The flight distance from St Louis Lambert International Airport (STL) in St Louis, United States to Ust-Kut Airport (UKX) in Ust-Kut, Russia is 9,277 kilometers (5,764 miles / 5,009 nautical miles). The estimated flight time for this route is approximately 12h, flying north at a heading of 351°.

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

Time zone information: When it's 20:44 in St Louis, it's 10:44 in Ust-Kut. With a 14-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 1,571 feet between the two airports. Ust-Kut Airport sits higher than St Louis Lambert International Airport.

The return flight from Ust-Kut (UKX) to St Louis (STL) follows a heading of 13° (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 Ust-Kut Airport (UKX) detail pages, or use our flight duration calculator to compare other routes.