The website of Athens International Airport, www.aia.gr, is a useful resource for domestic airline schedules. Olympic Air (tel. 810/114-4444 or 210/966-6666, official Greek phone numbers that are rarely answered; www.olympicair.com) offers daily flights between Athens and Siros, which also gets European charters. Aegean Airlines (tel. 810/112-0000; www.aegeanair.com) also plans to start service between Athens and Siros. Buses from the airport to nearby Ermoupolis run frequently (4€); a taxi costs about 10€. A bus from the airport meets most flights; the schedule is posted at the bus stop, beside the airport entrance. A taxi to Fira costs about 13€.
The websites www.gtp.gr and www.openseas.gr are useful resources for ferry schedules. Ferries connect Siros at least once daily with Piraeus, Naxos, Mykonos, Paros, Tinos, and Santorini. The ferries connect once or twice weekly with Folegandros, Sifnos, Iraklion, Samos, and Thessaloniki (12-15 hr.). There is service in summer from Rafina. Boats are notoriously late and/or early; your travel or ticket agent will give you an estimate of times involved in the following journeys. Remember: You'll find numerous ferry-ticket offices on the harborfront: Alpha Syros (tel. 22810/81-185), opposite the ferry pier, and its sister company, Teamwork Holidays (tel. 22810/83-400; www.teamwork.gr), sell tickets for all the ferries (and also handle plane tickets and hotel reservations). Ferry information can be verified with the Ermoupolis port authority (tel. 22810/88-888 or 22810/82-690).
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.