| Cheap Flights: Austin or San Antonio to Key West $214-$217 r/t [September-October] â American Airlines / Delta American Airlines, Delta, and Envoy Air as American Airlines Eagle have round-trip flights from Austin or San Antonio (AUS/SAT) to Key West (EYW) for $214-$217 with a connection. Flights September to October. No Thursday departures. Extended weekends available. Carry-on bag is allowed for free. 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: Austin or San Antonio to Key West $214-$217 r/t [September-October] â American Airlines / Delta . | 
