The flight distance from St Mary's Airport (KSM) in St Mary'S, United States to King Khaled International Airport (RUH) in Riyadh, Saudi Arabia is 9,976 kilometers (6,199 miles / 5,387 nautical miles). The estimated flight time for this route is approximately 13h, flying north northwest at a heading of 333°.

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 04:54 in St Mary'S, it's 16:54 in Riyadh. With a 12-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 1,735 feet between the two airports. King Khaled International Airport sits higher than St Mary's Airport.

The return flight from Riyadh (RUH) to St Mary'S (KSM) follows a heading of 14° (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 Mary's Airport (KSM) and King Khaled International Airport (RUH) detail pages, or use our flight duration calculator to compare other routes.