Brest to Saint-Nazaire — sea route & marine weather
The sea route from Brest (FRBES) to Saint-Nazaire (FRSNR) is about 153 nm — about 15 hours at 10 kn. Along the route today (Nov 2): NE wind 8–15 kn, waves 0.6–1.8 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 153 nm |
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| Passage time at 10 kn | about 15 hours |
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| Great-circle distance | 114 nm |
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| Brest | 48°24.0′N 4°29.0′W |
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| Saint-Nazaire | 47°17.0′N 2°12.0′W |
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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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| NE 8–15 kn | 24 kn | 0.6–1.8 m |
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| NE 8–15 kn | 24 kn | 0.5–1.8 m |
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| ENE 8–13 kn | 20 kn | 0.5–1.4 m |
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| ENE 4–9 kn | 15 kn | 0.6–1.1 m |
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| ESE 1–5 kn | 10 kn | 0.4–0.9 m |
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| SE 0–6 kn | 7 kn | 0.4–0.8 m |
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| ESE 4–11 kn | 14 kn | 0.5–1.0 m |
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| ESE 9–17 kn | 25 kn | 1.2–1.4 m |
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| SE 8–15 kn | 22 kn | 1.4–1.6 m |
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| ESE 4–7 kn | 13 kn | 1.5–1.5 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 Brest to Saint-Nazaire by sea?
The water route is 153 nm (284 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Saint-Nazaire to Brest.
How long does the passage from Brest to Saint-Nazaire take?
about 15 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 Brest and Saint-Nazaire today?
Along the route today, per the ECMWF IFS run 2026-11-02 12z: NE wind 8–15 kn, waves 0.6–1.8 m. The day-by-day table on this page covers the next 10 days.