The flight distance from Tribhuvan International Airport (KTM) in Kathmandu, Nepal to Los Alamos Airport (LAM) in Los Alamos, United States is 12,841 kilometers (7,979 miles / 6,934 nautical miles). The estimated flight time for this route is approximately 16h, flying north at a heading of 10°.

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 14:25 in Kathmandu, it's 01:40 in Los Alamos. 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.

There is a significant elevation difference of 2,781 feet between the two airports. Los Alamos Airport sits higher than Tribhuvan International Airport. Travelers arriving at the higher-elevation airport should be aware of potential altitude effects.

The return flight from Los Alamos (LAM) to Kathmandu (KTM) follows a heading of 349° (north northwest). 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 Los Alamos Airport (LAM) detail pages, or use our flight duration calculator to compare other routes.