The flight distance from Boeing Field/King County International Airport (BFI) in Seattle, United States to Suvarnabhumi Airport (BKK) in Bangkok, Thailand is 11,982 kilometers (7,445 miles / 6,470 nautical miles). The estimated flight time for this route is approximately 15h, flying northwest at a heading of 316°.

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 16:43 in Seattle, it's 07:43 in Bangkok. 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 Bangkok (BKK) to Seattle (BFI) follows a heading of 29° (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 Boeing Field/King County International Airport (BFI) and Suvarnabhumi Airport (BKK) detail pages, or use our flight duration calculator to compare other routes.