The flight distance from Washington Dulles International Airport (IAD) in Washington, United States to Semnan Airport (SNX) in Semnan, Iran is 10,325 kilometers (6,415 miles / 5,575 nautical miles). The estimated flight time for this route is approximately 13h, flying northeast at a heading of 38°.

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 10:14 in Washington, it's 18:44 in Semnan. With a 8.5-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 3,353 feet between the two airports. Semnan Airport sits higher than Washington Dulles International Airport.

The return flight from Semnan (SNX) to Washington (IAD) follows a heading of 324° (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 Washington Dulles International Airport (IAD) and Semnan Airport (SNX) detail pages, or use our flight duration calculator to compare other routes.