The flight distance from St Louis Lambert International Airport (STL) in St Louis, United States to Capitan D Daniel Vazquez Airport (ULA) in San Julian, Argentina is 10,040 kilometers (6,239 miles / 5,421 nautical miles). The estimated flight time for this route is approximately 13h, flying south southeast at a heading of 166°.

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 Argentina. 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 05:21 in St Louis, it's 07:21 in San Julian.

The return flight from San Julian (ULA) to St Louis (STL) follows a heading of 343° (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 Capitan D Daniel Vazquez Airport (ULA) detail pages, or use our flight duration calculator to compare other routes.