The flight distance from Washington Dulles International Airport (IAD) in Washington, United States to Roi Et Airport (ROI) in Roi Et Airport, Thailand is 13,896 kilometers (8,634 miles / 7,503 nautical miles). The estimated flight time for this route is approximately 17h, flying north at a heading of 359°.

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 Thailand. 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 11:25 in Washington, it's 23:25 in Roi Et Airport. With a 12-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 Roi Et Airport (ROI) to Washington (IAD) follows a heading of 1° (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 Washington Dulles International Airport (IAD) and Roi Et Airport (ROI) detail pages, or use our flight duration calculator to compare other routes.