From Belfast Central Train Station train to Newry Train Station then taxi to Rostrevor. 1 h 12 min £44. From Belfast Europa Bus Centre bus to Newry then line 39 bus to Rostrevor. 2 h 13 min £14. From Belfast taxi to Rostrevor. 48 min £114. From Belfast drive to Rostrevor. 48 min £8.
Irish Rail operates a train from Belfast to Rostrevor every 4 hours. Tickets cost $15 - $22 and the journey takes 57 min. Alternatively, Translink UK operates a bus from Belfast to Rostrevor hourly. Tickets cost $10 - $15 and the journey takes 1 h 5 min. 2 other operators also service this route.