Southwest has round-trip flights from Austin (AUS) to San Jose, Costa Rica (SJO) starting at $307, with a connection. $135/$173 each-way. Flights sparse and scattered from February to May. Weekends available. Origin/Destination reversible.
Note: Don’t waste your time with United or Spirit “deals” on this route. They don’t allow for free bags and charge for seat selection.
Note: You can save up to an additional $150 if you book your Flight+Hotel together as a package on Southwest Vacations and use the ‘YEARENDINT’ coupon-code at checkout. Before you commit, always compare the prices of the individual Flights and Hotel with other hotel booking sites like Expedia or TripAdvisor.