Every year I head down I compare the EIS vs STT option for getting into Tortola. Getting a couple of extra hours on Tortola is nice, and we have done that route, but When I booked last year price was not even close.
Almost $400 per ticket more to get into EIS. (just checked kayak and IAD to EIS is running $800-$1200. STT flights are about $480) Even taking the taxis, we about cover all our provisioning with the price difference.

Once we touch down in STT we are on island time. And the view from the ferry on the trip over ain't too shabby either.
We arrive STT @ 1:30 and will be in Roadtown by 4pm.

Now put in ferry dock at the STT airport...now that would be nice! <img src="http://www.traveltalkonline.com/forums/images/graemlins/Clapping.gif" alt="" />