Nonstop Flights: Austin to Liberia, Costa Rica $176 r/t [January-March] (limited dates) â American Airlines American Airlines has round-trip flights from Austin (AUS) to Liberia, Costa Rica (LIR) for $176, NONSTOP. Flights January to March. Departures on Tuesday. Click for more details and booking links Nonstop Flights: Austin to Liberia, Costa Rica $176 r/t [January-March] (limited dates) â American Airlines . |