PHL - IAD

$104 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 4/14. 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 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
Travelers love KAYAK
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Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$219
United Airlines
Fri 4/3Sat 4/4
PHL - IAD • Non-stop
Cheapest one-way
$104
Typical prices: $263-$428
Multiple Airlines
Tue 4/14
PHL - IAD • 2 stops
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
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
United Airlines
Cheapest • from $219 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Every day
You can fly direct with United Airlines. Average duration is 1h 12m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Dulles Intl!
Flight Deals
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Expert advice
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

Fri, Apr 3 - Sat, Apr 4
United Airlines Logo
7:45 pm - 8:55 pm
PHL
-
IAD
1h 10mnonstop
United Airlines Logo
5:35 pm - 6:55 pm
IAD
-
PHL
1h 20mnonstop
$219United Airlines
Wed, Apr 29 - Sat, May 2
Multiple Airlines Logo
5:45 am - 12:36 am
PHL
-
IAD
18h 51m
2 stops
Multiple Airlines Logo
10:51 am - 8:10 am
IAD
-
PHL
21h 19m
1 stop
$221Multiple Airlines
Thu, Apr 16 - Mon, Apr 20
Multiple Airlines Logo
9:17 am - 12:36 am
PHL
-
IAD
15h 19m
1 stop
Multiple Airlines Logo
6:00 am - 9:57 pm
IAD
-
PHL
15h 57m
1 stop
$222Multiple Airlines
Thu, Apr 16 - Mon, Apr 20
Frontier Logo
9:17 am - 12:36 am
PHL
-
IAD
15h 19m
1 stop
Frontier Logo
6:19 pm - 11:51 am
IAD
-
PHL
17h 32m
2 stops
$236Frontier
Fri, Apr 10 - Fri, Apr 17
United Airlines Logo
7:45 pm - 8:55 pm
PHL
-
IAD
1h 10mnonstop
United Airlines Logo
12:55 pm - 2:10 pm
IAD
-
PHL
1h 15mnonstop
$239United Airlines
Thu, Apr 30 - Mon, May 4
Multiple Airlines Logo
7:00 am - 6:42 pm
PHL
-
IAD
11h 42m
1 stop
Multiple Airlines Logo
6:00 am - 1:15 pm
IAD
-
PHL
7h 15m
1 stop
$241Multiple Airlines
Thu, Apr 30 - Mon, May 4
Multiple Airlines Logo
7:00 am - 6:42 pm
PHL
-
IAD
11h 42m
1 stop
Multiple Airlines Logo
6:00 am - 1:15 pm
IAD
-
PHL
7h 15m
1 stop
$244Multiple Airlines
Fri, May 1 - Fri, May 8
Multiple Airlines Logo
7:00 am - 12:36 am
PHL
-
IAD
17h 36m
1 stop
Multiple Airlines Logo
6:17 pm - 9:49 am
IAD
-
PHL
15h 32m
2 stops
$245Multiple Airlines
Thu, May 14 - Mon, May 25
United Airlines Logo
7:45 pm - 8:55 pm
PHL
-
IAD
1h 10mnonstop
United Airlines Logo
8:35 am - 9:45 am
IAD
-
PHL
1h 10mnonstop
$253United Airlines
Fri, May 1 - Fri, May 8
Multiple Airlines Logo
7:00 am - 12:36 am
PHL
-
IAD
17h 36m
1 stop
Multiple Airlines Logo
11:12 am - 10:10 pm
IAD
-
PHL
10h 58m
1 stop
$257Multiple Airlines
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 Thursday is the most expensive. Flying from Washington Dulles Airport back to Philadelphia, the best deals are generally found on Friday, with Tuesday being the most expensive.

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.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $455 on average.

Find deals
Expert advice

Expert advice for your flight from Philadelphia to Dulles Intl

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on ANA

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 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 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

Good to know

Cheapest flight$104
Most popular time to fly with an average 35% increase in price.
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 $103 for a one-way ticket and $219 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, Iberia, British Airways, Aer Lingus, Delta, SWISS, and Alaska Airlines.

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

    The Airbus A321neo 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 $317 or less one-way and $587 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 9431 reviews
7.7Boarding
7.1Entertainment
7.3Comfort
8.1Crew
6.6Food
Airline reviews

It was okay, the food was good, but after the landing there was not enough time for luggage and security to catch a connection. It was crowded on board.

6.0 GoodOlga, Mar 2026
FRA - IAD
Read more United Airlines reviews

It was okay, the food was good, but after the landing there was not enough time for luggage and security to catch a connection. It was crowded on board.

When I went to check in at the United counter in Barcelona, Spain I had 2 different menat 2 different times in United uniforms (standing around with a couple other employees) ask me if I was traveling alone. The one man asked me 3 different ways if I was traveling alone. I am, 68 yeaers old and have all my faculties. I thought it was weird and it made me feel very uncomfortable. What difference does it make if I was traveling alone or with someone? What if I was a recent widow? That would have been horrible. They never gave me a reason why they needed to know who I was traveling with. I was hesitant to question them because I needed to be on that flight.

Crew was great. 2 1/2 hour delay was due to staff needing "rest" was avoidable and self inflicted as United not willing to hire enough crew to keep flight on time.. Ridiculous. The crew and the passengers both suffered due to this.

Fine not above and beyond as I had a connection that was delayed due to maintenance

Bad food, bad service, cold cabin with no additional blankets when asked for (they told me they don’t provide additional blankets). I’m a frequent traveler and this is one of the worst companies I traveled with (by the way I thought that I booked my ticket with Lufthansa but I didn’t see that the flights were handled by United).

Great other than a couple very drunk guys that for a while kept bumping my seat from behind. The staff did their best to control them. Even refused serving them alcohol and allowed the gal sitting next to them to move.

Good crew. Boarding delays. Almost two hours wait for the bags in DC.

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

It was great. There were some issues prior to takeoff. The weather was poor so we had to go through deicing, and we were delayed a bit by the pilots' concern about one of the engines, but that's aviation. The pilots handled everything with aplomb, and kept us apprised

The seats were comfortable and we had leg room. Great entertainment.

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

Information on your arrival and departure airports

Philadelphia (PHL)
Dulles Intl (IAD)