M4 Line — İstanbul Metro
Kadıköy – Sabiha Gökçen Havalimanı · 23 stations.
The line at a glance
The M4 line serves 23 stations between Kadıköy and Sabiha Gökçen Havalimanı. M4 was the first metro line on the Anatolian side: it runs from Kadıköy through Kartal and Pendik to Sabiha Gökçen Havalimanı. There are connections to Marmaray at Ayrılık Çeşmesi, to M8 at Kozyatağı, and to ferries and trams at Kadıköy.
M4 line stations
M4 opened in 2012 as Kadıköy–Kartal and was extended to Sabiha Gökçen Havalimanı in October 2022, becoming İstanbul’s Anatolian-side airport metro.
Frequently asked questions
The M4 line runs between Kadıköy and Sabiha Gökçen Havalimanı, via Gülsuyu, with 23 stations in total.
The Kadıköy – Sabiha Gökçen Havalimanı journey takes about 52 minutes, depending on the time of day.
The average frequency is about 4–8 min. Trains run between 06:00 – 00:00. Check the latest status at metro.istanbul before you travel.
A single ride with İstanbulkart is ₺42.00; transfers to other lines and public transport within 90 minutes are discounted (first transfer ₺31.27).