My flight is at 630pm how early can I get through security?

2 hours at least.

I always get there 2 hours before

Best time to arrive is 2 hours prior to departure time

Don't know that there is a time restiction. If you want to sit for hours waiting for your flight, I'm sure they'll let you.

U can be at the airport early that morning, but it is not necessary to be there so soon. They suggest being at the airport 2 hours prior to your flight is sufficient for domestic flights. Earlier, if u have an international flight. However, I would suggest u bring your own food since it is pretty expensive to eat at the airport.