The flight distance from Seattle-Tacoma International Airport (SEA) in Seattle, United States to Marechal Cunha Machado International Airport (SLZ) in Sao Luis, Brazil is 9,329 kilometers (5,797 miles / 5,037 nautical miles). The estimated flight time for this route is approximately 12h, flying east at a heading of 101°.

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 United States with Brazil. It is an intercontinental flight between North America and South America. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 21:11 in Seattle, it's 02:11 in Sao Luis. The 5-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

The return flight from Sao Luis (SLZ) to Seattle (SEA) follows a heading of 318° (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 Seattle-Tacoma International Airport (SEA) and Marechal Cunha Machado International Airport (SLZ) detail pages, or use our flight duration calculator to compare other routes.