The flight distance from Ronald Reagan Washington Ntl Airport (DCA) in Washington, United States to Sihanoukville International Airport (KOS) in Sihanukville, Cambodia is 14,518 kilometers (9,021 miles / 7,839 nautical miles). The estimated flight time for this route is approximately 18h, flying north at a heading of 359°.

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 Cambodia. 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 21:19 in Washington, it's 09:19 in Sihanukville. 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.

The return flight from Sihanukville (KOS) to Washington (DCA) follows a heading of 1° (north). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Ronald Reagan Washington Ntl Airport (DCA) and Sihanoukville International Airport (KOS) detail pages, or use our flight duration calculator to compare other routes.