...what time would you leave Disneyland? At the moment, I am considering all options, but I don't know how much time to allow. It is a domestic flight.
If you have no rental car and no luggage and it's not a holiday weekend I'd do noon. You could probably get away with 12:30 but the key is to get to the LAX area before 2pm because that's when traffic really picks up on Fridays.
Are you driving yourselves so needing to park or being dropped off? Being dropped off you would probably be fine with 12:30, 1:00 would be pushing it. If you need to park or are relying on some sort of public transportation leave at noon.