PHL - IAD

$93 Find Cheap Flights from Philadelphia to Washington Dulles Airport - Compare and Save

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 8/13. 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

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Everything you should know

Cheapest round-trip
$136
Typical prices: $356-$413
Frontier
Tue 11/3Sat 11/14
PHL - IAD • 1 stop
Cheapest non-stop
$249
Typical prices: $345-$618
United Airlines
Fri 10/30Mon 11/2
PHL - IAD • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
On United, Priority Boarding helps keep your carry-on out of gate check.
United Economy Plus adds up to six inches more legroom than standard economy.
Expert advice
Expert advice
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Top airlines
Cheapest • from $136 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
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Airline reviews
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Nonstop flights
You can fly direct with United Airlines. Average duration is 1h 13m
Direct flights
Direct flights
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Direct flights
Direct flights
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When to travel
Cheapest • 100% price drop
Most popular
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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, Nov 3 - Sat, Nov 14
Frontier Logo
5:28 pm - 12:28 am
PHL
-
IAD
7h 00m
1 stop
Frontier Logo
7:00 am - 1:12 pm
IAD
-
PHL
6h 12m
1 stop
$136Frontier
Mon, Aug 17 - Mon, Aug 24
Frontier Logo
4:40 pm - 10:52 pm
PHL
-
IAD
6h 12m
1 stop
Frontier Logo
8:39 pm - 7:15 am
IAD
-
PHL
10h 36m
1 stop
$136Frontier
Tue, Nov 10 - Wed, Nov 11
Frontier Logo
9:14 am - 5:36 pm
PHL
-
IAD
8h 22m
1 stop
Frontier Logo
9:16 pm - 7:36 am
IAD
-
PHL
10h 20m
1 stop
$144Frontier
Tue, Aug 25 - Tue, Sep 1
Frontier Logo
4:45 pm - 10:52 pm
PHL
-
IAD
6h 07m
1 stop
Frontier Logo
6:20 am - 12:26 pm
IAD
-
PHL
6h 06m
1 stop
$186Frontier
Sat, Sep 19 - Sat, Sep 26
Frontier Logo
12:40 pm - 12:10 am
PHL
-
IAD
11h 30m
1 stop
Frontier Logo
7:50 am - 6:14 pm
IAD
-
PHL
10h 24m
1 stop
$188Frontier
Sat, Sep 19 - Sat, Sep 26
Frontier Logo
12:40 pm - 12:10 am
PHL
-
IAD
11h 30m
1 stop
Frontier Logo
7:50 am - 6:14 pm
IAD
-
PHL
10h 24m
1 stop
$190Frontier
Sat, Sep 19 - Sat, Sep 26
Frontier Logo
12:40 pm - 12:10 am
PHL
-
IAD
11h 30m
1 stop
Frontier Logo
9:04 pm - 7:16 am
IAD
-
PHL
10h 12m
1 stop
$190Frontier
Tue, Aug 25 - Tue, Sep 1
Frontier Logo
8:30 am - 5:14 pm
PHL
-
IAD
8h 44m
1 stop
Frontier Logo
6:20 am - 10:33 pm
IAD
-
PHL
16h 13m
1 stop
$191Frontier
Sat, Aug 22 - Sat, Aug 29
United Airlines Logo
7:40 pm - 9:01 pm
PHL
-
IAD
1h 21mnonstop
United Airlines Logo
1:05 pm - 2:21 pm
IAD
-
PHL
1h 16mnonstop
$249United Airlines
Fri, Aug 21 - Sun, Aug 23
United Airlines Logo
10:30 am - 11:39 am
PHL
-
IAD
1h 09mnonstop
United Airlines Logo
1:05 pm - 2:21 pm
IAD
-
PHL
1h 16mnonstop
$249United 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, Friday 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 Tuesday 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 September, where tickets cost $0 (return) on average. On the other hand, the most expensive months are October and August, where the average cost of round-trip tickets is $823 and $708 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.

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.

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.

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.

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.

Good to know

Cheapest flight

$93
Most popular time to fly with an average 1% 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 5 days, the lowest price for a flight from Philadelphia to Washington, D.C. Dulles Intl Airport was $75 for a one-way ticket and $136 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?

    American Airlines, Finnair, Iberia, JetBlue, and British Airways offer inflight Wi-Fi service on the Philadelphia to Washington Dulles Airport flight route.

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

    The Airbus A319 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 $333 or less one-way and $753 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 10049 reviews
8.1Crew
7.1Entertainment
7.7Boarding
6.6Food
7.3Comfort
Airline reviews

Our flight was great with an unexpected upgrade. However, four days into our travel we are still without a piece of luggage. The bag tracker has not been accurate, the airline is not communicating with me or the luggage delivery service and no one is willing to take responsibility or guarantee any kind of support or reimbursement. Unfortunately, we do not have the option to easily shop to replace items as we are currently on a cruise. I have been very disappointed by United Airlines response.

6.0 GoodValerie, Jul 2026
STL - IAD
Read more United Airlines reviews

Our flight was great with an unexpected upgrade. However, four days into our travel we are still without a piece of luggage. The bag tracker has not been accurate, the airline is not communicating with me or the luggage delivery service and no one is willing to take responsibility or guarantee any kind of support or reimbursement. Unfortunately, we do not have the option to easily shop to replace items as we are currently on a cruise. I have been very disappointed by United Airlines response.

It was terribly delayed with zero support from united airlines. I reached at 1 am in the night. They did not provide any option to change the flights.

Flight was delayed 14 hours due to DC air show and weather. Missed connection to MUC.

Horrible I am at almost 2,000,000 miles on United. This was probably the worst flight ever. An hour and a half before takeoff I get a message that they’re changing the plane and I no longer have a seat in Polaris business Supposedly, there was a problem with the plane, but then there was no other plane Finally, they decided to bring a plane from Newark to Washington Dulles Of course the original flight was at 10:45 PM so by the time the plane got there it was 12:30 AM. It had not been cleaned. It had not been catered. They don’t really have people available to do those things when it’s not pre-programmed at 1 o’clock in the morning. The crew had to be changed And the new plane held 28 fewer people than the scheduled plane There is no way you can hate United Airlines enough The people at the gate were actually just fine, but it was management who was completely useless And did they send extra help to the people at the gate? Did they send supervisors? Of course not. Just don’t take United find somebody else or buy a boat

MY FAMILY'S LUGGAGE WAS LOST FROM ROME TO BARI. I WAS THE ONLY ONE THAT RECEIVED MY LUGGAGE FROM ROME TO BARI. AFTER DEPLANING IN BARI, WE WASTED A LOT OF TIME AT BAG CLAIMS LOST AND FOUND REPORTING THE CLAIM AND PLEADING FOR THE BAGS TO BE DELIVERED THE NEXT DAY. WE WERE TOLD THAT IT TAKES 3 DAYS MINIMUM TO DELIVER. MY DAUGHTER AND MY GIRLFRIEND NEEDED THEIR PERSONAL THINGS AND WE WERE STAYING 3 HOURS AWAY FROM THE BARI AIRPORT. WE HAD TO DRIVE 3 HOURS TO THE AIRPORT TO COLLECT OUR LOST LUGGAGE THE NEXT DAY. WE ARE NOT HAPPY WITH THE EXPERIENCE

Our flight to Rome, Italy was cancelled the day of and we were never informed. We only found out because I was trying to get into my husbands account and called to get his account number. Had to pay more for worse seating on another airline.

Miserable. They moved my seat, but canceled the next leg of my flight. I resolved the issue at my transfer, but that resulted in lost luggage that has taken days off my schedule with no resolution. Worse, they fail to interface effectively with Lufthansa, forcing me to bounce between two equally useless help desks. The apps are unable to handle the situation, the bag dropped off the tracker, and while the call centers are polite, they do not provide written information to assist with cross-airline communication.

The only downside was my cell phone charger wouldn’t work in the charging port but everyone else’s would work in them all. My cell phone cable works fine in my hotel room in Frankfurt.

Smoothly flight, pleasant flight attendants. I wish there were better food choices.

A three (3) hour flight should have meal service in First Class, not just potato chips!

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

Information on your arrival and departure airports