Technically, you are allowed to leave the airport during a layover if you have the proper legal documents, but with only a 4-hour layover, it is strongly recommended that you stay inside the terminal. In 2026, a 4-hour window is considered "impossible" for sightseeing. From the moment you land, it can take 30 to 60 minutes to deplane and clear immigration (on international flights). If you were to leave, you would then need at least 45 to 60 minutes for round-trip travel to a city center. Most importantly, you must return to the airport and clear security again, which can take another 45 to 90 minutes during peak times. This leaves you with practically zero time to actually see anything. For a 4-hour layover, your "sightseeing" would likely be limited to the airport's parking lot or a nearby hotel lobby. It is much more "grounded" to utilize the airport's 2026 amenities, such as a premium lounge, a transit hotel, or high-end dining, rather than risking a missed flight due to a single traffic jam or security line delay.