Kos to Piraeus Sea Distance Calculator

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

Distance: 206.2 nm; nautical miles
Under Sail: 41 hours; at 5 knots
Under Power: 21 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: 206.2 nautical miles

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This map shows the direct sea route from Kos to Piraeus. 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 11% longer than the 185 nm direct line, its heading turning from northeast to north.

Sea distance: 206.2 nm (381.8 km)
Direct line: 185.2 nm11% longer
Great-circle bearing: 291° (west-northwest)
Sea area: Aegean Sea
Geographic extent: 1.1° × 3.7°
Crossing: Domestic · Same region
From: Kos (Greece) 36.8916, 27.2877
To: Piraeus (Greece) 37.9475, 23.6375
Route basis: Sea-lane route

Passage timeEstimated passage time by cruising speed
Cruising speed	Duration
5 kn	41 hours
8 kn	26 hours
10 kn	21 hours
12 kn	17 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 Kos to Piraeus Route

A medium ocean within one country sea route between Kos and Piraeus, this passage linking the mainland to an island anchorage in the Mediterranean region demands attention to the northerly Meltemi of high summer, which can raise short, steep seas.

The corridor between neighbouring ports of the same region joins Kos, Greece to Piraeus, Greece.

Navigation Tips

•Plan this medium ocean within one country leg in the Mediterranean region with attention to the northerly Meltemi of high summer, which can raise short, steep seas.
•Provisioning for this medium ocean passage in Mediterranean should account for regional supply networks.
•Allow time for entry formalities on this within one country leg between neighbouring ports of the same region.
•Adapt safety equipment to Mediterranean conditions for this medium ocean crossing.
•For a within one country crossing between neighbouring ports of the same region, ensure clearance papers and visas are in order before departure.

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Frequently Asked Questions

How far is it from Kos to Piraeus by sea?

This is a medium ocean sea passage of about 206.2 nautical miles between Kos and Piraeus in Mediterranean.

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

Average voyage time on this medium ocean between neighbouring ports of the same region leg of 206.2 nautical miles is 21 hours – 41 hours.

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

Aim for May-October for the calmest passage in Mediterranean; off-peak periods bring the northerly Meltemi of high summer, which can raise short, steep seas.

Plan Your Perfect Maritime Journey

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