Piraeus to Mykonos is the main sea link between Athens and the island most visitors have on their list. It is a straightforward trip: you board in the capital's big port in the morning and are on a Mykonos beach by the afternoon. Blue Star Ferries keeps the route going every day of the year, and in the warmer months Seajets adds fast boats that cut the journey almost in half.
Piraeus is Athens' main port, a large and busy harbour south of the city centre, reached by metro, suburban railway, bus or taxi. At the other end you arrive at the new port of Mykonos in Tourlos, about 2.5 km from Mykonos Town, where buses, taxis and hotel transfers wait for the ships.
In a trip plan, this crossing usually opens an island-hopping route: Athens first, then Mykonos, then south to Naxos, Paros or Santorini. Many people also combine it with the ferry from Rafina, which is closer to Athens airport. If you land at the airport and want to sail the same day, compare both ports before booking.
The key decision is speed against price. A Blue Star deck ticket costs much less than a Seajets seat, but takes roughly two hours longer. Book early for July and August, when both the ferries and Mykonos hotels are at their busiest, and give yourself plenty of time to get across Athens to the right gate at Piraeus.