| Nonstop Flights: Austin to Orlando or Las Vegas $41 r/t [January-March] â Spirit / Frontier Spirit and Frontier have round-trip flights from Austin (AUS) to Orlando or Las Vegas (MCO, LAS) for $41, NONSTOP. Flights January to March. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Note:Â Fares do not include a free carry-on bag. Only a small personal item, like a Jansport City Scout backpack is free. You can avoid paying for seat selection if you accept the randomly assigned seat prior to boarding. Note: Seats only have 28-inches of pitch; 2-to-3 inches less space than most other airlines. Click for more details and booking links Nonstop Flights: Austin to Orlando or Las Vegas $41 r/t [January-March] â Spirit / Frontier . | 