Seattle to Cape Town shipping route.

Ships leaving Seattle for Cape Town head east and cover a sea distance of 10,771 nautical miles (19,948 km), via Panama Canal. The straight line between the ports is 16,428 km; coastlines and shipping lanes add the rest. On the way the vessel passes Panama Canal, so canal transit fees and waiting time at the canal are part of every voyage.

Shipping time depends on speed. At 14 knots, a common container ship service speed, the passage takes 32.1 days at sea. Slow steaming at 12 knots stretches it to 37.4 days, while 18 knots brings it down to 24.9. Container transit time on a liner service is longer than the steaming time: ships call at other ports on the rotation, and cargo may transship at a hub. Add terminal time at Seattle and Cape Town to plan the full ocean transit time.

The next option is via Strait of Magellan, 11,057 nautical miles, 286 nm longer than the main route. Carriers pick it when Strait of Magellan is congested or closed.

1,267 nm of the route, 12% of it, lies inside North American ECA. In an emission control area ships must burn fuel with no more than 0.1% sulphur or clean the exhaust with scrubbers. That fuel costs more, and carriers add it to the ocean freight bill as a low sulphur or ECA surcharge.

Container freight rates on Seattle to Cape Town move with fuel prices, ship capacity and the season. Compare several carriers before booking: the cheapest sailing is often the slowest one. At Cape Town (ZACPT) carriers give about 3 free days before demurrage and detention charges start, so plan the truck or rail pickup before the box lands.

Of the 64 port to port routes from Seattle in this directory, Cape Town is the 60th shortest. Closer destinations include Jebel Ali (10,667 nm), Salalah (10,550 nm) and Mersin (10,542 nm).