Stockholm to Helsinki Sea Distance Calculator

Calculate the exact nautical distance from Stockholm, Sweden to Helsinki, Finland. Plan your maritime journey with our professional route calculator.

Distance: 237.5 nm; nautical miles
Under Sail: 48 hours; at 5 knots
Under Power: 24 hours; at 10 knots
Best Time: May-September; 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: 237.5 nautical miles

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

Passage details

This is a moderately indirect coastal passage: the navigable route runs 11% longer than the 214 nm direct line, its heading turning from east-northeast to north-northeast. It is an international crossing between two countries.

Sea distance: 237.5 nm (439.9 km)
Direct line: 213.7 nm11% longer
Great-circle bearing: 73° (east-northeast)
Geographic extent: 0.9° × 6.9°
Crossing: Cross-border · Same region
From: Stockholm (Sweden) 59.3293, 18.0686
To: Helsinki (Finland) 60.1699, 24.9384
Route basis: Sea-lane route

Passage timeEstimated passage time by cruising speed
Cruising speed	Duration
5 kn	48 hours
8 kn	30 hours
10 kn	24 hours
12 kn	20 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 Stockholm to Helsinki Route

Linking Stockholm and Helsinki, this multi-day coastal cross-border crossing between two major harbours sits in the Northern Europe region — a passage shaped by persistent low cloud and reduced visibility on shoulder-season passages.

The lane links Stockholm (Sweden) and Helsinki (Finland), between neighbouring ports of the same region.

Navigation Tips

•A multi-day coastal cross-border passage in the Northern Europe region typically requires planning for persistent low cloud and reduced visibility on shoulder-season passages.
•A multi-day coastal leg in Northern Europe benefits from waypoint planning and verified fuel availability.
•Confirm operating hours and clearance procedures for this cross-border crossing between neighbouring ports of the same region, since rules vary by port.
•Verify that emergency equipment matches the demands of a multi-day coastal leg in Northern Europe.
•Documentation requirements differ for cross-border passages between neighbouring ports of the same region; verify cruising permits in advance.

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Frequently Asked Questions

How far is it from Stockholm to Helsinki by sea?

Approximately 237.5 nautical miles separate Stockholm and Helsinki by sea, making this a multi-day coastal leg in Northern Europe.

How long does it take to sail from Stockholm to Helsinki?

Expect about 24 hours – 48 hours for a multi-day coastal run of 237.5 nautical miles between neighbouring ports of the same region.

What's the best time to sail from Stockholm to Helsinki?

Peak sailing season here is May-September; year-round, Northern Europe routes contend with persistent low cloud and reduced visibility on shoulder-season passages.

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.

Plan another route with our Sea Distance Calculator Navigation Guide