The flight distance from RAF Ascension Island (ASI) in Ascension Island, SH to Seattle-Tacoma International Airport (SEA) in Seattle, United States is 12,004 kilometers (7,459 miles / 6,481 nautical miles). The estimated flight time for this route is approximately 15h, flying northwest at a heading of 317°.

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 SH with United States. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 07:24 in Ascension Island, it's 23:24 in Seattle. With a 8-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 Ascension Island (ASI) follows a heading of 82° (east). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

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