| Nonstop Flights: Austin to/from Las Vegas $97 r/t [September-December] â American Airlines American Airlines has round-trip flights from Austin (AUS) to Las Vegas (LAS) for $97, NONSTOP. Flights September to December. Departures on Monday, Tuesday, Wednesday, Saturday, and Sunday. Mostly midweek. Origin/Destination reversible. Click for more details and booking links Nonstop Flights: Austin to/from Las Vegas $97 r/t [September-December] â American Airlines . | 