Yes, you are generally allowed to exit the airport and return during a layover in 2026, provided you meet specific conditions. First, you must have the legal right to enter the country (the correct visa or passport). Second, you must have enough time; experts recommend a minimum of 6 to 8 hours for a layover if you plan to leave, as you will need to clear immigration, travel to the city, return, and go back through the full security screening process. It is vital to remember that "leaving" means you must clear security again upon your return, which can take anywhere from 15 minutes to 2 hours depending on the airport. If you are on an international-to-international connection, you must ensure your luggage is "checked through" to your final destination so you don't have to carry it with you. Always keep your boarding pass (physical or digital) as you will need it to re-enter the terminal. If your layover is short (under 4 hours), it is rarely worth the risk, as any delay in city traffic or security lines could result in you missing your connecting flight.