The most popular way to get to Anguilla is via the "ferry" from Marigot Bay, St. Martin (a 20 minute taxi from the airport). Ferries run all day between 7:30 am and 6:15 pm at approximately 45 minute intervals. The trip is approximately 20-30 minutes and no reservation is required. The Marigot ferries are relatively large passenger ferries.
One-way fare is US$20. Children under 12 years old, $10.
As an alternate, "link" ferries travel from St. Maarten (Dutch side) airport to Anguilla's Blowing Point Ferry Terminal. Fare starts at $65 one way/$130 round trip + $5 passenger levy. Children's rates are available. Departure times are approximately 7:30 am, 9:30 am, 12:30pm and 4:30 pm and the trip takes about one hour.