Super cheap flights from Ft. Lauderdale, Florida to San Juan, Puerto Rico?

I am trying to fly in to San Juan, Puerto Rico from Fort Lauderdale, Florida to visit my family as I have not seen them in a while. The specific dates are: May 10- May 21. I have been looking for reasonable tickets but I haven't found any yet. Does anyone know where I can find cheap tickets if not super cheap? Thanks, much appreciated.