The flight distance from Rio Mayo Airport (ROY) in Rio Mayo, Argentina to St Louis Lambert International Airport (STL) in St Louis, United States is 9,603 kilometers (5,967 miles / 5,185 nautical miles). The estimated flight time for this route is approximately 12h, flying north northwest at a heading of 344°.

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

Time zone information: When it's 17:05 in Rio Mayo, it's 14:05 in St Louis. The 3-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

There is a significant elevation difference of 1,167 feet between the two airports. St Louis Lambert International Airport sits lower than Rio Mayo Airport.

The return flight from St Louis (STL) to Rio Mayo (ROY) follows a heading of 166° (south southeast). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Rio Mayo Airport (ROY) and St Louis Lambert International Airport (STL) detail pages, or use our flight duration calculator to compare other routes.