The flight distance from RAF Ascension Island (ASI) in Ascension Island, SH to St Louis Lambert International Airport (STL) in St Louis, United States is 9,367 kilometers (5,821 miles / 5,058 nautical miles). The estimated flight time for this route is approximately 12h, flying northwest at a heading of 310°.

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 SH with United States. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 01:54 in Ascension Island, it's 19:54 in St Louis. With a 6-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

The return flight from St Louis (STL) to Ascension Island (ASI) follows a heading of 105° (east 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 RAF Ascension Island (ASI) and St Louis Lambert International Airport (STL) detail pages, or use our flight duration calculator to compare other routes.