The flight distance from South Big Horn County Airport (GEY) in Greybull, United States to Tribhuvan International Airport (KTM) in Kathmandu, Nepal is 11,869 kilometers (7,375 miles / 6,409 nautical miles). The estimated flight time for this route is approximately 15h, flying north northwest at a heading of 348°.

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 Nepal. 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 03:00 in Greybull, it's 15:45 in Kathmandu. With a 12.75-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 Kathmandu (KTM) to Greybull (GEY) follows a heading of 10° (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 South Big Horn County Airport (GEY) and Tribhuvan International Airport (KTM) detail pages, or use our flight duration calculator to compare other routes.