The flight distance from London Heathrow Airport (LHR) in London, United Kingdom to Samui Airport (USM) in Na Thon (Ko Samui Island), Thailand is 9,895 kilometers (6,149 miles / 5,343 nautical miles). The estimated flight time for this route is approximately 13h, flying east northeast at a heading of 76°.

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 Kingdom with Thailand. It is an intercontinental flight between Europe and Asia. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 01:34 in London, it's 08:34 in Na Thon (Ko Samui Island). With a 7-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

The return flight from Na Thon (Ko Samui Island) (USM) to London (LHR) follows a heading of 322° (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 London Heathrow Airport (LHR) and Samui Airport (USM) detail pages, or use our flight duration calculator to compare other routes.