(Tel: +62-777-324300 in Tanjung Balai; +65-62714866 in HarbourFront) and (Tel: +65-62783167 in Harbourfront) ferry companies operate ferries between Tanjung Balai and Singapore's HarbourFront Centre. Between them, they run 4 trips.From Singapore:0800,1140,1500,1820 (in Singapore time).From Tg. Balai:0730,1100,1400,1700 (in Tg. Balai time). From Singapore, tickets cost S$63 return before Indonesian port taxes or Rp 110.000 one-way before port taxes (Rp 10.000) from Tanjung Balai. Journey time is about one and a half hours.
Please note that the two companies' code-sharing agreement allows you to board any ferry at Tanjung Balai for the return leg to Singapore only if you hold a return ticket that was purchased in Singapore. If you buy your ticket in Tanjung Balai, you can only board the ferry of the company from which you buy the ticket.