The flight distance from Denver International Airport (DEN) in Denver, United States to Samui Airport (USM) in Na Thon (Ko Samui Island), Thailand is 13,959 kilometers (8,674 miles / 7,537 nautical miles). The estimated flight time for this route is approximately 17h, flying north northwest at a heading of 330°.

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 United States with Thailand. 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 03:48 in Denver, it's 17:48 in Na Thon (Ko Samui Island). With a 14-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 5,370 feet between the two airports. Samui Airport sits lower than Denver International Airport. Travelers arriving at the higher-elevation airport should be aware of potential altitude effects.

The return flight from Na Thon (Ko Samui Island) (USM) to Denver (DEN) follows a heading of 23° (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 Denver International Airport (DEN) and Samui Airport (USM) detail pages, or use our flight duration calculator to compare other routes.