| Cheap Flights: Austin to/from San Juan, Puerto Rico $197 r/t [Sep, Jan, Feb] â Delta [04/22/2022 @ 09:55 AM CT] Price dropped to $197. Was $227. Delta has round-trip flights from Austin (AUS) to San Juan, Puerto Rico (SJU) for $197 with a connection. Flights September, January, and February. No Sunday departures. Extended weekends available. Origin/Destination reversible. Click for more details and booking links Cheap Flights: Austin to/from San Juan, Puerto Rico $197 r/t [Sep, Jan, Feb] â Delta . | 