The Puerto Rico Port Authority operates four ferries per day from the mainland port of Fajardo to Culebra; the trip takes about 90 minutes. The round-trip fare is $4.50 for adults, $2.25 for children 3 to 12 (free for 2 and under). Ferry service has really faltered during 2014, making it recommendable to fly here instead.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.