This route is operated by Blue Star Ferries, Seajets and Zante Ferries. The quickest crossing is with Seajets and lasts 20 minutes.
Serifos and Sifnos are close with a distance of only 22 kilometres between them, that's about 14 miles or 12 nautical miles if you take a direct route.
You can travel as a foot passenger or with your vehicle on this route.
The cheapest price for a one way crossing by foot in the summer is about 6 euros, and for a car with one person about 21.50 eurosClick Book Now and use the booking form to get the latest prices and see the real sailing dates for all ferries on the Serifos - Sifnos route.
Seajets is not worth the money. Next time I'll stick to Zante ferries or Blu star.