The flight distance from Washington Dulles International Airport (IAD) in Washington, United States to Buyant-Ukhaa International Airport (ULN) in Ulan Bator, Mongolia is 10,361 kilometers (6,438 miles / 5,594 nautical miles). The estimated flight time for this route is approximately 13h, flying north at a heading of 357°.

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 Mongolia. 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 21:33 in Washington, it's 09:33 in Ulan Bator. 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.

There is a significant elevation difference of 4,052 feet between the two airports. Buyant-Ukhaa International Airport sits higher than Washington Dulles International Airport.

The return flight from Ulan Bator (ULN) to Washington (IAD) follows a heading of 3° (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 Buyant-Ukhaa International Airport (ULN) detail pages, or use our flight duration calculator to compare other routes.