PHL - IAD

$179 Find Cheap Flights from Philadelphia to Washington Dulles Airport

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Dulles Intl departing on 5/27. 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

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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Flights Deals

Cheap Flights from Philadelphia to Dulles Intl

 
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.

Recent round-trip flight deals from Philadelphia to Dulles Intl

KAYAK's recommended round-trip deals from the most popular airlines that fly from Philadelphia to Dulles Intl.
Discover the best prices for you by selecting your travel dates on KAYAK.
United Airlines Logo
10:35 am - 11:40 amPHL-IAD
1h 05mnonstop
United Airlines Logo
5:30 pm - 6:45 pmIAD-PHL
1h 15mnonstop
$179United Airlines
Find Deal
Tue, May 27 - Tue, Jun 3
United Airlines Logo
6:15 am - 7:21 amPHL-IAD
1h 06mnonstop
United Airlines Logo
12:55 pm - 2:05 pmIAD-PHL
1h 10mnonstop
$194United Airlines
Find Deal
Wed, May 14 - Sat, May 17
United Airlines Logo
10:35 am - 11:40 amPHL-IAD
1h 05mnonstop
United Airlines Logo
8:29 am - 9:39 amIAD-PHL
1h 10mnonstop
$239United Airlines
Find Deal
Fri, Jun 13 - Sat, Jun 21
United Airlines Logo
7:59 pm - 9:09 pmPHL-IAD
1h 10mnonstop
United Airlines Logo
8:29 am - 9:39 amIAD-PHL
1h 10mnonstop
$240United Airlines
Find Deal
Wed, May 28 - Wed, Jun 4
United Airlines Logo
6:15 am - 7:21 amPHL-IAD
1h 06mnonstop
United Airlines Logo
10:15 pm - 11:29 pmIAD-PHL
1h 14mnonstop
$244United Airlines
Find Deal
Fri, May 16 - Tue, May 27
United Airlines Logo
6:05 am - 7:15 amPHL-IAD
1h 10mnonstop
United Airlines Logo
10:05 pm - 11:14 pmIAD-PHL
1h 09mnonstop
$249United Airlines
Find Deal
Sun, Jun 29 - Sat, Jul 5
 Logo
4:00 pm - 2:44 pmPHL-IAD
22h 44m1 stop
 Logo
9:43 pm - 7:48 amIAD-PHL
34h 05m2 stops
Fri, May 30 - Sat, Jun 7
American Airlines Logo
6:00 am - 1:22 pmPHL-IAD
7h 22m1 stop
American Airlines Logo
5:02 am - 8:57 amIAD-PHL
3h 55m1 stop
$289American Airlines
Find Deal
Tue, May 27 - Tue, Jun 3
American Airlines Logo
6:00 am - 1:22 pmPHL-IAD
7h 22m1 stop
American Airlines Logo
8:14 pm - 12:08 amIAD-PHL
3h 54m1 stop
$290American Airlines
Find Deal
Fri, May 30 - Sat, Jun 7
American Airlines Logo
11:50 am - 4:56 pmPHL-IAD
5h 06m1 stop
American Airlines Logo
8:02 pm - 12:46 amIAD-PHL
4h 44m1 stop
$349American Airlines
Find Deal
Thu, May 22 - Sun, May 25
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 offers public transportation via SEPTA trains to Center City, taking about 30 minutes. Purchase a Quick Trip or SEPTA Key card for savings.

Read more about PHLby Harriet Baskas
IAD

Use the Silver Line Metro for a 50-minute ride from IAD to downtown D.C. It's a cost-effective option, though not 24-hour.

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
Useful Info

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.

What is the cheapest month to fly from Philadelphia 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 Philadelphia 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 Philadelphia to Washington, D.C. Dulles Intl Airport is August, where tickets cost $197 (return) on average. On the other hand, the most expensive months are February and April, where the average cost of round-trip tickets is $483 and $407 respectively.

Can I save money by flying with a layover from Philadelphia 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 $721, prices are generally cheapest when you fly direct.

Good to know

Low seasonOctober
High seasonJuly
Cheapest flight$179
Best time to beat the crowds but there is an average 1% increase in price.
Most popular time to fly and prices are also 18% 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 $196 for a one-way ticket and $179 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, Finnair, Japan Airlines, Delta, British Airways, Iberia, Alaska Airlines, and Aer Lingus.

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

    The Boeing 787-8 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 $274 or less one-way and $638 or less round-trip.

Prefer to fly direct from Philadelphia to Washington Dulles Airport?

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

ANA, Air Canada, Avianca, +3 more

ANA, Air Canada, +4 more

Tuesday

ANA, Air Canada, Air China, +3 more

ANA, Air Canada, +4 more

Wednesday

ANA, Air Canada, Avianca, +2 more

ANA, Air Canada, +3 more

Thursday

ANA, Air Canada, Avianca, +2 more

ANA, Air Canada, +3 more

Friday

ANA, Air Canada, Air China, +3 more

ANA, Air Canada, +4 more

Saturday

ANA, Air Canada, Air China, +4 more

ANA, Air Canada, +5 more

Sunday

ANA, Air Canada, Avianca, +2 more

ANA, Air Canada, +3 more

See more direct flights

Direct returns

Washington, D.C. Dulles Intl to Philadelphia

Monday

ANA, Air Canada, Avianca, +4 more

ANA, Air Canada, +5 more

Tuesday

ANA, Air Canada, Air China, +4 more

ANA, Air Canada, +5 more

Wednesday

ANA, Air Canada, Avianca, +3 more

ANA, Air Canada, +4 more

Thursday

ANA, Air Canada, Avianca, +3 more

ANA, Air Canada, +4 more

Friday

ANA, Air Canada, Air China, +4 more

ANA, Air Canada, +5 more

Saturday

ANA, Air Canada, Avianca, +4 more

ANA, Air Canada, +5 more

Sunday

ANA, Air Canada, Avianca, +4 more

ANA, Air Canada, +5 more

See more direct flights
See more direct flights

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 8696 reviews
6.6Food
7.3Comfort
8.1Crew
7.1Entertainment
7.7Boarding
Airline reviews

Mostly the experience was good except for the flight changes made by UA which meant longer layover in DC

10.0 ExcellentAnonymous, Mar 2025GUA - IAD
Read more United Airlines reviews

Mostly the experience was good except for the flight changes made by UA which meant longer layover in DC

Terrible. First of all we were delayed 4 3/4 hours departing Honolulu. As we had to leave our condo and the rental car had to be returned we had to go to the airport. Even though we had a business class boarding pass to Washington, since we did not have business class to Montreal we could not access the lounge without paying a $59 fee each. This does not make sense to us. Since we could not meet our original connection United booked us to Montreal via New York LaGuardia on Air Canada. In Washington a further delay got us into LaGuardia too late to make our connection to Montreal so we were booked on another Air Canada flight 3 hours later. We were originally scheduled to arrive in Montreal at 10:40 and arrived at 19:55. A totally exhausting day, United did not offer a meal voucher or any type of compensation. Air Canada did give us a digital meal voucher. The food in United business class is poor among all meals offered. The pods look nice but are not that confortable. Overall would not fly on United again.

Change cabin crew assisting business class. Not taking care, ignoring requests and calls. Never had such an experience in business class.

United left one of our bags back in SFO but that’s not my real complaint. The complaint is how it all went down. So we checked in the day before online and were told we could use the quick drop for luggage. So the next day I used baggage quick drop curbside at SFO. The agent mistakenly didn't tag my bag as he put my bag on the conveyor belt untagged. We immediately alerted him he had not tagged the bag. I walked with him to the baggage service office to find my bag and tag it. We waited outside the office for 10 mins. He came out and said everything was ok and the bag was going to be tagged and on my flight. We received a text that one of our bags was on the flight but the other was not. I alerted my first class flight attendant immediately upon boarding the flight. She was helpful and said she’d get it sorted out right away. She called over the gate agent. The gate agent used my bag number and looked over information on her device. She said my bag was on the flight. The flight attendant was standing with her, looking at the device, and also said “yep it’s on the flight”. During the flight the flight attendant made reference to how reassuring it must feel knowing the bag was on the flight. Upon arriving to IAD we received a text that my bag was not on my flight. The text said my bag would arrive to my final destination LIS 24 hrs late. I understand that mistakes happen. I was totally ok with my bag mistakenly not getting tagged at the quick drop. I was fine with walking down to baggage services to tag my bag. But, what I am not ok with is that the United staff said they fixed the mistake two different times, assuring me twice that my bag would be/was on the plane…and it wasn’t. I expected better attention by the employees, for them to do what they said they were going to do. We also spent extra money to upgrade our seats to first class, including the entire return leg from Lisbon to San Francisco because we wanted a smoother and more relaxing travel experience. Our money was not well spent. We will not be using United for travel going forward.

The flight was delayed, it took longer than anticipated because of weather, and they broke my luggage.

Horrifying! And I am almost 2 million miles with United. Late by 3 1/2 hours. Worst: after two hours on the plane waiting, they decided that one of the tires had been damaged and then decided to change it. Another hour and a half to change the tire!!!!! NO EXCUSE FOR THIS. The crew didn't even offer a glass of water until we had been on the plane for FIVE hours. This is the worst airline in the world. I'm simply stuck because they fly on the only routes I need.

Gate got changed about 4 times. Very confusing and very crowded. If you don’t have wifi to help get updates, you can be in deep trouble.

Attendants zipped through cabin so fast hardly anyone got the water they told us we could have in the short flight. Nothing else was offered.

Sucks ! All three flights I was on this trip were delayed.

The flight attendants were unhelpful. It was a packed flight, and usually a flight attendant would help find a spot in the bin for your carry on or shift things around. Neither made any effort to do so. Also, I had to then check my bag. I was told it would be on the carousel in YYZ, but it came up on the jetway. So lucky I saw others standing around for their bags. I would have walked straight past this and on to the carousel. They could have at least told me that they had given me wrong information. Very unsatisfactory.

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

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