United Airlines offers roundtrip flights to Las Vegas from select cities in the U.S. with prices starting at $261, as provided by ShermansTravel. (Click on "United.com" in the main paragraph to see this sale; all taxes are included.) That's the lowest current price we could find for select routes by $3. This price is valid on flights departing from Austin, TX, (AUS) to Las Vegas, NV, (LAS) on June 4; prices vary depending on the departure cities and dates chosen. Blackout dates may apply. Book this travel deal by May 20 for travel through June 30. Other notable fares: