Kos to Marmaris Sea Distance Calculator

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

Distance: 84.9 nm; nautical miles
Under Sail: 17 hours; at 5 knots
Under Power: 8 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: 84.9 nautical miles

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

Passage details

This is a markedly indirect inter-island route: the navigable route runs 80% longer than the 47 nm direct line, its heading turning from northeast to north-northeast. It is an international crossing between two countries.

Sea distance: 84.9 nm (157.2 km)
Direct line: 47.2 nm80% longer
Great-circle bearing: 93° (east)
Sea area: Aegean Sea
Geographic extent: 0.4° × 1.0°
Crossing: Cross-border · Same region
From: Kos (Greece) 36.8916, 27.2877
To: Marmaris (Turkey) 36.8511, 28.2700
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	8 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 Kos to Marmaris Route

A medium-length coastal cross-border sea route between Kos and Marmaris, this passage on a coastal route 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 Marmaris, Turkey.

Navigation Tips

•Plan this medium-length coastal cross-border leg in the Mediterranean region with attention to the northerly Meltemi of high summer, which can raise short, steep seas.
•Provisioning for this medium-length coastal passage in Mediterranean should account for regional supply networks.
•Allow time for entry formalities on this cross-border leg between neighbouring ports of the same region.
•Adapt safety equipment to Mediterranean conditions for this medium-length coastal crossing.
•For a cross-border 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 Marmaris by sea?

This is a medium-length coastal sea passage of about 84.9 nautical miles between Kos and Marmaris in Mediterranean.

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

Average voyage time on this medium-length coastal between neighbouring ports of the same region leg of 84.9 nautical miles is 8 hours – 17 hours.

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

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.

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