PHL - IAD

$91 Find Cheap Flights from Philadelphia 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 Philadelphia to Dulles Intl departing on 11/3. 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 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 Philadelphia 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 Philadelphia to Washington, D.C., as well as popular online travel agencies
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Flight Deals

Cheap Flights from Philadelphia to Dulles Intl (PHL-IAD)

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

Tue, Oct 14 - Tue, Oct 21
Frontier Logo
10:22 am - 7:46 pmPHL-IAD
9h 24m1 stop
Frontier Logo
9:00 am - 6:44 pmIAD-PHL
9h 44m1 stop
$153Frontier
Find Deal
Thu, Oct 30 - Thu, Nov 6
Frontier Logo
1:02 pm - 11:29 pmPHL-IAD
10h 27m1 stop
Frontier Logo
3:51 pm - 1:29 amIAD-PHL
9h 38m1 stop
$161Frontier
Find Deal
Fri, Oct 24 - Sun, Oct 26
United Airlines Logo
7:58 pm - 9:05 pmPHL-IAD
1h 07mnonstop
United Airlines Logo
8:30 am - 9:46 amIAD-PHL
1h 16mnonstop
$179United Airlines
Find Deal
Sun, Sep 28 - Thu, Oct 2
Frontier Logo
5:01 am - 9:19 pmPHL-IAD
16h 18m1 stop
Frontier Logo
8:59 pm - 2:38 pmIAD-PHL
17h 39m1 stop
$184Frontier
Find Deal
Fri, Oct 24 - Sun, Oct 26
Frontier Logo
11:50 am - 8:08 pmPHL-IAD
8h 18m1 stop
Frontier Logo
8:02 pm - 7:30 amIAD-PHL
11h 28m1 stop
$187Frontier
Find Deal
Tue, Sep 30 - Sat, Oct 4
United Airlines Logo
10:32 am - 11:45 amPHL-IAD
1h 13mnonstop
United Airlines Logo
12:50 pm - 2:04 pmIAD-PHL
1h 14mnonstop
$189United Airlines
Find Deal
Sun, Sep 28 - Thu, Oct 2
 Logo
1:16 pm - 11:23 amPHL-IAD
22h 07m2 stops
 Logo
6:10 am - 4:10 pmIAD-PHL
10h 00m1 stop
Sun, Sep 28 - Thu, Oct 2
 Logo
5:20 pm - 2:25 pmPHL-IAD
21h 05m1 stop
 Logo
6:10 am - 4:10 pmIAD-PHL
10h 00m1 stop
Tue, Sep 30 - Sat, Oct 4
American Airlines Logo
11:40 am - 6:51 pmPHL-IAD
7h 11m1 stop
American Airlines Logo
2:21 pm - 7:40 pmIAD-PHL
5h 19m1 stop
$289American Airlines
Find Deal
Tue, Nov 11 - Mon, Dec 1
American Airlines Logo
8:40 am - 1:35 pmPHL-IAD
4h 55m1 stop
American Airlines Logo
8:09 pm - 12:10 amIAD-PHL
4h 01m1 stop
$329American Airlines
Find Deal

Everything you should know

Our travelers' advice
AI-generated summary based on content written by travel experts
United's Economy Plus offers extra legroom on flights.
The Silver Line Metro connects IAD to downtown D.C.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Frontier
Cheapest • from $153 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$153
Frontier
Tue 10/14Tue 10/21
PHL - IAD • 1 stop
Cheapest non-stop
$179
United Airlines
Fri 10/24Sun 10/26
PHL - IAD • Non-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 Dulles Intl!
Expert advice

Expert advice for your flight from Philadelphia 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
ANA

ANA's domestic flights offer efficient service and punctuality, typical of Japanese standards.


ANA provides slippers even in premium economy, enhancing comfort during flights.

Read more about ANAby Gabriel Leigh
United Airlines

United offers Priority Boarding to avoid gate-checking your carry-on bag.


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

Airports
PHL

PHL's SEPTA Airport Line offers a convenient 30-minute ride to downtown Philadelphia, making it an affordable option for reaching the airport.

Read more about PHLby Harriet Baskas
IAD

The Silver Line Metro connects IAD to downtown D.C. in about 50 minutes, offering a convenient public transportation option.

Read more about IADby Stefanie Waldek
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on ANA

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
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
Harriet Baskas

Harriet Baskas

Expert on PHL

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Booking Insights

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

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

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

For Philadelphia to Washington Dulles Airport, Wednesday is the cheapest day to fly on average and Saturday is the most expensive. Flying from Washington Dulles Airport back to Philadelphia, the best deals are generally found on Friday, with Saturday being the most expensive.

Good to know

Low seasonJune
Cheapest flight$91
Best time to beat the crowds with an average 33% drop in price.
Most popular time to fly and prices are also 3% lower on average.
Flight from Philadelphia to Washington Dulles Airport

When to book flights from Philadelphia to Dulles Intl

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

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

    In the last 3 days, the lowest price for a flight from Philadelphia to Washington, D.C. Dulles Intl Airport was $91 for a one-way ticket and $153 for a round-trip.

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

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

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

    All the following airlines offer inflight Wi-Fi service on the Philadelphia to Washington Dulles Airport flight route: American Airlines, Iberia, Finnair, Aer Lingus, Japan Airlines, British Airways, Delta, Alaska Airlines, and SWISS.

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

    The Boeing 787-9 Dreamliner is the aircraft model that flies most regularly on the Philadelphia to Washington Dulles Airport flight route.

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

    Star Alliance is the only airline alliance operating flights between Philadelphia and Washington Dulles Airport.

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

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

  • How does KAYAK find such low prices on flights from Philadelphia 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 Philadelphia to Washington Dulles Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Philadelphia 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 Philadelphia 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 Philadelphia 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 Philadelphia with another airline. Booking your flights between Philadelphia 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 Philadelphia 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 Philadelphia 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 Philadelphia to Washington, D.C. Dulles Intl Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $322 or less one-way and $554 or less round-trip.

Prefer to fly direct from Philadelphia 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 Philadelphia to Washington, D.C. Dulles Intl.
Find which airlines fly direct from Philadelphia Airport to Washington, D.C. Dulles Intl Airport, which days they fly and book direct flights.

Direct departures

Philadelphia to Washington, D.C. Dulles Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Direct returns

Washington, D.C. Dulles Intl to Philadelphia

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Reviews of the top airline flying from Philadelphia to Dulles Intl

 
See real verified KAYAK customer reviews for airlines flying from Philadelphia 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 Philadelphia 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.
7.4
United AirlinesOverall score based on 8929 reviews
7.3Comfort
6.6Food
7.7Boarding
8.1Crew
7.1Entertainment
Airline reviews

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

10.0 ExcellentThomas, Aug 2025CMH - IAD
Read more United Airlines reviews

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

United airlines, mediocre at best. No issues , nothing great . Worked for me

Turbulent taking off & landing to Dulles from Raleigh. Flight from Dulles to Tokyo very good!!

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

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