The flight distance from St Louis Lambert International Airport (STL) in St Louis, United States to Phu Cat Airport (UIH) in Quy Nohn, Vietnam is 13,816 kilometers (8,585 miles / 7,460 nautical miles). The estimated flight time for this route is approximately 17h, 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 Vietnam. 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 06:51 in St Louis, it's 19:51 in Quy Nohn. 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 Quy Nohn (UIH) to St Louis (STL) follows a heading of 18° (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 St Louis Lambert International Airport (STL) and Phu Cat Airport (UIH) detail pages, or use our flight duration calculator to compare other routes.