HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Dulles Intl

$63+ Cheap flights from Philadelphia (PHL) to Dulles Intl (IAD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — IAD
Aug 20 — Aug 271
Thu 8/20
Thu 8/27
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Philadelphia to Dulles Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Philadelphia to Dulles Intl

Cheapest flights from Philadelphia to Dulles Intl
Explore the most affordable flight options available from Philadelphia to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 21, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/115:28 pm
PHL
-
IAD
1 stop7h 00m
Frontier
Fri 10/99:16 pm
IAD
-
PHL
1 stop10h 20m
Frontier
Deal found 7/19$129
This Kiwi.com deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/254:45 pm
PHL
-
IAD
1 stop6h 07m
Frontier
Mon 8/318:39 pm
IAD
-
PHL
1 stop10h 36m
Frontier
Deal found 7/16$131
This Kiwi.com deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/225:38 pm
PHL
-
IAD
1 stop6h 50m
Frontier
Sat 10/247:00 am
IAD
-
PHL
1 stop6h 12m
Frontier
Deal found 7/18$141
This Kiwi.com deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/64:45 pm
PHL
-
IAD
1 stop6h 07m
Frontier
Fri 9/117:00 am
IAD
-
PHL
1 stop6h 12m
Frontier
Deal found 7/20$143
This Kiwi.com deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/174:40 pm
PHL
-
IAD
1 stop6h 12m
Frontier
Mon 8/248:39 pm
IAD
-
PHL
1 stop10h 36m
Frontier
Deal found 7/18$155
This Kiwi.com deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/118:30 am
PHL
-
IAD
1 stop8h 10m
Frontier
Tue 8/186:20 am
IAD
-
PHL
1 stop6h 06m
Frontier
Deal found 7/18$158
This Kiwi.com deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:25 am
PHL
-
IAD
1 stop10h 15m
Frontier
Sun 8/168:33 pm
IAD
-
PHL
1 stop10h 42m
Frontier
Deal found 7/20$182
This Kiwi.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/34:45 pm
PHL
-
IAD
1 stop6h 07m
Frontier
Mon 9/78:39 pm
IAD
-
PHL
1 stop10h 36m
Frontier
Deal found 7/19$187

Find flight deals from Philadelphia to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$129
(Kiwi.com)

One-way from

$63
(Kiwi.com)

Popular in

May

Cheapest in

January

Average price

$330

Good round-trip deal

$725 or less

Good one-way deal

$358 or less
Provider with most accurate pricing for Philadelphia-Washington, D.C. Dulles Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Washington, D.C. Dulles Intl flights.
Search Deals
From Philadelphia to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Philadelphia to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($31 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Philadelphia to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from Philadelphia to Washington, D.C. Dulles Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Philadelphia to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 21, 2026.
Use the filters below to find and compare flights from Philadelphia to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 8/14

10:30 am-11:39 am

Nonstop1h 09m

Washington, D.C. Dulles Intl

Fri 8/21

1:05 pm-2:21 pm

Nonstop1h 16m

$239

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Thu 8/20

3:05 pm-4:23 pm

Nonstop1h 18m

Washington, D.C. Dulles Intl

Mon 8/24

8:30 am-9:43 am

Nonstop1h 13m

$239

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Tue 8/25

3:05 pm-4:23 pm

Nonstop1h 18m

Washington, D.C. Dulles Intl

Mon 8/31

1:05 pm-2:21 pm

Nonstop1h 16m

$239

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Thu 9/3

3:05 pm-4:23 pm

Nonstop1h 18m

Washington, D.C. Dulles Intl

Mon 9/7

8:30 am-9:43 am

Nonstop1h 13m

$239

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Tue 8/18

3:05 pm-4:23 pm

Nonstop1h 18m

Washington, D.C. Dulles Intl

Tue 8/25

8:30 am-9:43 am

Nonstop1h 13m

$239

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 10/9

10:40 am-11:49 am

Nonstop1h 09m

Washington, D.C. Dulles Intl

Mon 10/12

8:30 am-9:43 am

Nonstop1h 13m

$239

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Sat 8/8

7:45 pm-9:10 pm

Nonstop1h 25m

Washington, D.C. Dulles Intl

Sun 8/9

8:35 am-9:45 am

Nonstop1h 10m

$254
Quickest round-trip

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 7/31

3:10 pm-4:18 pm

Nonstop1h 08m

Washington, D.C. Dulles Intl

Mon 8/3

8:35 am-9:45 am

Nonstop1h 10m

$269

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 10/9

12:05 pm-6:45 pm

1 stop6h 40m

Washington, D.C. Dulles Intl

Mon 10/12

6:15 am-11:17 am

1 stop5h 02m

$289

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 7/31

7:35 pm-12:10 am

1 stop4h 35m

Washington, D.C. Dulles Intl

Sun 8/2

8:22 pm-12:22 am

1 stop4h 00m

$289

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/16

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Philadelphia to Dulles Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Philadelphia to Dulles Intl in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Philadelphia-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Philadelphia-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Philadelphia-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Philadelphia-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Philadelphia-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Philadelphia to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Philadelphia with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Philadelphia to Washington, D.C. Dulles Intl Airport

What is the cheapest time of day to fly from PHL to IAD?

Find hourly flight availability from Philadelphia to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 21, 2026.

One of the essential ways to save on airfare from Philadelphia to Washington, D.C. Dulles Intl Airport is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the morning could potentially save you up to 39% on airfare.

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

Use this chart to determine the cheapest time to fly round-trip from Philadelphia to Dulles Intl. Price data was last updated on July 18, 2026.

Travelers seeking maximum savings on their Philadelphia to Washington, D.C. Dulles Intl Airport flight should consider departing on Sunday at noon when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Philadelphia to Washington, D.C. Dulles Intl Airport?

The best insider tips for Philadelphia to Washington, D.C. Dulles Intl Airport flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Philadelphia to Washington, D.C. Dulles Intl Airport trip
Our travel experts
Mark Chesnut

Mark Chesnut

Expert on PHL

Mark Chesnut is a travel writer and public speaker with more than 30 years of experience. The 2019 winner of the NLGJA Excellence in Travel Writing Award, Mark is the author of the book “Prepare for Departure” and has covered air travel for multiple top consumer and trade media outlets.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on IAD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated July 21, 2026.
Read through reviews of airlines operating flights from Philadelphia to Washington, D.C. Dulles Intl Airport, such as United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
10,011 reviews

Boarding

7.7

Crew

8.1

Entertainment

7.1

Overall

7.4

Comfort

7.3

Food

6.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
10,011 reviews
United Airlines
7.4
Good
10,011 reviews

Boarding

7.7

Crew

8.1

Entertainment

7.1

Overall

7.4

Comfort

7.3

Food

6.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Philadelphia to Washington, D.C. Dulles Intl?

    If you book a flight to Washington, D.C. Dulles Intl from Philadelphia, you will be flying from Philadelphia, which is the city’s only airport. Philadelphia (PHL) is located 7.0 mi from the center of Philadelphia. There are 10 flights from Philadelphia to Washington, D.C. Dulles Intl per day from 1 airline.

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

    For as low as $239, United Airlines can have you in Washington, D.C. Dulles Intl Airport from Philadelphia in 1h 09m. There are 134 mi between Philadelphia and Washington, D.C. Dulles Intl Airport. All flights are typically nonstop.

  • What is the cheapest airline to fly from Philadelphia to Washington, D.C. Dulles Intl Airport round-trip?

    Flying on United Airlines is currently your cheapest option to Washington, D.C. Dulles Intl Airport, with prices starting at $239. United Airlines is currently priced 44% below the average price you’ll pay for this route.

  • What are the most reliable airlines from Philadelphia to Washington, D.C. Dulles Intl Airport?

    Consider Republic Airways (92%), ANA (91%) or Ethiopian Air (89%) when booking your flight. These represent the most reliable airlines when flying from Philadelphia to Washington, D.C. Dulles Intl Airport.

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

    The cheapest flight price from Philadelphia to Washington, D.C. Dulles Intl Airport is $218. On average you can expect to pay $1,284. The most popular route, (Philadelphia - Washington, D.C. Dulles Intl), can usually be booked for $239.

  • Can I find deals for flights from Philadelphia to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Philadelphia to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to Dulles Intl.

  • Can I find deals for business class flights from Philadelphia to Dulles Intl?

    Yes. Cheapflights offers flight deals from Philadelphia to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Tysons
Arlington
Owings Mills
Springfield
Lanham
Reston
Herndon
Rockville
Chantilly
Hyattsville
Fredericksburg
Falls Church
Hanover
Manassas
Laurel
Sterling
Clinton
Hunt Valley
Cordova

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top airline flying from Philadelphia to Dulles Intl

Discover the top airline that operate flights from Philadelphia to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$239Average$477FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.