Osaka to Nagasaki — sea route & marine weather
The sea route from Osaka (JPOSA) to Nagasaki (JPNGS) is about 439 nm — about 44 hours at 10 kn. Along the route today (Sep 14): ENE wind 0–14 kn, waves 0.2–1.0 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 439 nm |
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| Passage time at 10 kn | about 44 hours |
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| Great-circle distance | 303 nm |
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| Osaka | 34°39.0′N 135°26.0′E |
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| Nagasaki | 32°43.0′N 129°51.0′E |
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| Reference vessel | 4.5 m draft, 10 kn cruise |
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10-day marine forecast — along the route
| Date | Wind | Gusts | Waves |
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| ENE 0–14 kn | 20 kn | 0.2–1.0 m |
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| NE 2–19 kn | 25 kn | 0.2–1.6 m |
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| NE 1–24 kn | 33 kn | 0.3–2.2 m |
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| ENE 1–24 kn | 31 kn | 0.2–2.3 m |
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| NE 2–21 kn | 27 kn | 0.2–1.7 m |
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| NE 3–22 kn | 28 kn | 0.6–2.0 m |
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| NE 6–22 kn | 27 kn | 0.9–2.6 m |
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| NE 6–22 kn | 32 kn | 0.8–3.5 m |
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| NNE 13–28 kn | 40 kn | 1.2–4.4 m |
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| N 9–23 kn | 34 kn | 0.8–3.2 m |
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Forecast from the ECMWF IFS model run , waves from ECMWF WAM. Updated with each model cycle; the live chart below recalculates for your departure time and vessel.
Frequently asked
How far is it from Osaka to Nagasaki by sea?
The water route is 439 nm (813 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Nagasaki to Osaka.
How long does the passage from Osaka to Nagasaki take?
about 44 hours at a 10 kn cruise. Scale by your own speed: at half the speed it takes about twice as long. The planner on this page recalculates for your vessel and live weather.
What is the weather between Osaka and Nagasaki today?
Along the route today, per the ECMWF IFS run 2026-09-14 00z: ENE wind 0–14 kn, waves 0.2–1.0 m. The day-by-day table on this page covers the next 10 days.