Keep in mind that these schedules change all the time, even day to day. Allow plenty of time to catch a ferry. Since there are two ferry lines, you have a very good chance of getting on a ferry at any given hour from early morning till about 11pm at night. The ferries do not run on the half hour. Cost at this time for a one way ticket is $110 pesos (about $10 US). And don't miss that last ferry if you are trying to make a bus or plane. Good Luck !!