| Cheap Flights: Austin to/from San Juan, Puerto Rico $169 r/t [January-February] â JetBlue JetBlue has round-trip flights from Austin (AUS) to San Juan, Puerto Rico (SJU) for $169 with a connection. Flights January to February. Very few extended weekends available. Origin/Destination reversible. Click for more details and booking links Cheap Flights: Austin to/from San Juan, Puerto Rico $169 r/t [January-February] â JetBlue . | 