[sundaeofshock]

For a day trip to LA? I usually arrive 60-90 minutes before my flight.

[paxys]

Even that is overkill. With TSA Pre/Clear and no checked bags you can easily roll in ~45 mins before the flight.

[wenc]

I have Precheck and typically clear security in under 10 minutes. That said, 45 mins is cutting it close for me. Typically I arrive an hour before so that I have a buffer against uncertainty (Precheck lines can be surprising long sometimes).