iad-to-kos

 

The cheapest times to fly from IAD to KOS are

  • October 22nd to April 29th (except the weeks of March 26th and April 2nd)

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 IAD to KOS is mid January. Prices can be as high as $12500 for Friday flights during early to mid October, or as low as $1489 for Thursday flights around mid January.

 

When to Fly to Sihanoukville

Flying from Washington, DC (IAD) to Kompongsom (KOS) will usually cost between $4012 to $8157 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid January with an average ticket price of $5070. Due to high demand the most expensive time to fly is early to mid October, with an average price of $8409. Planning your trip to low-cost times can easily save you $3339 on economy flights and even more on first-class flights. Generally, any price below $5915 can be considered a good price for a round-trip IAD to KOS flight.

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

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IAD to KOS Flight Prices

Compared to other flights, the IAD to KOS flight is more expensive than the average and costs more than the average flight leaving from Washington. The average price per mile (for a direct flight) is $0.41, which is a bit above average.

 

Flight Prices by Day of the Week

Thursday is usually the cheapest day to fly to KOS, and Sunday the cheapest day to fly back into IAD. Fridays are the most expensive days to fly to Sihanoukville, and Saturdays are the most expensive days to return to Washington. Selecting flights on the least expensive days could save you up to $1527 (21%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Thursday and returning a week later will cost an average of $5025. Return trip prices are from the KOS to IAD flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

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Departure Day Prices

Return Trip Prices by Day

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Return Day Prices

 

Nonstop Flights and Layovers

Travelers looking to fly from IAD to KOS can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 17 hour 12 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 IAD to KOS while comparing.

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

  • 102 miles (164 km) away from KOS
  • Usually 81.75% less expensive than KOS
  • 1-layover flights available

See IAD to PNH flights

Destination alternative #2: Phu Quoc International Airport (PQC) in Phu Quoc

  • 36 miles (58 km) away from KOS
  • Usually 58.00% less expensive than KOS
  • 2-layover flights available

See IAD to PQC flights

Destination alternative #3: Trat Airport (TDX) in Trat

  • 148 miles (238 km) away from KOS
  • Usually 34.26% less expensive than KOS
  • 2-layover flights available

See IAD to TDX flights

Destination alternative #4: Can Tho International Airport (VCA) in Can Tho

  • 142 miles (229 km) away from KOS
  • Usually 15.88% less expensive than KOS
  • 2-layover flights available

See IAD to VCA flights

 

Flight Hacking IAD to KOS

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 IAD to KOS — but Champion Traveler does!

Hack #1: Ho Chi Minh City (IAD > SGN > KOS)

  • Price for both tickets: $1107
  • Average savings: $4808 (81.28%)

See IAD to SGN flights

Hack #2: Kuala Lumpur (IAD > KUL > KOS)

  • Price for both tickets: $1116
  • Average savings: $4799 (81.13%)

See IAD to KUL flights

Hack #3: San Francisco, CA (IAD > SFO > KOS)

  • Price for both tickets: $1395
  • Average savings: $4520 (76.41%)

See IAD to SFO flights

 

Flight Questions Answered

Still have questions about flying from IAD to KOS? We’ve got answers.

Which airlines fly this route?

You can find 17 major airlines flying this route most often: Air France, Alaska, ANA, British Airways, Brussels Airlines, China Southern, Delta, Emirates, Hainan, JAL, KLM, Shenzhen, Sichuan Airlines, Singapore Airlines, United, Vietnam Airlines, Xiamen, and potentially more during busy seasons.

How far away is it from Kompongsom Airport to Washington Dulles International Airport?

The distance between the two airports is roughly 9011 miles or 14502 kilometers.

How long does it take to fly from IAD to KOS?

The real-world flight time for a nonstop IAD to KOS flight is about 17 hour 12 minutes.

How many flights go between Washington, DC and Kompongsom?

It depends on the day of the week and the date, but a typical day might have around 12 available flights from IAD to KOS.

 

Airport Location Info

 

Departing Airport

Origination codeIAD
Origination airport nameWashington Dulles International Airport
CityWashington, DC
Countrythe United States
Latitude38.9
Longitude-77.5

Return Airport

Destination codeKOS
Destination airport nameKompongsom Airport
CityKompongsom
CountryCambodia
Latitude10.6
Longitude103.7

 

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.