The flight distance from Tribhuvan International Airport (KTM) in Kathmandu, Nepal to St Clair County International Airport (PHN) in Port Huron, United States is 12,066 kilometers (7,498 miles / 6,515 nautical miles). The estimated flight time for this route is approximately 15h, flying north at a heading of 351°.

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 Nepal with United States. It is an intercontinental flight between Asia and North America. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 22:03 in Kathmandu, it's 11:18 in Port Huron. With a 10.75-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 3,740 feet between the two airports. St Clair County International Airport sits lower than Tribhuvan International Airport.

The return flight from Port Huron (PHN) to Kathmandu (KTM) follows a heading of 11° (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 Tribhuvan International Airport (KTM) and St Clair County International Airport (PHN) detail pages, or use our flight duration calculator to compare other routes.