The cheapest times to fly from REP to DCA are

  • March 5th to July 15th (except the week of March 12th)

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 REP to DCA is mid April. Prices can be as high as $3456 for Saturday flights during early January, or as low as $1108 for Tuesday flights around mid April.


When to Fly to Washington

Flying from Siem Reap (REP) to Washington, DC (DCA) will usually cost between $1206 to $2730 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid April with an average ticket price of $1216. Due to high demand the most expensive time to fly is early January, with an average price of $2085. Planning your trip to low-cost times can easily save you $868 on economy flights and even more on first-class flights. Generally, any price below $1398 can be considered a good price for a round-trip REP to DCA flight.

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

REP to DCA Flight Prices

Compared to other flights, the REP to DCA flight is slightly more expensive than the average and costs slightly more than the average flight leaving from Krong Siem Reap. The average price per mile (for a direct flight) is $0.1, 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. Saturdays are the most expensive days to fly to Washington, and Fridays are the most expensive days to return to Krong Siem Reap. 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 $1441. Return trip prices are from the DCA to REP 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 REP to DCA 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 REP to DCA while comparing.

Destination alternative #1: Philadelphia International Airport (PHL) in Philadelphia, PA

  • 119 miles (192 km) away from DCA
  • Usually 0.14% less expensive than DCA
  • 2-layover flights available

See REP to PHL flights


Flight Hacking REP to DCA

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 REP to DCA — but Champion Traveler does!

Hack #1: Hong Kong (REP > HKG > DCA)

  • Price for both tickets: $992
  • Average savings: $407 (29.08%)

See REP to PVG flights

Hack #2: Shanghai (REP > PVG > DCA)

  • Price for both tickets: $1104
  • Average savings: $294 (21.03%)

See REP to HKG flights

Hack #3: New York, NY (REP > JFK > DCA)

  • Price for both tickets: $1142
  • Average savings: $256 (18.31%)

See REP to JFK flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 13 major airlines flying this route most often: Air Canada, Air France, American, Asiana, British Airways, Cathay Pacific, China Eastern, China Southern, Delta, JAL, KLM, United, Xiamen, and potentially more during busy seasons.

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

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

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

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

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

It depends on the day of the week and the date, but a typical day might have around 7 available flights from REP to DCA.


Airport Location Info


Departing Airport

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

Return Airport

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


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.