I'm a big believer in buying tickets all the way through, in case there's a delayed or cancelled flight.

A couple days ago I checked, and in March Delta had flights, round-trip, JFK-EIS for $559 R/T. Have you looked at the fares all the way through?

Lately we, and some of our neighbors, have been overnighting in San Juan and taking the early morning Seaborne flight. The savings more than outweigh the cost of the hotel.