The flight distance from Tribhuvan International Airport (KTM) in Kathmandu, Nepal to Washington County Airport (WSG) in Washington, United States is 12,327 kilometers (7,660 miles / 6,656 nautical miles). The estimated flight time for this route is approximately 16h, 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 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 04:36 in Kathmandu, it's 18:51 in Washington. With a 9.75-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 3,206 feet between the two airports. Washington County Airport sits lower than Tribhuvan International Airport.

The return flight from Washington (WSG) to Kathmandu (KTM) follows a heading of 14° (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 Washington County Airport (WSG) detail pages, or use our flight duration calculator to compare other routes.