The flight distance from Boundary Airport (BYA) in Boundary, United States to Tribhuvan International Airport (KTM) in Kathmandu, Nepal is 9,038 kilometers (5,616 miles / 4,880 nautical miles). The estimated flight time for this route is approximately 12h, flying northwest at a heading of 320°.

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 21:58 in Boundary, it's 11:43 in Kathmandu. With a 13.75-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 1,450 feet between the two airports. Tribhuvan International Airport sits higher than Boundary Airport.

The return flight from Kathmandu (KTM) to Boundary (BYA) follows a heading of 19° (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 Boundary Airport (BYA) and Tribhuvan International Airport (KTM) detail pages, or use our flight duration calculator to compare other routes.