The flight distance from Cascais Airport (CAT) in Cascais Airport, Portugal to Seattle-Tacoma International Airport (SEA) in Seattle, United States is 8,363 kilometers (5,197 miles / 4,516 nautical miles). The estimated flight time for this route is approximately 11h, flying northwest at a heading of 320°.

This is a long-haul route typically operated by wide-body aircraft such as the Boeing 777 or Airbus A350. Full meal service, in-flight entertainment, and comfort amenities are standard.

This is an international route connecting Portugal with United States. It is an intercontinental flight between Europe and North America. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 05:46 in Cascais Airport, it's 21:46 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 Cascais Airport (CAT) follows a heading of 48° (northeast). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

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