Colombo to Seattle shipping route.

The shipping route from Colombo, Sri Lanka to Seattle, United States covers 8,770 nautical miles port to port, via Strait of Malacca. On a globe the two ports sit 13,572 km apart, so the ship sails 1.20 times the straight line distance. On the way the vessel passes Strait of Malacca.

Pure steaming time is 26.1 days at 14 knots. A carrier that slow steams at 12 knots to save fuel needs 30.5 days, and a fast 18 knot string about 20.3. 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 Colombo and Seattle to plan the full ocean transit time.

The next option is via Sunda Strait, 9,367 nautical miles, 597 nm longer than the main route. Carriers pick it when Sunda Strait is congested or closed.

548 nm of the route, 6% 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 Colombo to Seattle move with fuel prices, ship capacity and the season. Compare several carriers before booking: the cheapest sailing is often the slowest one. At Seattle (USSEA) carriers give about 3.94 free days before demurrage and detention charges start, so plan the truck or rail pickup before the box lands.

Of the 65 port to port routes from Colombo in this directory, Seattle is the 55th shortest. Closer destinations include Montreal (8,731 nm), New York (8,637 nm) and Buenos Aires (8,268 nm).