It used to be you could arrive at the airport about an hour or so before a domestic flight, and about two hours before an international one. That was plenty of time to print your boarding pass, pass through security and maybe have a snack before boarding your flight. It's now recommended air travelers give themselves more time at the airport. If you're flying domestically, plan to be at the airport at least 60 to 90 minutes before your flight is scheduled to depart, more if you're checking luggage. Some airports and airlines recommend even earlier airport arrival times, two hours or more, especially for international flights. Give yourself plenty of time.