How to get from istanbul new airport to sultanahmet old city by metro
1- Take M11 metro from new istanbul airport till kagithane station.
2- You walk to Kagithane – Mecidiyekoy metro station. You get on that metro till Mecidiyekoy station.
3- Mecidiyekoy station, you walk to Mecidiyekoy-Yenikapi metro and you use that metro till Yenikapi station.
4 – Yenikapi station, you walk to Aksaray Tram Station and you take tram till stations, Laleli, Beyazit, Sultanahmet or Sirkeci stations.