| Cheap Flights: Austin to San Jose, Costa Rica $218 r/t [September-October] â JetBlue JetBlue has round-trip flights from Austin (AUS) to San Jose, Costa Rica (SJO) for $218 with a connection. Flights September to October. Very few weekends available. Click for more details and booking links Cheap Flights: Austin to San Jose, Costa Rica $218 r/t [September-October] â JetBlue . | 