Distance From Sihanoukville International Airport to Ronald Reagan Washington National Airport, KOS - DCA Distance

The distance from Sihanoukville International Airport (KOS) to Ronald Reagan Washington National Airport (DCA) is 9022 miles or 14519 kilometers or 7835 nautical miles.

The distance shown below is direct flight distance between airports. Straight-line distance does not account for the surface between the two points. It is the distance a bird or airplane would travel between the two points when flying above the surface. The straight line distance is the direct route between two points, regardless of whether or not there are roads that connect them.

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How long does it take to travel from Preah Sihanouk ( Cambodia ) to Washington ( United States )?

A one-way nonstop (direct) flight between Preah Sihanouk and Washington takes around 20 hours 44 minutes.

Estimated flight time from Sihanoukville International Airport, Preah Sihanouk, Cambodia to Ronald Reagan Washington National Airport, Washington, United States is 20 hours 44 minutes under avarage conditions. Your actual flying time may vary depending on wind direction/speed or weather conditions. This calculation does not include the departure and landing times of the aircraft. In addition, it does not cover the person identity check, ticket check-in and baggage collection times at the airport.

Travel Distance Between the Airports • KOS - DCA

Kilometers		14519 km
Statute Miles		9022 miles
Nautical Miles		7835 nm
Avg. Time of Flight		20 hours 44 minutes

Sihanoukville International Airport to Ronald Reagan Washington National Airport Flight Route Map - KOS to DCA Flight Path

Location of Sihanoukville International Airport & Ronald Reagan Washington National Airport is given below.
Click the map to view Preah Sihanouk to Washington nonstop flight path and travel direction.

Click to see flight route on Google Map between Preah Sihanouk, Cambodia and Washington, United States. .

Nonstop flight route between Preah Sihanouk, Cambodia and Washington, United States.

Time Difference Between the Airports • KOS - DCA

Time difference between Preah Sihanouk (Cambodia) and Washington (United States) is 12 Hours.
Washington time is 12 Hours behind Preah Sihanouk.

Location	Local Time
Preah Sihanouk (Cambodia)	2025-12-15, 14:11:05 +07
Washington (United States)	2025-12-15, 02:11:05 EST

Why should you arrive 3 hours before international flight? Flyers who are traveling to an international destination should arrive at the airport earlier than domestic flyers. This is because international flights can have additional check-in requirements, like passport verification, that need to be completed before you receive your boarding pass.

Origin

Sihanoukville International Airport (KOS / VDSV) Preah Sihanouk, Cambodia

Destination

Ronald Reagan Washington National Airport (DCA / KDCA) Washington, United States