The flight distance from St Louis Lambert International Airport (STL) in St Louis, United States to Guardiamarina Zanartu Airport (WPU) in Puerto Williams, Chile is 10,639 kilometers (6,611 miles / 5,745 nautical miles). The estimated flight time for this route is approximately 14h, flying south southeast at a heading of 167°.

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 Chile. It is an intercontinental flight between North America and South America. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 23:35 in St Louis, it's 00:35 in Puerto Williams.

The return flight from Puerto Williams (WPU) to St Louis (STL) follows a heading of 342° (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 St Louis Lambert International Airport (STL) and Guardiamarina Zanartu Airport (WPU) detail pages, or use our flight duration calculator to compare other routes.