United, American, and Alaska Airlines has round-trip flights from Austin (AUS) to Los Angeles (LAX) for $149, NONSTOP. Flights April to May. No Weekends. Departures on Monday, Tuesday, Wednesday, and Thursday. Origin/Destination reversible.
A Carry-on bag and also a personal item is allowed for free on American and Alaska Airlines. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.