We took a ferry from Koh Lanta to Koh Phi Phi island and journey took us about 2 hours. From Saladan Pier to Ton Sai one-way ticket cost is 450 BHT (14 USD). During the trip we witnessed some interesting behavior. A few passengers that were travelling on our boat to someplace else, had to switch boats on the open sea. That was unexpected and fun to watch at the same time. Ton Sai Pier is rather small, so companies do not to waste time on mooring and waiting for people to switch ferry, they found a quicker and cheaper way to do it on the water. Fun fact I would say????