There is only one ferry I know of that offers this service. " A ferry runs between Cruz Bay, St. John; Charlotte Amalie, St. Thomas and Fajardo. The price is $60 one way and $100 round trip. Transportation Services offers this service. The ferry leaves twice a month on Friday in the mid-afternoon. It returns on Sunday. Advance purchase is required. It is suggested you call (340)776-6282 for more details and specific dates and times."

Link for USVI ferry info
https://www.vinow.com/general_usvi/interisland_ferry/index.php#top

Islander omits the fact that it is about 60 miles of open ocean that you would be traversing in one of the STJ-STT ferries. It is not known as the calmest passage...The extra $ for airfare is worth it!

Thanks for your help! is there a favorite air service you would recommend?
Thanks,
Karen

East Ender is right it is a long trip, but if you are trying to be frugal and don't mind by all means - get ready for a ride.

For flying in you can use American Airlines, There are smaller ones also, Air St. Thomas, Cape Air - try
https://www.vinow.com/general_usvi/getting_here/airline_list.php for a list of airlines with service into/out of the USVI.

Thanks for all your help!
Karen