The flight distance from Kamphaeng Saen Airport (KDT) in Nakhon Pathom, Thailand to St Louis Lambert International Airport (STL) in St Louis, United States is 14,042 kilometers (8,725 miles / 7,582 nautical miles). The estimated flight time for this route is approximately 18h, flying north at a heading of 10°.

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 Thailand 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 02:01 in Nakhon Pathom, it's 14:01 in St Louis. With a 12-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 St Louis (STL) to Nakhon Pathom (KDT) follows a heading of 348° (north 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 Kamphaeng Saen Airport (KDT) and St Louis Lambert International Airport (STL) detail pages, or use our flight duration calculator to compare other routes.