American Airlines has round-trip flights from San Antonio and Austin (SAT/AUS) to Curaçao (CUR) for $421 with a connection. Flights in March and April.
Note: Other dates in March may also be available but they will require an overnight stay in Miami on the return flight.
Note: Carry-on bag is allowed for free on American Airlines. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Click for more details and booking links Cheap Flights: San Antonio and Austin to Curacao $421 r/t – American