The flight distance from St Mary's Airport (KSM) in St Mary'S, United States to Tribhuvan International Airport (KTM) in Kathmandu, Nepal is 8,334 kilometers (5,178 miles / 4,500 nautical miles). The estimated flight time for this route is approximately 11h, flying west northwest at a heading of 301°.

This is a long-haul route typically operated by wide-body aircraft such as the Boeing 777 or Airbus A350. Full meal service, in-flight entertainment, and comfort amenities are standard.

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 06:24 in St Mary'S, it's 21:09 in Kathmandu. With a 14.75-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 4,076 feet between the two airports. Tribhuvan International Airport sits higher than St Mary's Airport.

The return flight from Kathmandu (KTM) to St Mary'S (KSM) follows a heading of 27° (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 St Mary's Airport (KSM) and Tribhuvan International Airport (KTM) detail pages, or use our flight duration calculator to compare other routes.