From Belfast Central Train Station train to Newry Train Station then taxi to Carlingford Lough. 1 h 18 min £55. From Belfast Europa Bus Centre bus to Newry, line 39 bus to Rostrevor, then taxi to Carlingford Lough. 2 h 43 min £73. From Belfast drive to Carlingford Lough. 59 min £10.
Irish Rail operates a train from Belfast to Carlingford Lough every 4 hours. Tickets cost $15 - $22 and the journey takes 57 min. Alternatively, Translink UK operates a bus from Belfast to Carlingford Lough hourly. Tickets cost $10 - $15 and the journey takes 1 h 5 min. 2 other operators also service this route.