The flight distance from George Bush Intcntl/Houston Airport (IAH) in Houston, United States to Udon Thani Airport (UTH) in Udon Thani, Thailand is 14,401 kilometers (8,948 miles / 7,776 nautical miles). The estimated flight time for this route is approximately 18h, flying north northwest at a heading of 337°.

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 21:38 in Houston, it's 10:38 in Udon Thani. With a 13-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 Udon Thani (UTH) to Houston (IAH) follows a heading of 20° (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 George Bush Intcntl/Houston Airport (IAH) and Udon Thani Airport (UTH) detail pages, or use our flight duration calculator to compare other routes.