All ferries departing from Samui will stop at Koh Phangan to pick up travelers from there on route to Koh Tao.
Lomprayah has two daily trips, the first one departing at 8.30 am, the afternoon one leaves 13.00 pm.
SeaTran also offer 2 trips, the first one departing at 8.30 am, the afternoon one leaves 14.00 pm.
SongSerm has only one trip, departing 12 noon, but allthough the tickets are a bit cheaper, the savings in your wallet don't compensate for the slower and inferior boats.
All tickets can be bought either on line or with any travel agency on Koh Phangan.