The flight distance from Suvarnabhumi Airport (BKK) in Bangkok, Thailand to Southwest Washington Regional Airport (KLS) in Kelso, United States is 12,062 kilometers (7,495 miles / 6,513 nautical miles). The estimated flight time for this route is approximately 15h, flying north northeast at a heading of 30°.

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 18:15 in Bangkok, it's 03:15 in Kelso. With a 15-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 Kelso (KLS) to Bangkok (BKK) follows a heading of 315° (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 Suvarnabhumi Airport (BKK) and Southwest Washington Regional Airport (KLS) detail pages, or use our flight duration calculator to compare other routes.