The flight distance from Adelaide International Airport (ADL) in Adelaide, Australia to St Mary's County Regional Airport (LTW) in Leonardtown, United States is 16,881 kilometers (10,490 miles / 9,115 nautical miles). The estimated flight time for this route is approximately 21h, flying east northeast at a heading of 73°.

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

Time zone information: When it's 23:29 in Adelaide, it's 07:59 in Leonardtown. With a 15.5-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 Leonardtown (LTW) to Adelaide (ADL) follows a heading of 266° (west). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Adelaide International Airport (ADL) and St Mary's County Regional Airport (LTW) detail pages, or use our flight duration calculator to compare other routes.