The cheapest times to fly from DCA to REP are

  • January 8th to February 18th (except the week of February 5th)
  • March 12th to April 22nd (except the week of March 19th)
  • August 20th to December 9th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from DCA to REP is late October. Prices can be as high as $2406 for Friday flights during mid December, or as low as $958 for Tuesday flights around late October.


When to Fly to Krong Siem Reap

Flying from Washington, DC (DCA) to Siem Reap (REP) will usually cost between $1044 to $1834 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late October with an average ticket price of $1067. Due to high demand the most expensive time to fly is mid December, with an average price of $1964. Planning your trip to low-cost times can easily save you $897 on economy flights and even more on first-class flights. Generally, any price below $1264 can be considered a good price for a round-trip DCA to REP flight.

See below for a graph of average weekly prices for the DCA to REP route. All prices are for round-trip tickets in USD.

DCA to REP Flight Prices

Compared to other flights, the DCA to REP flight is slightly more expensive than the average and costs slightly more than the average flight leaving from Washington. The average price per mile (for a direct flight) is $0.09, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Fridays are the most expensive days to fly to Krong Siem Reap, and Saturdays are the most expensive days to return to Washington. Selecting flights on the least expensive days could save you up to $235 (13%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $1309. Return trip prices are from the REP to DCA flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from DCA to REP can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 16 hour 52 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from DCA to REP while comparing.

Destination alternative #1: Phnom Penh International Airport (PNH) in Phnom Penh

  • 146 miles (235 km) away from REP
  • Usually 13.05% less expensive than REP
  • 2-layover flights available

See DCA to PNH flights


Flight Hacking DCA to REP

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from DCA to REP — but Champion Traveler does!

Hack #1: Phuket (DCA > HKT > REP)

  • Price for both tickets: $1046
  • Average savings: $218 (17.25%)

See DCA to HKT flights

Hack #2: New York, NY (DCA > JFK > REP)

  • Price for both tickets: $1051
  • Average savings: $214 (16.89%)

See DCA to JFK flights

Hack #3: Shanghai (DCA > PVG > REP)

  • Price for both tickets: $1052
  • Average savings: $212 (16.77%)

See DCA to PVG flights


Flight Questions Answered

Still have questions about flying from DCA to REP? We’ve got answers.

Which airlines fly this route?

You can find 19 major airlines flying this route most often: Air Canada, Alaska, American, ANA, Asiana, Austrian, Bangkok Airways, Cathay Dragon, Cathay Pacific, China Airlines, China Eastern, China Southern, Delta, EVA Air, JetBlue, Qatar Airways, Singapore Airlines, United, Vietnam Airlines, and potentially more during busy seasons.

How far away is it from Siem Reap International Airport to Ronald Reagan Washington National Airport?

The distance between the two airports is roughly 8824 miles or 14201 kilometers.

How long does it take to fly from DCA to REP?

The real-world flight time for a nonstop DCA to REP flight is about 16 hour 52 minutes.

How many flights go between Washington, DC and Siem Reap?

It depends on the day of the week and the date, but a typical day might have around 73 available flights from DCA to REP.


Airport Location Info


Departing Airport

Origination code DCA
Origination airport name Ronald Reagan Washington National Airport
City Washington, DC
Country the United States
Latitude 38.9
Longitude -77

Return Airport

Destination code REP
Destination airport name Siem Reap International Airport
City Siem Reap
Country Cambodia
Latitude 13.4
Longitude 103.8


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.