 Give you time to eat, too, if you're hungry. Especially if you're traveling internationally or checking a bag, you might be looking at three or more hours of lead time just to be safe. I'm a planner, so I'd say two hours. Pack snacks, good books, something to read. Wishing you a safe flight, Matt Koufax. WTOP News. Sports at 25 and 55 brought to you by Amentum. Solving what's next. Engineering a safer, smarter, cleaner world.