Is Istanbul Card valid for fast ferries and sea buses on outer lines? IDO Istanbul Card is valid only on our sea buses domestic lines and car ferry lines (on foot journeys). As our outer trips are ticketed lines, tickets must be purchased in advance. 15 June 2022 07:48 Updated Contact Us Online Assistant Click to chat now Submit Request Click to submit your request 0850 532 62 58 Related articles Is the driver included in the car ticket price? What is the difference between a fast ferry and a sea bus? The bus has not arrived yet/has been delayed, what can I do? Are children charged? How can I cancel my bus ticket?