WAS - PNH

$805 Find Cheap Flights from Washington, D.C. to Phnom Penh

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Washington, D.C. to Phnom Penh departing on 1/29. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Phnom Penh

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Phnom Penh, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Phnom Penh, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Washington, D.C. to Phnom Penh (WAS-PNH)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington, D.C. to Phnom Penh that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Washington, D.C. to Phnom Penh

Sat, Oct 25 - Tue, Nov 4
Etihad Airways Logo
10:05 pm - 6:30 amIAD-PNH
21h 25m1 stop
Etihad Airways Logo
7:55 am - 3:50 pmPNH-IAD
43h 55m1 stop
$1,199Etihad Airways
Find Deal
Thu, Jan 1 - Thu, Jan 29
Etihad Airways Logo
9:10 pm - 6:25 pmIAD-PNH
33h 15m1 stop
Etihad Airways Logo
7:50 pm - 3:50 pmPNH-IAD
32h 00m1 stop
$1,250Etihad Airways
Find Deal
Tue, Nov 11 - Tue, Nov 18
Etihad Airways Logo
9:10 pm - 6:25 pmIAD-PNH
33h 15m1 stop
Etihad Airways Logo
7:50 pm - 3:50 pmPNH-IAD
32h 00m1 stop
$1,295Etihad Airways
Find Deal
Sat, Jan 3 - Thu, Jan 22
Etihad Airways Logo
9:10 pm - 6:30 amIAD-PNH
21h 20m1 stop
Etihad Airways Logo
7:50 pm - 3:50 pmPNH-IAD
32h 00m1 stop
$1,400Etihad Airways
Find Deal
Tue, Nov 11 - Tue, Nov 18
Multiple Airlines Logo
8:30 pm - 6:25 pmIAD-PNH
33h 55m3 stops
Multiple Airlines Logo
7:50 pm - 7:30 pmPNH-IAD
35h 40m3 stops
$1,784Multiple Airlines
Find Deal
Tue, Nov 11 - Tue, Nov 18
Multiple Airlines Logo
9:10 pm - 6:25 pmIAD-PNH
33h 15m1 stop
Multiple Airlines Logo
7:50 pm - 7:30 pmPNH-IAD
35h 40m3 stops
$1,814Multiple Airlines
Find Deal
Thu, Dec 25 - Thu, Jan 22
Etihad Airways Logo
9:10 pm - 6:25 pmIAD-PNH
33h 15m1 stop
Etihad Airways Logo
7:50 pm - 3:50 pmPNH-IAD
32h 00m1 stop
$1,837Etihad Airways
Find Deal
Thu, Dec 25 - Fri, Jan 23
Etihad Airways Logo
9:10 pm - 6:25 pmIAD-PNH
33h 15m1 stop
Etihad Airways Logo
7:55 am - 3:50 pmPNH-IAD
43h 55m1 stop
$1,869Etihad Airways
Find Deal
Thu, Dec 25 - Fri, Jan 9
Etihad Airways Logo
9:10 pm - 6:25 pmIAD-PNH
33h 15m1 stop
Etihad Airways Logo
7:55 am - 3:50 pmPNH-IAD
43h 55m1 stop
$1,999Etihad Airways
Find Deal
Tue, Nov 11 - Tue, Nov 18
Multiple Airlines Logo
7:50 pm - 6:25 pmIAD-PNH
34h 35m2 stops
Multiple Airlines Logo
7:50 pm - 3:50 pmPNH-IAD
32h 00m1 stop
$2,005Multiple Airlines
Find Deal

Everything you should know

When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 22% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
August
Cheapest • 20% price drop
February
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$1,199
Typical prices: $1,357-1629
Etihad Airways
Sat 10/25Tue 11/4
IAD - PNH • 1 stop
Cheapest one-way
$805
Typical prices: $729-984
Etihad Airways
Thu 1/29
IAD - PNH • 1 stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Phnom Penh!
Booking Insights

KAYAK's insights & trends for Washington, D.C. to Phnom Penh flights

Get data-powered insights and trends into flights from Washington, D.C. to Phnom Penh to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Washington, D.C. to Phnom Penh?

The average price of all round-trip flights from Washington, D.C. to Phnom Penh clicked on KAYAK for each day over the last 12 months.

When flying from Washington, D.C. to Phnom Penh, you should consider leaving on a Friday and avoid Wednesdays if you are looking for the best rates. For your return to Washington, D.C., you’ll find the best rates on Tuesdays and the most expensive ones on Sundays.

What is the cheapest month to fly from Washington, D.C. to Phnom Penh?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. to Phnom Penh, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. to Phnom Penh is August, where tickets cost $1,265 (return) on average. On the other hand, the most expensive months are December and May, where the average cost of round-trip tickets is $1,990 and $1,817 respectively.

How far in advance should I book a flight from Washington, D.C. to Phnom Penh?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Washington, D.C. to Phnom Penh, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Washington, D.C. to Phnom Penh, you should book around 2 weeks before departure, which saves you about 22% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 2 weeks before departure.

Good to know

Low seasonMay
Cheapest flight$805
Best time to beat the crowds but there is an average 15% increase in price.
Most popular time to fly with an average 10% increase in price.
Flight from Washington Dulles Airport to Phnom Penh

When to book flights from Washington, D.C. to Phnom Penh

Are your dates flexible? Find out the best times to travel from Washington, D.C. to Phnom Penh based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Washington, D.C. to Phnom Penh

  • What is the cheapest flight from Washington, D.C. to Phnom Penh?

    In the last 3 days, the lowest price for a flight from Washington, D.C. to Phnom Penh was $805 for a one-way ticket and $1,199 for a round-trip.

  • Do I need a passport to fly between Washington, D.C. and Phnom Penh?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Washington, D.C. and on arrival in Phnom Penh.

  • Which airports will I be using when flying from Washington, D.C. to Phnom Penh?

    Washington, D.C. is served by 2 major airports and there is only 1 main airport in Phnom Penh. You will leave Washington, D.C. from one of these airports: Washington, D.C. Reagan-National or Washington, D.C. Dulles Intl. You will be arriving at Phnom Penh Pochentong.

  • Which aircraft models fly most regularly from Washington, D.C. to Phnom Penh?

    We unfortunately don’t have that data for this specific route.

  • What is the most popular layover when flying to Phnom Penh from Washington, D.C.?

    Seoul is the most popular layover city among KAYAK users traveling from Washington, D.C. to Phnom Penh.

  • Which is the best airline for flights from Washington, D.C. to Phnom Penh, Korean Air or Singapore Airlines?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Phnom Penh are Korean Air and Singapore Airlines. With an average price for the route of $1,651 and an overall rating of 8.4, Korean Air is the most popular choice. Singapore Airlines is also a great choice for the route, with an average price of $1,441 and an overall rating of 8.1.

  • How does KAYAK find such low prices on flights from Washington, D.C. to Phnom Penh?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington, D.C. to Phnom Penh.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington, D.C. to Phnom Penh?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Phnom Penh from Washington, D.C. is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington, D.C. to Phnom Penh?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Phnom Penh with an airline and back to Washington, D.C. with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington, D.C. to Phnom Penh?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Phnom Penh from Washington, D.C. up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Washington, D.C. to Phnom Penh

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Phnom Penh. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Washington, D.C. to Phnom Penh? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.4
Korean AirOverall score based on 1140 reviews
8.3Comfort
8.2Entertainment
8.7Crew
8.5Boarding
8.1Food
Airline reviews

They were trying to get people to check luggage because the over head compartments were full but when we boarded there were lots of empty places that people could have put the luggage.

8.0 ExcellentMatt, Aug 2025ATL - EWR
Read more Korean Air reviews

They were trying to get people to check luggage because the over head compartments were full but when we boarded there were lots of empty places that people could have put the luggage.

It was good, I liked the self-serve snacks but it was a little difficult to get the alcohol, which is understandable since I wouldn't want kids sneaking it.

Friendly flight attendants and gate agents. Very clean plane and food was good!

I was unable to select decent seats, and so I was stuck in the middle seat because it was selected for me

There was a lot of partial tv shows but not enough to last the flight. The food was incredible! The crew were so helpful and patient. Lots more space than what I usually get on an international flight. Very comfortable!

Stingy on the drinks - 15 hour direct flight and could barely get attention for some water

Not many people, so you can lay down on two seats

It's good overall. Flight was packed. Inflight entertainment choices were lacking.

The delay in Korea was a pain and set us back a day. I have to give big props to Korean Air for setting up a hotel with dinner and transportation to and from the hotel. I also needed assistance with a wheelchair and they did an outstanding job.

Great except for the delay in Korea. Korean Air did a great job setting up a hotel for the night. I also needed assistance with a wheelchair and they were outstanding.

The staff on the plane were attentive and friendly. The frustration with the cabin crew was that we were served second to special diet people. And, we were in economy section. The boarding staff was mediocre. Got scolded for requesting to sit with spouse on 14 hours long flight home. Was told they cannot break up families for us. Didn’t understand how we were denied sitting together as we are husband and wife. After many words of exchange, we were accommodated. Cleaning crew did a horrible job! Bathrooms were unsanitary or dirty from beginning of flight! Didn’t expect sparkling as its economy, but did except decent.

Crew and service excellent. 2 hour delay for takeoff. SQ app showed flight on time.

Very good flight from Boarding to landing -efficient and comfortable with decent entertainment options

Excelent service and plenty of food and drinks during the flight. Flight crew very attentive to our needs. Leg room between rows are very disappointing.

Construction at PDX resulting in very lung walk from the rental car to the gate. SFO, extremely long walk between terminals to get to connecting Singapore airlines flight. My smart watch recorded a total of 3 miles.

The seat in economy class and legroom in Singapore airline are narrower than Korean airlines! I don’t have that comforting feeling flying with Singapore air as in the past!

Loved the airline with the exception of their carry on limitations. They enforce a strict 7 kilo limit for carry on baggage which is ridiculous. We traveled from SFO to SIN with carry on with no difficulty yet when we checked in Delhi they forced us to check the carry on bags. The weight of our carry on bags were 11 and 12 kilos and while they exceeded the limitations set by Singapore Airlines they were well under weight limitations set by may other carriers. Interestingly my wife and I were each allowed two 22 KG bags to check in addition to the 7 kg carry on for a total weight of 102 KG's. Our total weight with the one bag we planned to check and our two carry ons was 46 kgs.

Crew and service was excellent, but passengers should be offered a welcome drink before take off which did not happen. Food was very good. Unfortunately the lie-flat bed in business class was one of the most uncomfortable I have experienced. The configuration forces you to sleep with your legs at an angle instead of in a straight line, plus there is very little padding on the bed so it wasn't possible to sleep for more than 2-3 hours on an 18 hour flight. For what the airlines charges for a business class ticket their hard product leaves a lot to be desired.

Food could have been better. Too many passengers getting up and down all the time.

Everything was great keep up the good work 😁, can't ask for more.

Everything you need to know for your flight from Washington, D.C. to Phnom Penh

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.