| Cheap Flights: Austin or San Antonio to San Jose or Liberia, Costa Rica $306-$323 r/t [August-November] â United United has round-trip flights from Austin or San Antonio (AUS, SAT) to San Jose or Liberia, Costa Rica (SJO, LIR) for $306-$323 with a connection. Flights August to November. Weekends available. Click for more details and booking links Cheap Flights: Austin or San Antonio to San Jose or Liberia, Costa Rica $306-$323 r/t [August-November] â United . | 