JetBlue has round-trip flights from Austin (AUS) to Fort Lauderdale (FLL) starting at $137, NONSTOP. $69 each-way. Flights mid-January to April. Holiday blackout applies. Origin/Destination reversible. A few weekends available in February, March, and April.
Note: Fare allows for a free carry-on bag and seat selection. Upgrades into “Regular Economy” are available for +23 each-way.
Note: Spirit has fares for $104, but those will be more expensive if you plan on taking a carry-on bag, eating, drinking, or picking a seat, due to their excessive fee structure.
Click for more details and booking links Nonstop Flights: Austin to/from Fort Lauderdale $137-$141 r/t – JetBlue