The flight distance from St Louis Lambert International Airport (STL) in St Louis, United States to Riyadh Air Base (XXN) in Riyadh, Saudi Arabia is 11,666 kilometers (7,249 miles / 6,299 nautical miles). The estimated flight time for this route is approximately 15h, flying northeast at a heading of 40°.

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 Saudi Arabia. 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 14:52 in St Louis, it's 23:52 in Riyadh. With a 9-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

There is a significant elevation difference of 1,465 feet between the two airports. Riyadh Air Base sits higher than St Louis Lambert International Airport.

The return flight from Riyadh (XXN) to St Louis (STL) follows a heading of 327° (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 Riyadh Air Base (XXN) detail pages, or use our flight duration calculator to compare other routes.