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$96+ Cheap flights from Dulles Intl (IAD) to Philadelphia (PHL)

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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — PHL
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
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Cheap flight deals from Dulles Intl to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Philadelphia (PHL). 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 septiembre 11, 2025.

Round-trip from

$152
(Frontier)

One-way from

$96
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$304

Good round-trip deal

$487 or less

Good one-way deal

$404 or less
From Washington, D.C. Dulles Intl to Philadelphia
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One-way flight from Washington, D.C. Dulles Intl to Philadelphia
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Highest demand for flights based on searches. 17% potential increase in price ($78 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Philadelphia.
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Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Philadelphia.
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Find flight deals from Dulles Intl to Philadelphia

Cheapest flights from Dulles Intl to Philadelphia
Explore the most affordable flight options available from Dulles Intl to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 11, 2025.

This Frontier deal was found by Cheapflights users on 9/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/251:55 pmIAD - PHL
1 stop11h 02mFrontier
sáb. 9/276:37 pmPHL - IAD
1 stop5h 18mFrontier
Deal found 9/11$152
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/251:55 pmIAD - PHL
1 stop11h 02mFrontier
lun. 9/2912:30 pmPHL - IAD
1 stop5h 54mFrontier
Deal found 9/10$153
This Frontier deal was found by Cheapflights users on 9/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/117:15 amIAD - PHL
1 stop11h 29mFrontier
sáb. 10/186:15 pmPHL - IAD
1 stop5h 14mFrontier
Deal found 9/11$171
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
vie. 10/243:10 pmIAD - PHL
1 stop9h 15mFrontier
dom. 10/2610:02 pmPHL - IAD
1 stop23h 36mFrontier
Deal found 9/10$172
This United Airlines deal was found by Cheapflights users on 9/10. 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.
vie. 10/2412:50 pmIAD - PHL
Nonstop1h 14mUnited Airlines
dom. 10/268:00 pmPHL - IAD
Nonstop1h 07mUnited Airlines
Deal found 9/10$179
This Frontier deal was found by Cheapflights users on 9/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/26:10 amIAD - PHL
1 stop18h 49mFrontier
dom. 10/55:15 amPHL - IAD
1 stop7h 40mFrontier
Deal found 9/11$180
This United Airlines deal was found by Cheapflights users on 9/9. 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.
mar. 9/238:21 amIAD - PHL
Nonstop1h 12mUnited Airlines
jue. 10/210:32 amPHL - IAD
Nonstop1h 14mUnited Airlines
Deal found 9/9$184
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/287:14 pmIAD - PHL
1 stop12h 21mFrontier
vie. 10/35:15 amPHL - IAD
1 stop13h 04mFrontier
Deal found 9/10$186
This Frontier deal was found by Cheapflights users on 9/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/47:00 amIAD - PHL
1 stop10h 27mFrontier
mar. 10/710:22 amPHL - IAD
1 stop9h 24mFrontier
Deal found 9/11$189
This United Airlines deal was found by Cheapflights users on 9/10. 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.
jue. 11/208:30 amIAD - PHL
Nonstop1h 16mUnited Airlines
dom. 11/2310:34 amPHL - IAD
Nonstop1h 06mUnited Airlines
Deal found 9/10$190
This Frontier deal was found by Cheapflights users on 9/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/79:00 amIAD - PHL
1 stop7h 35mFrontier
mar. 10/1410:22 amPHL - IAD
1 stop9h 24mFrontier
Deal found 9/9$193

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Philadelphia 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 septiembre 11, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Philadelphia that are best for you.

Fly from

Dulles Intl

Fly to

Philadelphia

Route

Depart

Return

Price

Washington, D.C.Philadelphia

IAD - PHL

IADPHL

Washington, D.C. Dulles Intl

jue. 9/25

1:55 pm-12:57 am

1 stop11h 02m

Philadelphia

sáb. 9/27

6:37 pm-11:55 pm

1 stop5h 18m

$153

Washington, D.C.Philadelphia

IAD - PHL

IADPHL

Washington, D.C. Dulles Intl

vie. 10/24

3:10 pm-12:25 am

1 stop9h 15m

Philadelphia

dom. 10/26

10:02 pm-9:38 pm

1 stop23h 36m

$172

Washington, D.C.Philadelphia

IAD - PHL

IADPHL

Washington, D.C. Dulles Intl

vie. 10/3

8:30 am-9:46 am

Nonstop1h 16m

Philadelphia

dom. 10/5

10:32 am-11:45 am

Nonstop1h 13m

$179

Washington, D.C.Philadelphia

IAD - PHL

IADPHL

Washington, D.C. Dulles Intl

mié. 10/8

12:50 pm-2:04 pm

Nonstop1h 14m

Philadelphia

mié. 10/15

10:32 am-11:45 am

Nonstop1h 13m

$179

Washington, D.C.Philadelphia

IAD - PHL

IADPHL

Washington, D.C. Dulles Intl

sáb. 11/22

8:22 am-9:27 am

Nonstop1h 05m

Philadelphia

dom. 11/23

8:00 pm-9:07 pm

Nonstop1h 07m

$179

Washington, D.C.Philadelphia

IAD - PHL

IADPHL

Washington, D.C. Dulles Intl

mar. 10/7

8:30 am-9:46 am

Nonstop1h 16m

Philadelphia

mar. 10/14

7:58 pm-9:05 pm

Nonstop1h 07m

$179

Washington, D.C.Philadelphia

IAD - PHL

IADPHL

Washington, D.C. Dulles Intl

vie. 10/24

12:50 pm-2:04 pm

Nonstop1h 14m

Philadelphia

dom. 10/26

10:34 am-11:40 am

Nonstop1h 06m

$179

Washington, D.C.Philadelphia

IAD - PHL

IADPHL

Washington, D.C. Dulles Intl

sáb. 10/4

12:50 pm-2:04 pm

Nonstop1h 14m

Philadelphia

mar. 10/7

7:58 pm-9:05 pm

Nonstop1h 07m

$179

Washington, D.C.Philadelphia

IAD - PHL

IADPHL

Washington, D.C. Dulles Intl

sáb. 10/11

12:50 pm-2:04 pm

Nonstop1h 14m

Philadelphia

sáb. 10/18

10:32 am-11:45 am

Nonstop1h 13m

$179

Washington, D.C.Philadelphia

IAD - PHL

IADPHL

Washington, D.C. Dulles Intl

sáb. 10/4

7:00 am-5:27 pm

1 stop10h 27m

Philadelphia

mar. 10/7

10:22 am-7:46 pm

1 stop9h 24m

$189

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 20 results
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The best insider tips for Washington, D.C. Dulles Intl Airport to Philadelphia flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-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.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to Philadelphia trip
Airports
IAD

For a smooth departure, use the Aerotrain to reach distant gates quickly. Pay attention to signage as it's not a loop system.

Read more about IADby Ramsey Qubein
PHL

To reach downtown, SEPTA trains are efficient. Stations are near Terminals A, B, C/D, and E/F, with service from 5 a.m. to midnight.

Read more about PHLby Mark Chesnut
Our travel experts
Mark Chesnut

Mark Chesnut

Expert on PHL

Mark Chesnut

Mark Chesnut

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

Ramsey Qubein

Ramsey Qubein

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

Best time to book a flight from Dulles Intl to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to Philadelphia

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

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Philadelphia (average of $236). Flying from Washington, D.C. Dulles Intl Airport to Philadelphia in March is currently the most expensive (average of $295). 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 IAD to PHL?

Find hourly flight availability from Dulles Intl to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 11, 2025.

One of the essential ways to save on airfare from Washington, D.C. Dulles Intl Airport to Philadelphia is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 42% on airfare.

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. 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 Philadelphia. Reviews last updated septiembre 11, 2025.
Get a feel of what it's like to fly with United Airlines from Washington, D.C. Dulles Intl Airport to Philadelphia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,937 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
United Airlines
7.4
Good
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Philadelphia. 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 into for flights to Philadelphia from Washington, D.C. Dulles Intl?

    Philadelphia (PHL), located 7.0 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. Dulles Intl to Philadelphia. 1 airline have flights to Philadelphia from Washington, D.C. Dulles Intl on a regular basis. Booking flights from Washington, D.C. Dulles Intl to Philadelphia should not be difficult; the airport handles an average of 7 inbound flights from Washington, D.C. Dulles Intl per day.

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

    A quick flight from Washington, D.C. Dulles Intl Airport to Philadelphia can take about 1h 16m. Frontier provides one of the quickest options available for as low as $179. The distance between Washington, D.C. Dulles Intl Airport and Philadelphia is about 134 mi. This flight may include one or multiple stops.

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

    United Airlines, at $179, was found to be the cheapest airline from Washington, D.C. Dulles Intl Airport to Philadelphia.. Users have found that United Airlines is 50% cheaper than the other options available to this destination.

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

    The top 3 most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to Philadelphia are Air Canada (89%), Mesa Airlines (83%) and ANA (77%).

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

    The cheapest flight price from Washington, D.C. Dulles Intl Airport to Philadelphia is $239. On average you can expect to pay $502. The most popular route, (Washington, D.C. Dulles Intl - Philadelphia), can usually be booked for $179.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Dulles Intl to Philadelphia 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 Washington, D.C. Dulles Intl Airport to Philadelphia?

    Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Philadelphia (average of $236). Flying from Washington, D.C. Dulles Intl Airport to Philadelphia in March is currently the most expensive (average of $295). 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 Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Vineland
Wildwood
King of Prussia
Pottstown
Reading
Dewey Beach
Ephrata
Camden
Ocean City
Cherry Hill
Dover
Elkton
Essington
Willow Grove
Newark
Millville
Chester
Exton
Havre de Grace
Plymouth Meeting

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Alternative routes for Dulles Intl to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to John F Kennedy Intl flights
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Reagan-National to Williamsport flights
Baltimore to Williamsport flights

Top airline flying from Dulles Intl to Philadelphia

Discover the top airline that operate flights from Dulles Intl to Philadelphia. 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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$179Average$357FlexibilityNo cancel feeOn-time69%

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