You can go to the JFK's International airport website and also to MIA"s int'l site and check the flight to SDQ/STI/POP/LRM/PUJ, etc...
That at least will give you an idea, but it's too bad that Aerodom doesn't have a website to provide that info to the pax flying to and from Dom. Rep.
I don't remember the sites, but you can go to ie.: Yahoo.com and probably you'll get it there.
Good luck.