Yes, you can leave the airport during a long layover in Tokyo (Haneda or Narita), provided you meet Japan's visa requirements for your nationality. In 2026, many travelers—including those from the US, UK, Canada, and EU—benefit from visa-free entry for short stays. If you have at least 6 to 8 hours, it is highly recommended to explore. From Haneda (HND), you can reach central districts like Shibuya or Ginza in just 20–30 minutes by train or monorail, making it a "layover-friendly" hub. From Narita (NRT), you'll need at least 10–12 hours to make it worthwhile, as the Narita Express train takes about an hour each way. It is a vital step to clear immigration and customs, so ensure your passport is ready and you have calculated at least 3 hours for the return security and boarding process. If your layover is overnight, Tokyo’s 24-hour ramen shops and capsule hotels provide a perfect "mini-vacation" before your next flight.