| Cheap Flights: Austin to San Jose, Costa Rica $231-$261 r/t [February-September] â Delta / United Delta and United have round-trip flights from Austin (AUS) to San Jose, Costa Rica (SJO) for $231-$261 with a connection. Flights February to September. Weekends available. United fares are more expensive than the Delta fares, but have greater availability. Costa Rica has additional entry requirements due to COVID. You must complete the online Health Assessment and you must purchase travel insurance. Details on this process is on visitcostarica.com. Click for more details and booking links Cheap Flights: Austin to San Jose, Costa Rica $231-$261 r/t [February-September] â Delta / United . | 
