Mykonos has two ferry ports, located about 2.5 kilometers apart: the old port and the new port.
The new port, located in Tourlos, is where all the big ferries arrive and depart from, whereas the old port now serves only itineraries on occasion.
Please note that the departure/arrival port may change at the last minute if the ferry cannot dock due to adverse weather conditions or other reasons. Therefore, we recommend that you re-confirm with the port authorities (+30 22890 22218) to verify where your ferry will be departing from/arriving.
You can find more information about Mykonos and its ports on our blog.