Boston to Canaport St John Sea Distance Calculator

Calculate the exact nautical distance from Boston, United States to Canaport St John, Canada. Plan your maritime journey with our professional route calculator.

Distance
305.4 nm
nautical miles
Under Sail
2.5 days
at 5 knots
Under Power
31 hours
at 10 knots
Best Time
Varies by area
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: 305.4 nautical miles
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This map shows the direct sea route from Boston to Canaport St John. The actual sailing path may vary based on weather conditions and navigation requirements.

Passage details

This is a near-direct coastal passage: the navigable route runs 10% longer than the 278 nm direct line, its heading turning from east to east-southeast. It is an international crossing between two countries.

Sea distance
305.4 nm (565.7 km)
Direct line
278.3 nm10% longer
Great-circle bearing
50° (northeast)
Geographic extent
2.9° × 5.1°
Crossing
Cross-border · Same region
From
Boston (United States) 42.3601, -71.0589
To
Canaport St John (Canada) 45.2000, -65.9833
Route basis
Sea-lane route
Passage timeEstimated passage time by cruising speed
Cruising speedDuration
5 kn2.5 days
8 kn38 hours
10 kn31 hours
12 kn25 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 Boston to Canaport St John Route

Linking Boston and Canaport (St. John), this multi-day coastal cross-border crossing between two major harbours sits in the North America region — a passage shaped by tropical storm and hurricane activity from roughly June through November in the affected coastal waters.

The lane links Boston (United States) and Canaport (St. John) (Canada), between neighbouring ports of the same region.

Navigation Tips

  • •A multi-day coastal cross-border passage in the North America region typically requires planning for tropical storm and hurricane activity from roughly June through November in the affected coastal waters.
  • •A multi-day coastal leg in North America 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 North America.
  • •Documentation requirements differ for cross-border passages between neighbouring ports of the same region; verify cruising permits in advance.

Frequently Asked Questions

How far is it from Boston to Canaport St John by sea?

Approximately 305.4 nautical miles separate Boston and Canaport St John by sea, making this a multi-day coastal leg in North America.

How long does it take to sail from Boston to Canaport St John?

Expect about 1.3 days – 2.5 days for a multi-day coastal run of 305.4 nautical miles between neighbouring ports of the same region.

What's the best time to sail from Boston to Canaport St John?

Conditions on this route vary by area and season, so there is no single best time that applies along its whole length. Always check current weather forecasts and sea conditions before departure.

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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