The flight distance from Tribhuvan International Airport (KTM) in Kathmandu, Nepal to Samui Airport (USM) in Na Thon (Ko Samui Island), Thailand is 2,539 kilometers (1,577 miles / 1,371 nautical miles). The estimated flight time for this route is approximately 4h, flying southeast at a heading of 140°.

This is a medium-haul route that may be operated by either narrow-body or wide-body aircraft depending on demand. Passengers can expect a meal service on most carriers.

This is an international route connecting Nepal with Thailand. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 07:46 in Kathmandu, it's 09:01 in Na Thon (Ko Samui Island).

There is a significant elevation difference of 4,326 feet between the two airports. Samui Airport sits lower than Tribhuvan International Airport.

The return flight from Na Thon (Ko Samui Island) (USM) to Kathmandu (KTM) follows a heading of 325° (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 Samui Airport (USM) detail pages, or use our flight duration calculator to compare other routes.