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 early do I need to get to JFK for International Flight. Feb 08, 2011, 8:12 PM. I would plan to arrive at the airport between 2 and 4 hours in advance of your flight, but at least 2 hours in advance. I prefer to get there as early as possible so not to rush.