The flight distance from Seattle-Tacoma International Airport (SEA) in Seattle, United States to Semnan Airport (SNX) in Semnan, Iran is 10,772 kilometers (6,693 miles / 5,816 nautical miles). The estimated flight time for this route is approximately 14h, flying north at a heading of 3°.

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

Time zone information: When it's 00:51 in Seattle, it's 12:21 in Semnan. With a 11.5-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 3,233 feet between the two airports. Semnan Airport sits higher than Seattle-Tacoma International Airport.

The return flight from Semnan (SNX) to Seattle (SEA) follows a heading of 357° (north). 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 Semnan Airport (SNX) detail pages, or use our flight duration calculator to compare other routes.