Sea distance from Cape Town to Sydney
The sea route from Cape Town (South Africa) to Sydney (Australia) is about 6,473 nautical miles, which is 11,988 km or 7,449 statute miles. That is about 9% longer than the direct great-circle line, because the practical route follows coastlines and shipping lanes.
Voyage time by boat speed
Time underway is distance divided by speed. These are continuous-passage figures with no stops or weather margin.
| Boat and speed | Time underway |
|---|---|
| Sailboat, conservative (5 kn) | 53d 23h |
| Sailboat, average (6 kn) | 44d 23h |
| Displacement trawler (8 kn) | 33d 17h |
| Fast trawler (10 kn) | 26d 23h |
| Planing motor yacht (15 kn) | 18d 0h |
| Fast motor yacht (20 kn) | 13d 12h |
Planning estimate, not navigation
This distance is computed over the open Eurostat shipping-lane network. It is a realistic passage length for planning, but your sailed distance will differ with weather routing, currents, draft, and the exact berths you leave from and arrive at. Always verify against official charts.
Building with these numbers? The sea route & distance API returns this figure, voyage time, and route geometry for any port pair in one GET request.
Plan this passage properly
Open Cape Town to Sydney in the Marine OS route planner: it suggests the sea route, then you drag waypoints, set your speed and fuel burn, and check weather and tides along the way.
Open this route in the plannerFrequently asked questions
How far is Sydney from Cape Town by sea?
About 6,473 nautical miles (11,988 km / 7,449 statute miles) along the practical sea route. The straight-line distance is shorter, but boats follow coastlines, channels, and traffic lanes.
How long does it take to sail from Cape Town to Sydney?
At a typical sailing average of 6 knots it is about 44d 23h underway. A 10-knot trawler needs about 26d 23h, and a 20-knot motor yacht about 13d 12h. Add margin for weather, currents, and stops.
How is this distance calculated?
It is computed over the open Eurostat global shipping-lane network, the same kind of network freight routing tools use. It is a realistic planning estimate, not a navigation product: your sailed distance will vary with weather routing, draft, and the exact harbors you use.
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