Delta Airlines have round trip airfares travelling from Houston (IAH) to Charlotte Amalie St. Thomas USVI (STT) for $252, making 1 quick stop, each way. This is a main cabin, regular economy fare.
Departs IAH: Aug 28; Sept 6, 10, 17, 18, 24, 25; Oct 2; Dec 2
Returns: wide and good availability returns
Use dates and book it on Priceline [priceline.com]
or Delta Airlines [delta.com]
. Bundling hotel with airfare will save money.