The cheapest way in. Nothing listed is quicker.
M4 metro to Kadıköy
M4 · Metro İstanbul, fare set by İBBPickup, hours & luggage
Boards at. Sabiha Gökçen Havalimanı station, the last stop on the M4. Buy or top up the İstanbulkart before the gates
TRY 46.20 on an İstanbulkart, the flat first-boarding fare. A bank card or phone tapped on the gate, or a single-use ticket, pays TRY 65. Children pay from age seven; there is no group ticket. Changing to the Marmaray or a bus on the same card is a TRY 34.40 transfer, not a second full fare. Between 00:30 and 05:30 on Friday and Saturday nights every fare doubles.
Luggage. One large suitcase, up to 30 kg and 120 x 60 x 50 cm, plus a cabin bag or small backpack, free. A second suitcase costs one more fare. Ordinary metro cars without racks.
Hours. Every day, every 4 to 10 minutes. On Friday and Saturday nights the line keeps running — every 30 minutes from 00:30 to 05:30, at double fare — so there is no gap those two nights. Sunday to Thursday nothing runs between 23:59 and 06:00.