Irish Rail operates a train from Dublin to Dalkey every 20 minutes. Tickets cost $4 - $6 and the journey takes 24 min. Alternatively, Dublin Bus operates a bus from Dublin to Dalkey 5 times a week. Tickets cost $6 and the journey takes 45 min. Nitelink also services this route 6 times a week.
From Grand Canal Dock Train Station train to Dalkey Train Station. 24 min 4€. From Dublin City South, Upper Leeson Street bus to Dalkey, Castle Street. 45 min 6€. From Dublin taxi to Dalkey. 16 min 21€. From Dublin drive to Dalkey. 16 min 1€. From Dublin Uber to Dalkey. 16 min 36€. From Dublin walk to Dalkey. 2 h 31 min.