International 2 hours, US 1 hour prior.
Plan on at least one hour, especially if you have luggage to check. Ninety minutes or two hours is a good investment if time, especially if you don't fly regularly. If you're dropping off a rental car, plan on being at the rental office at least two hours before the flight.
In my experience it doesn't take more than 15 minutes to get through security.
If you have TSA pretty, it is a breeze usually. Domestic flights I take usually begin boarding 30 min before departure. I'd recommend allowing at least an hour.
It's not as busy at night, but plan for 2 hours before international flight and 1 hour before domestic..
Won't be busy at that hour, no earlier than 12 am for sure
2 hours early
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