Boston to Philadelphia Sea Distance Calculator

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

Distance
436.3 nm
nautical miles
Under Sail
3.6 days
at 5 knots
Under Power
44 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.

Interactive Route Map

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Distance: 436.3 nautical miles
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This map shows the direct sea route from Boston to Philadelphia. The actual sailing path may vary based on weather conditions and navigation requirements.

Passage details

This is a markedly indirect coastal passage: the navigable route runs 86% longer than the 234 nm direct line, its heading turning from east to northeast.

Sea distance
436.3 nm (808 km)
Direct line
234.2 nm86% longer
Great-circle bearing
233° (southwest)
Geographic extent
3.6° × 5.1°
Crossing
Cross-border · Same region
From
Boston (United States) 42.3601, -71.0589
To
Philadelphia (United States) 39.9500, -75.1333
Route basis
Sea-lane route
Passage timeEstimated passage time by cruising speed
Cruising speedDuration
5 kn3.6 days
8 kn2.3 days
10 kn44 hours
12 kn36 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 Philadelphia Route

Linking Boston and Philadelphia, this multi-day coastal international crossing connecting two major commercial ports 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 Philadelphia (United States), within the same maritime region.

Navigation Tips

  • •A multi-day coastal international 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 international crossing within the same maritime 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 international passages within the same maritime region; verify cruising permits in advance.

Frequently Asked Questions

How far is it from Boston to Philadelphia by sea?

Approximately 436.3 nautical miles separate Boston and Philadelphia by sea, making this a multi-day coastal leg in North America.

How long does it take to sail from Boston to Philadelphia?

Expect about 1.8 days – 3.6 days for a multi-day coastal run of 436.3 nautical miles within the same maritime region.

What's the best time to sail from Boston to Philadelphia?

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.

Plan another route with our Sea Distance CalculatorNavigation Guide