The flight distance from Seattle-Tacoma International Airport (SEA) in Seattle, United States to Buyant-Ukhaa International Airport (ULN) in Ulan Bator, Mongolia is 8,406 kilometers (5,223 miles / 4,539 nautical miles). The estimated flight time for this route is approximately 11h, flying north northwest at a heading of 328°.

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 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 16:15 in Seattle, it's 08:15 in Ulan Bator. With a 16-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 3,932 feet between the two airports. Buyant-Ukhaa International Airport sits higher than Seattle-Tacoma International Airport.

The return flight from Ulan Bator (ULN) to Seattle (SEA) follows a heading of 32° (north northeast). 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 Buyant-Ukhaa International Airport (ULN) detail pages, or use our flight duration calculator to compare other routes.