Miami International Airport (MIA) is a major global hub and is fully operational 24 hours a day, 7 days a week. While the airport itself never closes, the availability of specific services varies during the overnight hours. Most airline check-in counters close after the last departing flight and reopen in the early morning (typically around 4:00 AM). Similarly, while some security checkpoints remain open 24/7 to accommodate late-night arrivals and early departures, others may close during the quietest periods. If you have a long overnight layover, you can stay within the terminal; however, many concessions, shops, and restaurants close between 10:00 PM and 6:00 AM, though you can usually find 24-hour options like certain cafes or vending machines in the Central Terminal. The airport also features an on-site hotel, the Miami International Airport Hotel, located in Terminal E, which provides 24-hour access for travelers needing a bed. Transportation services like taxis and rideshares are available at all hours, though the frequency of public transit like the Metrorail is reduced during the late-night "owl" schedule.