The flight distance from Cassilandia Airport (CSS) in Cassilandia, Brazil to Seattle-Tacoma International Airport (SEA) in Seattle, United States is 10,197 kilometers (6,336 miles / 5,506 nautical miles). The estimated flight time for this route is approximately 13h, flying northwest at a heading of 320°.

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

Time zone information: When it's 12:52 in Cassilandia, it's 08:52 in Seattle. The 4-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

There is a significant elevation difference of 1,136 feet between the two airports. Seattle-Tacoma International Airport sits lower than Cassilandia Airport.

The return flight from Seattle (SEA) to Cassilandia (CSS) follows a heading of 117° (east southeast). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

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