Paros and Syros are about 23 nautical miles apart, and this is one of the handiest links in the central Cyclades. Paros is the busy hub, with Naoussa's harbour, long beaches and ferries in every direction. Syros is the working capital of the Cyclades: its port town, Ermoupoli, is a grand neoclassical place with a lively harbour front and the old Catholic quarter of Ano Syros on the hill.
Travellers take this crossing to add a city-like island to a beach trip, to reach Syros for its year-round links to Piraeus, Tinos and Mykonos, or simply to find calmer, better-value rooms after peak-season Paros. It also works as the first step on a loop north towards Tinos and Andros.
The key thing to know is the price gap. The conventional Blue Star ship costs just €7 and runs on several days a week all year. The Seajets high-speed boats cost roughly eight to nine times as much and are not always faster: on our 12 August 2026 sample, one took 45 minutes and the other 1 hr 30 min. Unless you are short of time, the Blue Star sailing is the obvious choice.
If you are driving, this is also a cheap route for a car: two adults with a car started at €33 when we checked. Book early in summer, and be at Parikia port an hour before sailing if you have a vehicle.