The flight distance from Seattle-Tacoma International Airport (SEA) in Seattle, United States to Sion Airport (SIR) in Sion, Switzerland is 8,507 kilometers (5,286 miles / 4,593 nautical miles). The estimated flight time for this route is approximately 11h, flying north northeast at a heading of 33°.

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

Time zone information: When it's 05:25 in Seattle, it's 14:25 in Sion. With a 9-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 1,153 feet between the two airports. Sion Airport sits higher than Seattle-Tacoma International Airport.

The return flight from Sion (SIR) to Seattle (SEA) follows a heading of 328° (north 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 Sion Airport (SIR) detail pages, or use our flight duration calculator to compare other routes.