In 2026, a 1.5-hour connection at Tokyo's major airports (Narita or Haneda) is generally considered sufficient but tight, depending strictly on whether your flights are on a single ticket. If you are flying with a single carrier like Japan Airlines or ANA, their "Minimum Connection Time" is often as low as 60 minutes because they facilitate the transfer of your luggage and provide dedicated transit security lanes. However, if you must change terminals—especially at Narita between Terminal 1 and 2—or if you have to clear immigration and re-check bags for separate tickets, 1.5 hours is very risky. Haneda is generally more efficient for domestic-to-international transfers, but you should factor in 20 minutes for taxiing and 15 minutes for walking to the next gate. While Japanese airports are world-renowned for their punctuality and efficiency, any slight delay in your inbound flight or a long queue at the "International Transfer" security screening could cause you to miss your boarding window, which usually closes 20 minutes before departure.