PHX - IAD

$129 Find Cheap Flights from Phoenix to Washington Dulles Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Phoenix to Dulles Intl departing on 1/30. 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, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C. Dulles Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Phoenix to Washington, D.C., 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 Phoenix to Washington, D.C., as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$241
Overall average: $431
Frontier
Fri 12/12Sun 12/14
PHX - IAD • 2 stops
Cheapest non-stop
$329
Typical prices: $351-$524
United Airlines
Mon 11/24Tue 12/2
PHX - IAD • Non-stop
Our travelers' advice
AI-generated summary based on content written by travel experts
Southwest's two free checked bags suit luggage needs.
The Silver Line Metro links IAD to downtown in 50 mins.
Expert advice
Expert advice
Expert advice
Expert advice
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 44% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
August
Cheapest • 23% price drop
December
Most popular
Good to know
Good to know
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+1
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Good to know
+1
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We hope you love your trip to Dulles Intl!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Phoenix to Dulles Intl (PHX-IAD)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Phoenix to Dulles Intl 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 Phoenix to Dulles Intl

Fri, Dec 12 - Sun, Dec 14
Frontier Logo
6:00 am - 8:24 pmPHX-IAD
36h 24m2 stops
Frontier Logo
5:45 am - 3:18 pmIAD-PHX
11h 33m1 stop
$241Frontier
Find Deal
Mon, Nov 17 - Thu, Dec 4
Frontier Logo
10:00 pm - 8:20 pmPHX-IAD
20h 20m2 stops
Frontier Logo
7:18 pm - 3:18 pmIAD-PHX
22h 00m1 stop
$243Frontier
Find Deal
Thu, Nov 20 - Fri, Nov 28
Frontier Logo
6:00 am - 5:46 pmPHX-IAD
9h 46m1 stop
Frontier Logo
6:55 am - 1:18 pmIAD-PHX
8h 23m1 stop
$246Frontier
Find Deal
Tue, Jan 13 - Sun, Jan 18
Multiple Airlines Logo
11:18 am - 4:48 pmPHX-IAD
27h 30m1 stop
Multiple Airlines Logo
10:49 am - 5:24 pmIAD-PHX
8h 35m1 stop
$247Multiple Airlines
Find Deal
Wed, Dec 10 - Sun, Dec 14
Multiple Airlines Logo
7:43 pm - 8:26 amPHX-IAD
10h 43m2 stops
Multiple Airlines Logo
5:45 am - 3:18 pmIAD-PHX
11h 33m1 stop
$248Multiple Airlines
Find Deal
Thu, Dec 4 - Wed, Dec 10
Multiple Airlines Logo
10:26 pm - 11:05 pmPHX-IAD
22h 39m2 stops
Multiple Airlines Logo
10:00 am - 9:49 amIAD-PHX
25h 49m1 stop
$249Multiple Airlines
Find Deal
Fri, Dec 12 - Tue, Dec 23
Frontier Logo
6:00 am - 4:24 pmPHX-IAD
8h 24m1 stop
Frontier Logo
6:34 am - 8:48 amIAD-PHX
28h 14m2 stops
$251Frontier
Find Deal
Sat, Nov 15 - Mon, Nov 17
Frontier Logo
2:23 pm - 11:55 pmPHX-IAD
7h 32m1 stop
Frontier Logo
8:37 pm - 10:24 pmIAD-PHX
27h 47m2 stops
$254Frontier
Find Deal
Tue, Dec 16 - Tue, Dec 23
Frontier Logo
2:30 pm - 2:29 pmPHX-IAD
21h 59m2 stops
Frontier Logo
9:58 pm - 11:49 pmIAD-PHX
27h 51m1 stop
$257Frontier
Find Deal
Thu, Nov 13 - Sun, Nov 16
Multiple Airlines Logo
5:36 pm - 8:26 pmPHX-IAD
24h 50m1 stop
Multiple Airlines Logo
8:36 pm - 11:02 amIAD-PHX
16h 26m2 stops
$258Multiple Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Phoenix to Dulles Intl flights

Get data-powered insights and trends into flights from Phoenix to Dulles Intl 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 Phoenix to Washington Dulles Airport?

The average price of all round-trip flights from Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Phoenix to Washington Dulles Airport, look for departures on Fridays and avoid leaving on a Monday, as it's usually the priciest day. When flying back from Washington Dulles Airport, Tuesday is the cheapest day to fly and Sunday is the most expensive.

What is the cheapest month to fly from Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport, 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 Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport is August, where tickets cost $299 (return) on average. On the other hand, the most expensive months are January and October, where the average cost of round-trip tickets is $485 and $457 respectively.

Can I save money by flying with a layover from Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $393, prices are generally cheapest when you fly direct.

How far in advance should I book a flight from Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport, 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 Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport, you should book around 4 weeks before departure, which saves you about 44% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 23 weeks before departure.

Expert advice

Expert advice for your flight from Phoenix to Dulles Intl

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
United Airlines

United's Economy Plus offers up to six inches more legroom than standard economy seats.


United's Wi-Fi allows free messaging; T-Mobile customers get free streaming Wi-Fi on flights.

Southwest

Southwest offers free carry-on and personal item, but checked bags now incur fees.


Southwest's Wi-Fi allows streaming; download the app beforehand for entertainment access.

Read more about Southwestby Blane Bachelor
Airports
PHX

PHX offers touchless parking and premium valet services near Terminals 3 and 4, making departure convenient and efficient.

Read more about PHXby Laura Ratliff
IAD

The Silver Line Metro connects IAD to downtown D.C. in about 50 minutes, offering a convenient and cost-effective arrival option.

Read more about IADby Stefanie Waldek
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and IAD

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor

Blane Bachelor

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more
Laura Ratliff

Laura Ratliff

Expert on PHX

Laura Ratliff

Laura Ratliff

Laura Ratliff is a New York-based writer and editor. She lives in downtown Brooklyn with her husband and their beloved dogs. Originally from Texas, she now considers New York City her home. She typically spends more than 200,000 miles on a plane each year and stays in plenty of hotels.

Read more

Good to know

Low seasonFebruary
Cheapest flight$129
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly with an average 10% increase in price.
Flight from Phoenix to Washington Dulles Airport

When to book flights from Phoenix to Dulles Intl

Are your dates flexible? Find out the best times to travel from Phoenix to Dulles Intl 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 Phoenix to Washington Dulles Airport flights

  • What is the cheapest flight from Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport?

    In the last 3 days, the lowest price for a flight from Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport was $129 for a one-way ticket and $241 for a round-trip.

  • Do I need a passport to fly between Phoenix and Washington Dulles Airport?

    A passport is not required to fly from Phoenix to Washington Dulles Airport.

  • Which airlines offer Wi-Fi service onboard planes from Phoenix to Washington Dulles Airport?

    All the following airlines offer inflight Wi-Fi service on the Phoenix to Washington Dulles Airport flight route: American Airlines, JetBlue, Delta, Lufthansa, United Airlines, and Air Canada.

  • Which aircraft models fly most regularly from Phoenix to Washington Dulles Airport?

    The Boeing 737-900 is the aircraft model that flies most regularly on the Phoenix to Washington Dulles Airport flight route.

  • Which airline alliances offer flights from Phoenix to Washington Dulles Airport?

    SkyTeam, and Star Alliance are the airline alliances operating flights between Phoenix and Washington Dulles Airport, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from Phoenix to Washington Dulles Airport?

    There are nonstop flights from Phoenix to Washington Dulles Airport on a daily basis.

  • Which is the best airline for flights from Phoenix to Washington, D.C., Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Phoenix to Washington, D.C. are Southwest and Delta. With an average price for the route of $391 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $337 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Phoenix to Washington Dulles Airport?

    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 Phoenix to Washington Dulles Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Phoenix to Washington Dulles Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from Phoenix 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 Phoenix to Washington Dulles Airport?

    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 Washington Dulles Airport with an airline and back to Phoenix with another airline. Booking your flights between Phoenix and IAD can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Phoenix to Washington Dulles Airport?

    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 Washington Dulles Airport from Phoenix up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $233 or less one-way and $377 or less round-trip.

Prefer to fly direct from Phoenix to Washington Dulles Airport?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Phoenix Sky Harbor Intl to Washington, D.C. Dulles Intl.
Find which airlines fly direct from Phoenix Sky Harbor Intl Airport to Washington, D.C. Dulles Intl Airport, which days they fly and book direct flights.

Direct departures

Phoenix Sky Harbor Intl to Washington, D.C. Dulles Intl

Monday

Southwest, United Airlines

Southwest, United Airlines

Tuesday

Southwest, United Airlines

Southwest, United Airlines

Wednesday

Southwest, United Airlines

Southwest, United Airlines

Thursday

Southwest, United Airlines

Southwest, United Airlines

Friday

Southwest, United Airlines

Southwest, United Airlines

Saturday

Southwest, United Airlines

Southwest, United Airlines

Sunday

Southwest, United Airlines

Southwest, United Airlines

See more direct flights

Direct returns

Washington, D.C. Dulles Intl to Phoenix Sky Harbor Intl

Monday

Southwest, United Airlines

Southwest, United Airlines

Tuesday

Southwest, United Airlines

Southwest, United Airlines

Wednesday

Southwest, United Airlines

Southwest, United Airlines

Thursday

Southwest, United Airlines

Southwest, United Airlines

Friday

Southwest, United Airlines

Southwest, United Airlines

Saturday

Southwest, United Airlines

Southwest, United Airlines

Sunday

Southwest, United Airlines

Southwest, United Airlines

See more direct flights

Reviews of the top 4 airlines serving from Phoenix to Dulles Intl

 
See real verified KAYAK customer reviews for airlines flying from Phoenix to Washington, D.C.. 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 Phoenix to Dulles Intl? 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.
8.0
SouthwestOverall score based on 4243 reviews
8.6Crew
7.0Food
8.1Boarding
8.0Comfort
7.5Entertainment
Airline reviews

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

8.0 ExcellentGreg, Oct 2025OAK - BUR
Read more Southwest reviews

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

All was good. I just had a hard time getting connected to the WiFi/internet during the flight

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Great flight. Outstanding Service. Southwest was able to put us on a direct flight to Denver when the connection could have been affected by a later arrival to Baltimore. The direct flight was less expensive that the flight with the connection in Baltimore.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

Everything went well and was good. Nothing exceptional, but no complaints either. Cheap seats are pretty comfortable.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Flight was crowded and the woman sitting on my left was large & kept crouching in to my space. You need bigger seats or smaller passengers to fit into the seats you DO have! Snack were OK. Would appreciate if airlines had more savory rather than sweet snacks, thank you!

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

Crew was dismissive. Snacks and refills not offered. Poor business class experience. Bed not comfortable compared to Emirates or BA.

Flight was delayed for 5 hours because crew didn’t have enough time to rest - this seems like it could have been avoided with better scheduling. Food was not good.

IAD with the archaic people movers is just a place to be avoided.

Overall, it was good. I was seating next to a wonderful lady and did not notice how time flew. Thanks

This is the best united airlines flight that I took. The crew was very friendly and the food was tasty!

It is clear that someone knew, and competent, is in charge of food at United Airlines at least for the international flights. I was flying in coach, but the choices of the dinner were excellent. Tasty, and appropriate size. I had the beef, which was a little bit like a shepherds pie, and it was good. Nothing comparable has been served on a United flight in years. It will not be confused with three star food, but it is very good for airline food. Even better was the breakfast choice between a cinnamon roll and a breakfast sandwich. I chose the breakfast sandwich which was absolutely delicious and which I would happily order again at my local Starbucks or Panera. It is clear that someone knew indifferent is in charge of the food and it’s about time.

Had one staff that was not pleasant. Seems they are stressed with too many people to care for.

I would have liked an opportunity to move to a different seat ( even would have checked in my hand luggage)as I had health issues where I didn't have to clamber over the passenger next to me to for toilet use/ movement [ She was a highly unpleasant neighbor to sit next to]. In addition, I found that my European phone plan had run out of data and so I was not receiving emails from yourselves on airport wifi to be able to check in online and verifications difficult as did not accept the ticket number I had. I asked for an extra blanket but was told there was none. Then I saw other passengers receiving them. I couldn't eat the food and asked for snacks : Stewardess said " on the way" but they did not bring. The best bit was the check in process in Lisbon. Very efficient. However, I did not understand why we had to collect our bags at Washington then go through customs again. It was not explained. I also with my leg and health issue had approximately mile walk to the gate ( which then changed) . There appeared to be no moving walkways or help provided.

The attendant were friendly. I suggest you have a medical attendant on board every flight so that in case someone is sick , he/she will help them.

We had a very long diversion and our food voucher didn’t work because the restaurants were closed

Terrible. Flight cancelled with no reasoning and no flights to rebook. Employees were useless and did nothing to help. Did not even know where to retrieve luggage from the cancelled flight. Flyers beware.

No fault of Frontier staff: plane was very late, reached Orlando at 1 am, took a while to get luggage. Weather, gov financial shutdown impact on TSA, air controllers seemed to have multiple flights backed up. Frontier staff seemed to cope as gracefully as possible. It did reassure me that I and my new hip could adapt to travel challenges. Food/entertainment were irrelevant to my trip.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

Boarding was on time and plane departed as scheduled. There are obviously no amenities (food, drink, entertainment) on Frontier, but there also didn't seem to be any issues with luggage space either.

Inbound plane was on time and flight departed on time with no issues while boarding.

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

i was unable to check in the flight. refund requested

It was well done. It was my first time flying with them and I was nervous b/c I have heard of many cancelled and/or delray flights. Everything went smoothly.

Just know that everything, and I mean everything is “ala cart”. 60$ just to put something in the overhead bin. I will never fly Frontier again nor do I recommend them to anyone else.

The single worst check in experience I could imagine. I’ll never do any business with Frontier or any affiliated company

Everything you need to know for your flight from Phoenix to Dulles Intl

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