| Nonstop Flights: Austin to/from Las Vegas $171-$185 r/t [June-November] â American Airlines American Airlines has round-trip flights from Austin (AUS) to Las Vegas (LAS) for $171-$185, NONSTOP. Flights June to November. Mostly weekdays. Origin/Destination reversible. Main Cabin. No change fee. Seat selection. Yes, we know that itâs possible to get a flight for about $129 on Frontier, but their fares donât allow for a free carry-on bag, their seats are smaller, they donât allow for free seat selection, or cancellation. Click for more details and booking links Nonstop Flights: Austin to/from Las Vegas $171-$185 r/t [June-November] â American Airlines . | 