Please check the ferry timetables on the websites.
Ticket of the regular ferry to the Princes' Islands: 3.50 TL with IstanbulCard, 5 TL with token
Fast ferry tickets: from Kabataş (European side): 7.10 TL with IstanbulCard, 9 TL with token
From Bostancı (Asian side): 4.25 TL with IstanbulCard, 5.50 TL with token
Адрес 18 Büyük Çamlık Yolu, 34975, Turkey
Координаты 40°52'47.843" N 29°3'43.856" E