| Cheap Flights: Austin to/from Las Vegas $135 r/t [March-April] â JetBlue JetBlue has round-trip flights from Austin (AUS) to Las Vegas (LAS) for $135 with a connection. Flights March to April. No Sunday departures. Weekends available. Origin/Destination reversible. Click for more details and booking links Cheap Flights: Austin to/from Las Vegas $135 r/t [March-April] â JetBlue . | 