Passenger-only ferries to Playa del Carmen leave Cozumel's main pier approximately every hour on the hour from 5 AM to 10 PM, though there's often no ferry at 1 PM. They also leave Playa del Carmen's dock about every hour on the hour, from 6 AM to 11 PM. The trip takes 45 minutes. Call, or better yet, stop by the ferry pier, to verify the times. Bad weather and changing schedules sometimes prompt cancellations. The trip costs about $12 each way.
The traditional car ferry leaves from Puerto Morelos. The trip takes three to five hours. The fare starts at about $60 for small cars (more for larger vehicles) and $6 per passenger. Another car ferry travels between Calica south of Playa del Carmen and Cozumel three times daily. The fare starts at about $55 for small cars (more for larger vehicles) and $5 per passenger.
Passenger-only ferries (987/872-1508 or 987/872-1588). Car ferry from Puerto Morelos (987/872-0950). Car ferry from Calica (987/872-7688).