Piraeus to Syros Sea Distance Calculator

Calculate the exact nautical distance from Piraeus, Greece to Syros, Greece. Plan your maritime journey with our professional route calculator.

Distance: 86.9 nm; nautical miles
Under Sail: 17 hours; at 5 knots
Under Power: 9 hours; at 10 knots
Best Time: May-October; Typical Sailing Season

Distance follows a sea-lane route. Sailing times are estimates at fixed cruising speeds and vary with vessel, weather, and currents.

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Distance: 86.9 nautical miles

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This map shows the direct sea route from Piraeus to Syros. The actual sailing path may vary based on weather conditions and navigation requirements.

Passage details

This is a moderately indirect inter-island route: the navigable route runs 26% longer than the 69 nm direct line, its heading turning from south to northwest.

Sea distance: 86.9 nm (161 km)
Direct line: 69.1 nm26% longer
Great-circle bearing: 116° (east-southeast)
Sea area: Aegean Sea
Geographic extent: 0.6° × 1.4°
Crossing: Domestic · Same region
From: Piraeus (Greece) 37.9475, 23.6375
To: Syros (Greece) 37.4385, 24.9421
Route basis: Sea-lane route

Passage timeEstimated passage time by cruising speed
Cruising speed	Duration
5 kn	17 hours
8 kn	11 hours
10 kn	9 hours
12 kn	7 hours

Distance follows a sea-lane route generated from marine traffic lanes; passage times are computed at fixed cruising speeds.

Read the methodology — How we calculate sea distances

Last reviewed 2026-06-17

About Piraeus to Syros Route

Linking Piraeus and Syros, this single-day crossing domestic crossing serving a major port and an island destination sits in the Mediterranean region — a passage shaped by the summer Meltemi — strong, dry northerlies that build through the afternoon.

The lane links Piraeus (Greece) and Syros (Greece), within the same maritime region.

Navigation Tips

•A single-day crossing domestic passage in the Mediterranean region typically requires planning for the summer Meltemi — strong, dry northerlies that build through the afternoon.
•A single-day crossing leg in Mediterranean benefits from waypoint planning and verified fuel availability.
•Confirm operating hours and clearance procedures for this domestic crossing within the same maritime region, since rules vary by port.
•Verify that emergency equipment matches the demands of a single-day crossing leg in Mediterranean.
•Documentation requirements differ for domestic passages within the same maritime region; verify cruising permits in advance.

More Routes from Piraeus

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Frequently Asked Questions

How far is it from Piraeus to Syros by sea?

Approximately 86.9 nautical miles separate Piraeus and Syros by sea, making this a single-day crossing leg in Mediterranean.

How long does it take to sail from Piraeus to Syros?

Expect about 9 hours – 17 hours for a single-day crossing run of 86.9 nautical miles within the same maritime region.

What's the best time to sail from Piraeus to Syros?

Peak sailing season here is May-October; year-round, Mediterranean routes contend with the summer Meltemi — strong, dry northerlies that build through the afternoon.

Plan Your Perfect Maritime Journey

Use our advanced calculator above to customize your route, add waypoints, calculate fuel costs, and share your journey plan with crew members.

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