Spirit has round-trip flights from Austin (AUS) to Fort Lauderdale (FLL) for $64, NONSTOP. Flights August to September. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Extended weekends available. Origin/Destination reversible.
Spirit fares do not include a free carry-on bag. Only a small personal item, like a Jansport SuperBreak backpack is free. You can avoid paying for seat selection if you accept the randomly assigned seat prior to boarding.
Click for more details and booking links Nonstop Flights: Austin to/from Fort Lauderdale $64 r/t [August-September] – Spirit