Busan to Onomichi Itozaki Sea Distance Calculator

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

Distance
258.3 nm
nautical miles
Under Sail
2.2 days
at 5 knots
Under Power
26 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: 258.3 nautical miles
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This map shows the direct sea route from Busan 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 25% longer than the 207 nm direct line, its heading turning from south-southeast to northeast. It is an international crossing between two countries. It spans two maritime regions.

Sea distance
258.3 nm (478.3 km)
Direct line
207.3 nm25% longer
Great-circle bearing
102° (east-southeast)
Geographic extent
1.5° × 4.1°
Crossing
Cross-border · Cross-region
From
Busan (South Korea) 35.1796, 129.0756
To
Onomichi Itozaki (Japan) 34.3833, 133.1667
Route basis
Sea-lane route
Passage timeEstimated passage time by cruising speed
Cruising speedDuration
5 kn2.2 days
8 kn32 hours
10 kn26 hours
12 kn22 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 Busan to Onomichi Itozaki Route

The maritime route from Busan to Onomichi-Itozaki is a overnight offshore international passage connecting two major commercial ports in the Pacific region. Mariners on this leg typically prepare for the western Pacific typhoon season July through October.

This route runs spanning two distinct maritime regions, connecting Busan in South Korea with Onomichi-Itozaki in Japan.

Navigation Tips

  • •On this overnight offshore international crossing in the Pacific region, prepare for the western Pacific typhoon season July through October, particularly in peak season.
  • •For a overnight offshore route, plan fuel and provisioning around the Pacific region — calculate consumption with our tool.
  • •Verify port-entry requirements at both ends of this international route spanning two distinct maritime regions before you depart.
  • •Check safety gear suited to Pacific conditions before a overnight offshore passage — life rafts, EPIRB, and current charts.
  • •Carry passports, vessel documents, and crew lists matched to this international route spanning two distinct maritime regions.

Frequently Asked Questions

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

The sea distance from Busan to Onomichi Itozaki is approximately 258.3 nautical miles — a overnight offshore passage in Pacific.

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

A overnight offshore spanning two distinct maritime regions crossing of 258.3 nautical miles typically takes 1.1 days – 2.2 days, depending on vessel and weather.

What's the best time to sail from Busan 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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