The flight distance from Henry Post Army Air Field (Fort Sill) Airport (FSI) in Fort Sill, United States to Incheon International Airport (ICN) in Seoul, South Korea is 10,755 kilometers (6,683 miles / 5,807 nautical miles). The estimated flight time for this route is approximately 14h, flying northwest at a heading of 326°.

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 South Korea. 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 20:44 in Fort Sill, it's 11:44 in Seoul. With a 15-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 1,165 feet between the two airports. Incheon International Airport sits lower than Henry Post Army Air Field (Fort Sill) Airport.

The return flight from Seoul (ICN) to Fort Sill (FSI) follows a heading of 36° (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 Henry Post Army Air Field (Fort Sill) Airport (FSI) and Incheon International Airport (ICN) detail pages, or use our flight duration calculator to compare other routes.