In April it could be busy as lots of folks travel then. On a good day you should be ok. But as Carol said if your flight leaves SXM late your connection time will be tight. We have found that more and more flights, both domestic and international, have been delayed causing us some stress. If you end up booking this flight and your flight leaving SXM is delayed I would get to a ticket agent in SXM who can help you with another connection flight.