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Dulles Intl

$70+ 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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — IAD
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
1 adult, Economy
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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 March 10, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/8. 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.
Wed 4/2211:02 am
PHL
-
IAD
1 stop13h 34m
Frontier
Wed 4/296:20 am
IAD
-
PHL
2 stops14h 20m
Frontier
Deal found 3/8$155
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 5/59:17 am
PHL
-
IAD
1 stop15h 19m
Multiple Airlines
Fri 5/88:09 am
IAD
-
PHL
1 stop8h 58m
Multiple Airlines
Deal found 3/6$195
This United Airlines deal was found by Cheapflights users on 3/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/77:45 pm
PHL
-
IAD
Nonstop1h 10m
United Airlines
Sun 5/101:05 pm
IAD
-
PHL
Nonstop1h 15m
United Airlines
Deal found 3/6$199
This Kiwi.com deal was found by Cheapflights users on 3/5. 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 4/2111:02 am
PHL
-
IAD
1 stop13h 34m
Multiple Airlines
Fri 4/243:34 pm
IAD
-
PHL
2 stops9h 20m
Multiple Airlines
Deal found 3/5$213
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 5/75:05 am
PHL
-
IAD
1 stop19h 31m
Frontier
Sun 5/109:51 am
IAD
-
PHL
2 stops19h 43m
Frontier
Deal found 3/6$216
This United Airlines deal was found by Cheapflights users on 3/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/310:33 am
PHL
-
IAD
Nonstop1h 13m
United Airlines
Mon 4/612:55 pm
IAD
-
PHL
Nonstop1h 15m
United Airlines
Deal found 3/9$219
This United Airlines deal was found by Cheapflights users on 3/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/37:45 pm
PHL
-
IAD
Nonstop1h 10m
United Airlines
Sun 4/55:35 pm
IAD
-
PHL
Nonstop1h 19m
United Airlines
Deal found 3/9$220
This United Airlines deal was found by Cheapflights users on 3/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/207:45 pm
PHL
-
IAD
Nonstop1h 13m
United Airlines
Sat 3/218:32 am
IAD
-
PHL
Nonstop1h 15m
United Airlines
Deal found 3/5$229

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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$155
(Kiwi.com)

One-way from

$70
(Kiwi.com)

Popular in

August

Cheapest in

January

Average price

$489

Good round-trip deal

$581 or less

Good one-way deal

$310 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.
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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. 9% potential increase in price ($37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 10, 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 6/5

10:32 am-11:48 am

Nonstop1h 16m

Washington, D.C. Dulles Intl

Sun 6/7

12:55 pm-2:10 pm

Nonstop1h 15m

$199

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 4/3

7:45 pm-8:55 pm

Nonstop1h 10m

Washington, D.C. Dulles Intl

Fri 4/10

8:39 am-9:58 am

Nonstop1h 19m

$199

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 3/20

7:45 pm-8:58 pm

Nonstop1h 13m

Washington, D.C. Dulles Intl

Sat 3/21

8:32 am-9:47 am

Nonstop1h 15m

$229

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 3/27

10:35 am-11:48 am

Nonstop1h 13m

Washington, D.C. Dulles Intl

Fri 4/3

8:30 am-9:50 am

Nonstop1h 20m

$234

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Sat 3/28

10:35 am-11:48 am

Nonstop1h 13m

Washington, D.C. Dulles Intl

Sat 4/4

5:35 pm-6:55 pm

Nonstop1h 20m

$234

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Sat 3/21

10:35 am-11:48 am

Nonstop1h 13m

Washington, D.C. Dulles Intl

Tue 3/24

1:02 pm-2:17 pm

Nonstop1h 15m

$244

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Wed 5/20

7:45 pm-8:55 pm

Nonstop1h 10m

Washington, D.C. Dulles Intl

Mon 5/25

12:55 pm-2:10 pm

Nonstop1h 15m

$259
Quickest round-trip

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Mon 6/1

6:10 am-7:19 am

Nonstop1h 09m

Washington, D.C. Dulles Intl

Sun 6/7

10:34 pm-11:44 pm

Nonstop1h 10m

$259

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Sat 3/21

1:46 pm-8:30 pm

1 stop6h 44m

Washington, D.C. Dulles Intl

Tue 3/24

11:30 am-5:09 pm

1 stop5h 39m

$279

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Thu 4/2

10:33 am-11:46 am

Nonstop1h 13m

Washington, D.C. Dulles Intl

Thu 4/9

12:55 pm-2:10 pm

Nonstop1h 15m

$309

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/8

Showing 1-10 of 21 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 March.
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 month to book a flight from Philadelphia to Washington, D.C. Dulles Intl Airport?

Currently, June is the cheapest month in which you can book a flight from Philadelphia to Washington, D.C. Dulles Intl Airport (average of $64). Flying from Philadelphia to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $136). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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 March 10, 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 at noon tend to be the most expensive. A flight in the morning could potentially save you up to 30% 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 February 21, 2026.

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

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 March 10, 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
9,409 reviews

Entertainment

7.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Crew

8.1

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
9,409 reviews
United Airlines
7.4
Good
9,409 reviews

Entertainment

7.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Crew

8.1

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 8 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 $199, United Airlines can have you in Washington, D.C. Dulles Intl Airport from Philadelphia in 1h 16m. 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 $189. United Airlines is currently priced 47% 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 Ethiopian Air (100%), Air China (88%) or Air Canada (88%) 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 $208. On average you can expect to pay $806. The most popular route, (Philadelphia - Washington, D.C. Dulles Intl), can usually be booked for $199.

  • 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.

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

    Currently, June is the cheapest month in which you can book a flight from Philadelphia to Washington, D.C. Dulles Intl Airport (average of $64). Flying from Philadelphia to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $136). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Silver Spring
Herndon
Hyattsville
Hanover
Laurel
Rockville
Upper Marlboro
Linthicum Heights
Fredericksburg
Largo
Bowie
Clinton
Towson
College Park

Browse thousands of different options on Cheapflights for your next trip

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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 March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$189Average$388FlexibilityNo cancel feeOn-time69%

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