The flight distance from Colombo Int Arpt Ratmalana Airport (RML) in Colombo, Sri Lanka to Seattle-Tacoma International Airport (SEA) in Seattle, United States is 13,598 kilometers (8,449 miles / 7,342 nautical miles). The estimated flight time for this route is approximately 17h, flying north northeast at a heading of 18°.

This is an ultra-long-haul route, one of the longest in aviation. It requires wide-body aircraft with extended range capability such as the Airbus A350-900ULR or Boeing 777-200LR. Passengers should prepare for an extended flight with multiple meal services.

This is an international route connecting Sri Lanka with United States. It is an intercontinental flight between Asia and North America. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 15:05 in Colombo, it's 01:35 in Seattle. With a 13.5-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

The return flight from Seattle (SEA) to Colombo (RML) follows a heading of 334° (north northwest). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Colombo Int Arpt Ratmalana Airport (RML) and Seattle-Tacoma International Airport (SEA) detail pages, or use our flight duration calculator to compare other routes.