By Taxi.

Don't worry! In good weather is almost like a lake. There aren't big waves.

Καλησπέρα σας, ρωτήστε στο ξενοδοχείο που θα μείνετε, συνεργάζονται 100% με κάποιον που κάνει τις κρουαζιέρες αυτές, για βράδυ, αν θέλετε για πρωί, έξω από την Αγία Σοφία έχεις πολλούς πλανοδιους που ψάχνουν και προσφέρουν κρουαζιέρα στο Βόσπορο..

Επίσης για την Βραδυνή κρουαζιέρα έμεινα ρωτήσαμε στο ξενοδοχείο, αυτοί συνεργαζόταν και ήρθαν και μας πήραν από το ξενοδοχείο ένα κρουπ 7 ατόμων μας πήγαν από την ευρωπαϊκή πλευρά στο λιμάνι..

When I traveled the ferry from to Kadikoy (Asian side) to Eminou (European side, near the Blue Mosque), a token cost 4TL (one way). I used my Istanbulkart, so the cost was 2,15 TL. The Istanbulkart, is a great deal, allowing travel on buses, trams, the metro, and public ferries at a bit over half price. Once you buy the card (you can get it at the airport), you can reload it at metro stations and other places with yellow kiosks (cash only!). The Kadikoy - Eminou ferries leave every 20-30 minutes. TripAdvisor guidelines prevent me from providing an URL, but I entered "Istanbul Ferries" in my web browser and found lots of information at the Turkey Travel Planner web site. Enjoy your trip!

I highly recommend the public ferry. I have used the ferry several times; several ferries leave from the Eminonou terminal, about 1.25 km from the Blue Mosque, at the foot of the hill. The T1 tram which serves the Blue Mosque area has a stop at the Eminonou terminal. The ferry runs every 20 minutes, 7 am until 1 am the following morning. No reservations are required, so it is quite flexible. There is a small snack bar on the ferry (mostly coffee), and there are lots of restaurants/cafes in Kadikoy (on the Asian side). Although the ferry is not as elegant as a cruise, it is a much cheaper alternative, one that is used by the locals. At night the harbor lights are as beautiful from the ferry as from a Cruise ship. Enjoy your trip!