Sea distance from Cape Town to Fremantle
The sea route from Cape Town (South Africa) to Fremantle (Australia) is about 4,880 nautical miles, which is 9,038 km or 5,616 statute miles. That is about 4% 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) | 40d 16h |
| Sailboat, average (6 kn) | 33d 21h |
| Displacement trawler (8 kn) | 25d 10h |
| Fast trawler (10 kn) | 20d 8h |
| Planing motor yacht (15 kn) | 13d 13h |
| Fast motor yacht (20 kn) | 10d 4h |
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 Fremantle 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 Fremantle from Cape Town by sea?
About 4,880 nautical miles (9,038 km / 5,616 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 Fremantle?
At a typical sailing average of 6 knots it is about 33d 21h underway. A 10-knot trawler needs about 20d 8h, and a 20-knot motor yacht about 10d 4h. 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.
Related sea distances