Delta and American Airlines have round-trip flights from Austin and San Antonio (AUS/SAT) to Liberia, Costa Rica (LIR) for $316 with a connection. Flights September to October. Weekends available.
Note: Austin flights are on Delta. San Antonio flights are on American.
Note: Carry-on bag is allowed for free on Delta and American Airlines. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.