Here's the deal: Yes, your metabolism affects your size, and the faster your personal motor runs, the more calories you'll burn. But the truth is, a slow metabolism isn't the real reason you're packing on pounds. You are the reason.
As a general rule, arrive at the airport no later than two hours before your domestic flight is scheduled to depart. This is somewhat later than the typical suggestion of three hours for an international flight.
Re: How many hrs. before flight should I arrive at Airport. Jul 15, 2012, 9:21 AM. Security to the US takes longer than to other countries so you'll need to be there 2 hours before the flight. If you are traveling business or first and can go through priority lanes, then you could cut it down to 90 minutes.