.buseireann.ie for journey times from Tralee and Killarney to Dingle.
There is a coach service from Dublin to Tralee that runs regularly and has reasonable fares. Onward taxi and bus links can be arranged from Tralee to Dingle.
A train runs from Heuston Station in Dublin to Cork, and to the Tralee line.
Duration: Approx: 4 hours.