Osaka to Onomichi Itozaki Sea Distance Calculator

Calculate the exact nautical distance from Osaka, Japan to Onomichi Itozaki, Japan. Plan your maritime journey with our professional route calculator.

Distance
156.5 nm
nautical miles
Under Sail
31 hours
at 5 knots
Under Power
16 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: 156.5 nautical miles
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This map shows the direct sea route from Osaka to Onomichi Itozaki. 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 34% longer than the 117 nm direct line, its heading turning from west-southwest to northeast. It spans two maritime regions.

Sea distance
156.5 nm (289.8 km)
Direct line
117 nm34% longer
Great-circle bearing
261° (west)
Geographic extent
0.6° × 2.6°
Crossing
Domestic · Cross-region
From
Osaka (Japan) 34.6937, 135.5023
To
Onomichi Itozaki (Japan) 34.3833, 133.1667
Route basis
Sea-lane route
Passage timeEstimated passage time by cruising speed
Cruising speedDuration
5 kn31 hours
8 kn20 hours
10 kn16 hours
12 kn13 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 Osaka to Onomichi Itozaki Route

Linking Osaka and Onomichi-Itozaki, this single-day crossing domestic crossing connecting two major commercial ports sits in the Pacific region — a passage shaped by long ocean swells and squall lines depending on latitude.

The lane links Osaka (Japan) and Onomichi-Itozaki (Japan), spanning two distinct maritime regions.

Navigation Tips

  • •A single-day crossing domestic passage in the Pacific region typically requires planning for long ocean swells and squall lines depending on latitude.
  • •A single-day crossing leg in Pacific benefits from waypoint planning and verified fuel availability.
  • •Confirm operating hours and clearance procedures for this domestic crossing spanning two distinct maritime regions, since rules vary by port.
  • •Verify that emergency equipment matches the demands of a single-day crossing leg in Pacific.
  • •Documentation requirements differ for domestic passages spanning two distinct maritime regions; verify cruising permits in advance.

Frequently Asked Questions

How far is it from Osaka to Onomichi Itozaki by sea?

Approximately 156.5 nautical miles separate Osaka and Onomichi Itozaki by sea, making this a single-day crossing leg in Pacific.

How long does it take to sail from Osaka to Onomichi Itozaki?

Expect about 16 hours – 31 hours for a single-day crossing run of 156.5 nautical miles spanning two distinct maritime regions.

What's the best time to sail from Osaka to Onomichi Itozaki?

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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