The flight distance from Seattle-Tacoma International Airport (SEA) in Seattle, United States to Thaba-Tseka Airport (THB) in Thaba-Tseka, Lesotho is 16,826 kilometers (10,455 miles / 9,085 nautical miles). The estimated flight time for this route is approximately 21h, flying east northeast at a heading of 62°.

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 Lesotho. It is an intercontinental flight between North America and Africa. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 02:20 in Seattle, it's 12:20 in Thaba-Tseka. With a 10-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

There is a significant elevation difference of 7,068 feet between the two airports. Thaba-Tseka Airport sits higher than Seattle-Tacoma International Airport. Travelers arriving at the higher-elevation airport should be aware of potential altitude effects.

The return flight from Thaba-Tseka (THB) to Seattle (SEA) follows a heading of 317° (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 Thaba-Tseka Airport (THB) detail pages, or use our flight duration calculator to compare other routes.