The general recommendation is to arrive at the airport two hours before a domestic flight. This allows enough time for check-in, security screening, and boarding procedures. However, if traveling light with no checked bags and using online check-in, arriving about an hour before may often suffice depending on factors like airport size, time of day, and security wait times. Airlines and TSA generally advise two hours to ensure enough buffer for unexpected delays or busy periods, especially at large or busy airports.
