[05/08/2015 @ 2:53 PM] Old post clean-up. Removed from bookable list.
Round-trip flights from Austin (AUS) to San Juan (ORD) are $280 – $292 on all the major airlines right now. If you live near San Antonio (SAT) you should consider making the hour drive to Austin (AUS), it will save you about $125 on average.
Click for more details and booking links Cheap Flights: Austin to San Juan, Puerto Rico $280-$292 r/t – All Major Airlines