Besides the fast ferries to Yalova from Istanbul's Yenikapı Feribot Terminalı, there is also a shorter, faster, more frequent car-and-passenger ferry service from Istanbul's Asian suburb of Pendik to Yalova (map). Ferries operate up to 14 times daily in summer, and the voyage takes only 45 minutes.
This would be your better choice if you find yourself on the Asian side of the Bosphorus. You can go from Kadıköyto Pendik by İETT city bus No. 16, 16D or 222; or take the Metro from Kadıköy to Kartal, then bus KM20 to Pendik.
(An alternative would be the İDOBus fast ferry from Istanbul's Kabataş docks, stopping in Kadıköy on its way to Bursa's Güzelyalı docks. More...)
Fares from Pendik to Yalova are in several classes and are priced dynamically, like airfares, meaning that fares purchased in advance, or for less popular sailings, may be lower, and those purchased at the last minute, or for popular departures (such as on weekends and holidays), or which are refundable, may be higher.
These ferries are operated by İDO (İstanbul Deniz Otobüsleri A Ş). You can make reservations and buy your ferry tickets online, in English, but the procedure is fairly complicated and may not work. Here's how...
OTHER SEA OF MARMARA
Istanbul (Yenikapı) - Yalova Ferries
This is the most convenient service if you're starting from the European center of Istanbul: ferries depart about every two hours from 09:30 am to 21:30 (9:30 pm). More...
Istanbul - Bursa Ferries
Car-and-passenger feribots connect Güzelyalı, near Bursa, with Istanbul's Yenikapı Ferry Terminal, departing five times daily, making the voyage in 75 minutes. More...
İDOBus passenger-only ferries zoom from Istanbul's Kabataş docks to Güzelyalı as well. More...
Istanbul - Bandırma Ferries
Ferries depart between three and six times daily on the 2-hour voyage, depending on the season and the day of the week. More...
Frequent car ferries cross the Dardanelles between Gelibolu and Lapseki, and Eceabat and Çanakkale. More...
İstanbul Deniz Otobüsleri A Ş
Kennedy Caddesi, Yenikapı Hızlı Feribot İskelesi
34480 Fatih, Istanbul, Turkey
Call Center: +90 444 44 36
Tel: +90 (212) 455 6900
Fax: +90 (212) 517 3958