The flight distance from Onslow Airport (ONS) in Onslow Airport, Australia to Seattle-Tacoma International Airport (SEA) in Seattle, United States is 14,191 kilometers (8,818 miles / 7,662 nautical miles). The estimated flight time for this route is approximately 18h, flying northeast at a heading of 46°.

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

Time zone information: When it's 04:31 in Onslow Airport, it's 13:31 in Seattle. With a 15-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 Onslow Airport (ONS) follows a heading of 279° (west). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

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