There are currently no nonstops from BWI Airport to SXM, on any airline. The only nonstop to SXM from the DC area is United on the weekends (only), in high season. boucharda said that he thinks that BWI will be the east coast hub for Southwest flights to SXM. If Jet Blue does start flying nonstop from FLL to SXM, it sure would be nice if SW comes into Orlando and does a nonstop from there, but I'm not holding my breath on either.