Yes, you can generally leave the airport during transit in 2026, but it depends on your nationality and the country's visa laws. If you are in a country where your passport allows visa-free entry (like a U.S. citizen transiting through London), you can simply pass through immigration, explore the city, and return for your next flight. However, if the transit country requires a visa for your nationality, you must apply for a Transit Visa in advance. Logistics are also crucial: travel experts recommend a layover of at least 6 to 8 hours to account for deplaning, clearing customs, traveling to the city center, and passing back through security. In 2026, some airports like Singapore Changi even offer free guided city tours for transit passengers, provided they have at least 5.5 hours between flights, making it easier than ever to turn a long layover into a "bonus" mini-vacation.