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

United Airlines, at $189, was found to be the cheapest airline from Washington, D.C. Dulles Intl Airport to Philadelphia.. Users have found that United Airlines is 52% cheaper than the other options available to this destination.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to Philadelphia

The most flights from IAD to PHL are scheduled on a Monday (11 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (6 on average).

In terms of precipitation, rainfall in Philadelphia ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Philadelphia when rainfall is around 2.7 in.

If weather is an important factor for your trip to Philadelphia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

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 $133. On average you can expect to pay $424. The most popular route, (Washington, D.C. Dulles Intl - Philadelphia), can usually be booked for $249.

Most accurate provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-Philadelphia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-Philadelphia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Philadelphia flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-Philadelphia 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 Washington, D.C. Dulles Intl Airport-Philadelphia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 9 inbound flights from Washington, D.C. Dulles Intl per day.

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.

$82+ Cheap Flights from Washington, D.C. Dulles Intl Airport to Philadelphia

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Dulles Intl to Philadelphia 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 Dulles Intl to Philadelphia

Cheapest

Best

Last-minute

One-way

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 August 26, 2026.

Wed 9/237:50 am -

1 stop10h 24m

Wed 9/308:41 am -

1 stop8h 37m

Deal found 8/26

$130

Sun 10/49:04 pm -

1 stop10h 12m

Sat 10/105:20 pm -

1 stop7h 01m

Deal found 8/26

$145

Thu 10/87:54 am -

1 stop23h 27m

Sat 10/105:20 pm -

1 stop7h 01m

Deal found 8/25

$152

Sat 10/1011:12 am -

2 stops11h 59m

Sat 10/175:20 pm -

1 stop7h 01m

Deal found 8/26

$163

Sat 10/107:50 am -

1 stop15h 21m

Thu 10/156:03 pm -

1 stop6h 18m

Deal found 8/26

$166

Tue 9/229:04 pm -

1 stop10h 12m

Tue 9/2912:40 pm -

1 stop11h 30m

Deal found 8/25

$169

Tue 9/159:04 pm -

1 stop10h 12m

Wed 9/165:32 pm -

1 stop6h 38m

Deal found 8/25

$180

Thu 10/87:36 am -

1 stop23h 45m

Thu 10/156:03 pm -

1 stop6h 18m

Deal found 8/24

$189

Sat 10/39:33 am -

2 stops8h 41m

Sun 10/48:41 am -

1 stop15h 29m

Deal found 8/26

$192

Fri 9/259:04 pm -

1 stop10h 12m

Mon 9/288:41 am -

1 stop8h 37m

Deal found 8/24

$195

Best flights from Dulles Intl to Philadelphia
Discover carefully curated flight deals from Dulles Intl to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 26, 2026.

Fri 10/2310:16 pm -

Nonstop1h 14m

Sun 10/256:00 am -

Nonstop1h 15m

Deal found 8/21

$249

Fri 10/239:06 pm -

1 stop10h 15m

Sun 10/256:03 pm -

1 stop6h 18m

Deal found 8/21

$277

Fri 9/2510:16 pm -

Nonstop1h 14m

Mon 9/287:30 pm -

Nonstop1h 19m

Deal found 8/24

$249

Thu 9/2410:16 pm -

Nonstop1h 14m

Sun 9/277:30 pm -

Nonstop1h 19m

Deal found 8/21

$249

Wed 9/235:36 pm -

Nonstop1h 18m

Wed 9/307:30 pm -

Nonstop1h 19m

Deal found 8/24

$249

Tue 9/221:05 pm -

Nonstop1h 15m

Tue 9/2910:40 am -

Nonstop1h 07m

Deal found 8/25

$249

Thu 9/105:36 pm -

Nonstop1h 18m

Mon 9/147:40 pm -

Nonstop1h 21m

Deal found 8/23

$264

Sat 10/31:05 pm -

Nonstop1h 15m

Sun 10/410:40 am -

Nonstop0h 56m

Deal found 8/26

$269

Fri 9/185:36 pm -

Nonstop1h 18m

Sun 9/2010:30 am -

Nonstop1h 07m

Deal found 8/26

$269

Thu 10/228:30 am -

Nonstop1h 13m

Sat 10/2410:40 am -

Nonstop1h 07m

Deal found 8/21

$314

Sat 11/1410:15 pm -

Nonstop1h 10m

Mon 11/167:40 pm -

Nonstop1h 13m

Deal found 8/23

$319

Last-minute flights from Dulles Intl to Philadelphia
Discover last-minute flight deals from Dulles Intl to Philadelphia. Data last updated August 26, 2026 and is based on user searches.

Tue 9/16:09 pm -

1 stop21h 47m

Wed 9/168:41 am -

1 stop8h 37m

Deal found 8/26

$228

Thu 9/107:50 am -

1 stop10h 24m

Wed 9/168:41 am -

1 stop8h 37m

Deal found 8/26

$201

Fri 9/1111:12 am -

1 stop7h 19m

Wed 9/1612:40 pm -

1 stop11h 30m

Deal found 8/26

$227

Sat 9/126:13 pm -

1 stop29h 29m

Wed 9/168:41 am -

1 stop8h 37m

Deal found 8/26

$217

Sun 9/139:04 pm -

1 stop10h 12m

Mon 9/145:32 pm -

1 stop6h 38m

Deal found 8/23

$202

Tue 9/159:04 pm -

1 stop10h 12m

Wed 9/165:32 pm -

1 stop6h 38m

Deal found 8/25

$180

Tue 9/229:04 pm -

1 stop10h 12m

Tue 9/2912:40 pm -

1 stop11h 30m

Deal found 8/25

$169

Wed 9/237:50 am -

1 stop10h 24m

Wed 9/308:41 am -

1 stop8h 37m

Deal found 8/26

$130

Fri 9/259:04 pm -

1 stop10h 12m

Mon 9/288:41 am -

1 stop8h 37m

Deal found 8/24

$195

Sun 9/277:50 am -

1 stop23h 26m

Fri 10/26:00 pm -

2 stops23h 18m

Deal found 8/23

$216

One-way flights from Dulles Intl to Philadelphia
Search for one-way flight options from Dulles Intl to Philadelphia. Find affordable one-way fares based on user searches. Data last updated August 26, 2026.

Fri 9/189:04 pm -

1 stop26h 14m

Deal found 8/26

$82

Tue 9/299:04 pm -

1 stop10h 12m

Deal found 8/22

$83

Tue 9/157:50 am -

1 stop15h 28m

Deal found 8/24

$84

Wed 9/167:50 am -

1 stop15h 28m

Deal found 8/24

$88

Thu 10/17:50 am -

1 stop23h 26m

Deal found 8/22

$98

Thu 9/1711:12 am -

2 stops12h 06m

Deal found 8/26

$110

Sun 9/277:50 am -

1 stop23h 26m

Deal found 8/22

$114

Sat 10/37:50 am -

2 stops24h 51m

Deal found 8/24

$117

Find flight deals from Dulles Intl to Philadelphia

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$130 (Kiwi.com)
One-way from	$82 (Kiwi.com)
Popular in	June
Cheapest in	November
Average price	$509
Good round-trip deal	$267 or less
Good one-way deal	$238 or less

Provider with most accurate pricing for Washington, D.C. Dulles Intl-Philadelphia flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Philadelphia flights.

Search Deals

From Washington, D.C. Dulles Intl to Philadelphia

Search Deals

One-way flight from Washington, D.C. Dulles Intl to Philadelphia

Search Deals

Highest demand for flights based on searches. 1% potential increase in price ($3 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease ($20 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in August 2026

Search Deals

Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Philadelphia.

Search Deals

Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Philadelphia.

Search Deals

Cheapflights Fare Finder

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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Philadelphia

IAD Washington, D.C. Dulles Intl - PHL Philadelphia

IADPHL

Washington, D.C. Dulles Intl

Fri 10/23

10:16 pm-11:30 pm

Nonstop1h 14m

Philadelphia

Sun 10/25

6:00 am-7:15 am

Nonstop1h 15m

$249

Washington, D.C.Philadelphia

IAD Washington, D.C. Dulles Intl - PHL Philadelphia

IADPHL

Washington, D.C. Dulles Intl

Fri 9/25

10:16 pm-11:30 pm

Nonstop1h 14m

Philadelphia

Mon 9/28

7:30 pm-8:49 pm

Nonstop1h 19m

$249

Washington, D.C.Philadelphia

IAD Washington, D.C. Dulles Intl - PHL Philadelphia

IADPHL

Washington, D.C. Dulles Intl

Thu 9/24

10:16 pm-11:30 pm

Nonstop1h 14m

Philadelphia

Sun 9/27

7:30 pm-8:49 pm

Nonstop1h 19m

$249

Washington, D.C.Philadelphia

IAD Washington, D.C. Dulles Intl - PHL Philadelphia

IADPHL

Washington, D.C. Dulles Intl

Wed 9/23

5:36 pm-6:54 pm

Nonstop1h 18m

Philadelphia

Wed 9/30

7:30 pm-8:49 pm

Nonstop1h 19m

$249

Washington, D.C.Philadelphia

IAD Washington, D.C. Dulles Intl - PHL Philadelphia

IADPHL

Washington, D.C. Dulles Intl

Tue 9/22

1:05 pm-2:20 pm

Nonstop1h 15m

Philadelphia

Tue 9/29

10:40 am-11:47 am

Nonstop1h 07m

$249

Washington, D.C.Philadelphia

IAD Washington, D.C. Dulles Intl - PHL Philadelphia

IADPHL

Washington, D.C. Dulles Intl

Thu 9/10

5:36 pm-6:54 pm

Nonstop1h 18m

Philadelphia

Mon 9/14

7:40 pm-9:01 pm

Nonstop1h 21m

$264

Quickest round-trip

Washington, D.C.Philadelphia

IAD Washington, D.C. Dulles Intl - PHL Philadelphia

IADPHL

Washington, D.C. Dulles Intl

Sat 10/3

1:05 pm-2:20 pm

Nonstop1h 15m

Philadelphia

Sun 10/4

10:40 am-11:36 am

Nonstop0h 56m

$269

Washington, D.C.Philadelphia

IAD Washington, D.C. Dulles Intl - PHL Philadelphia

IADPHL

Washington, D.C. Dulles Intl

Fri 9/18

5:36 pm-6:54 pm

Nonstop1h 18m

Philadelphia

Sun 9/20

10:30 am-11:37 am

Nonstop1h 07m

$269

Washington, D.C.Philadelphia

IAD Washington, D.C. Dulles Intl - PHL Philadelphia

IADPHL

Washington, D.C. Dulles Intl

Fri 10/23

9:06 pm-7:21 am

1 stop10h 15m

Philadelphia

Sun 10/25

6:03 pm-12:21 am

1 stop6h 18m

$277

Washington, D.C.Philadelphia

IAD Washington, D.C. Dulles Intl - PHL Philadelphia

IADPHL

Washington, D.C. Dulles Intl

Thu 10/22

8:30 am-9:43 am

Nonstop1h 13m

Philadelphia

Sat 10/24

10:40 am-11:47 am

Nonstop1h 07m

$314

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/25

Showing 1-10 of 21 resultsSorted by cheapest first

Compare providers for flights from Dulles Intl to Philadelphia

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Philadelphia in August.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust 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 Washington, D.C. Dulles Intl Airport-Philadelphia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-Philadelphia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Philadelphia flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Philadelphia 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 Washington, D.C. Dulles Intl Airport-Philadelphia 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 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.

IAD-PHL

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

Prices

Airlines

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

Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Philadelphia (average of $184). Flying from Washington, D.C. Dulles Intl Airport to Philadelphia in June is currently the most expensive (average of $610). 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?

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 afternoon tend to be the most expensive. A flight at noon could potentially save you up to 38% on airfare.

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

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

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

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to Philadelphia trip

Our travel experts

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.

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.

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

10,123 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.

United Airlines

7.4

Good

10,123 reviews

United Airlines

7.4

Good

10,123 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.

Related info for your journey

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 9 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 14m. United Airlines provides one of the quickest options available for as low as $249. The distance between Washington, D.C. Dulles Intl Airport and Philadelphia is about 134 mi. All flights are typically nonstop.
What is the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to Philadelphia round-trip?
United Airlines, at $189, was found to be the cheapest airline from Washington, D.C. Dulles Intl Airport to Philadelphia.. Users have found that United Airlines is 52% 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 ANA (85%), Mesa Airlines (78%) and Ethiopian Air (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 $133. On average you can expect to pay $424. The most popular route, (Washington, D.C. Dulles Intl - Philadelphia), can usually be booked for $249.
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, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Philadelphia (average of $184). Flying from Washington, D.C. Dulles Intl Airport to Philadelphia in June is currently the most expensive (average of $610). 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

Wildwood

Reading

King of Prussia

Camden

Wildwood Crest

Ocean City

Cherry Hill

Lewes

Plymouth Meeting

Wyomissing

Pottstown

Ephrata

Milford

Dover

Elkton

Essington

Willow Grove

New Castle

Millville

Vineland

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

Complete your trip

Flights by cabin class

Other flight options

Other flights from Dulles Intl

Philadelphia flight routes

Popular flights

Alternative routes for Dulles Intl to Philadelphia

Reagan-National to John F Kennedy Intl flights

Dulles Intl to John F Kennedy Intl flights

Dulles Intl to Newark flights

Reagan-National to LaGuardia flights

Reagan-National to Newark flights

Baltimore to LaGuardia flights

Dulles Intl to LaGuardia flights

Baltimore to John F Kennedy Intl flights

Baltimore to Newark flights

Dulles Intl to Pittsburgh flights

Baltimore to Pittsburgh flights

Reagan-National to Pittsburgh flights

Reagan-National to Philadelphia flights

Baltimore to Philadelphia flights

Dulles Intl to Erie flights

Dulles Intl to Scranton flights

Baltimore to Erie flights

Baltimore to Scranton flights

Baltimore to Morgantown flights

Reagan-National to Allentown flights

Baltimore to Harrisburg flights

Reagan-National to Scranton flights

Dulles Intl to Harrisburg flights

Baltimore to Allentown flights

Dulles Intl to Allentown flights

Baltimore to Elmira flights

Reagan-National to Harrisburg flights

Baltimore to Lancaster flights

Reagan-National to Elmira flights

Baltimore to Franklin flights

Baltimore to Hagerstown flights

Reagan-National to Williamsport flights

Baltimore to Altoona flights

Baltimore to Latrobe flights

Baltimore to Williamsport flights

Top airline flying from Dulles Intl to Philadelphia

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$189	Average$431	FlexibilityNo cancel fee	On-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.

$82+ 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 9/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Philadelphia with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Dulles Intl to Philadelphia

Cheapest flights from Dulles Intl to PhiladelphiaExplore 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 August 26, 2026.

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 August 26, 2026.

Best flights from Dulles Intl to PhiladelphiaDiscover carefully curated flight deals from Dulles Intl to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 26, 2026.

Discover carefully curated flight deals from Dulles Intl to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 26, 2026.

Last-minute flights from Dulles Intl to PhiladelphiaDiscover last-minute flight deals from Dulles Intl to Philadelphia. Data last updated August 26, 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to Philadelphia. Data last updated August 26, 2026 and is based on user searches.

One-way flights from Dulles Intl to PhiladelphiaSearch for one-way flight options from Dulles Intl to Philadelphia. Find affordable one-way fares based on user searches. Data last updated August 26, 2026.

Search for one-way flight options from Dulles Intl to Philadelphia. Find affordable one-way fares based on user searches. Data last updated August 26, 2026.

Find flight deals from Dulles Intl to Philadelphia

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Philadelphia that are best for you.

Compare providers for flights from Dulles Intl to Philadelphia

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 Dulles Intl to Philadelphia in August.

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.

Cheapflights Insights

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

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

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 afternoon tend to be the most expensive. A flight at noon could potentially save you up to 38% on airfare.

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

Weekly flight availability from Washington, D.C. Dulles Intl Airport to Philadelphia

The most flights from IAD to PHL are scheduled on a Monday (11 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (6 on average).

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

Our travel experts

Reviews of airlines servicing Philadelphia

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.

Related info for your journey

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

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

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

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

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

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

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

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

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

Traveling to a place near Philadelphia?

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.

Alternative routes for Dulles Intl to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Philadelphia by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Dulles Intl to Philadelphia by cabin class

Find flights from Dulles Intl to Philadelphia, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Dulles Intl and Philadelphia flights

Browse other Dulles Intl and Philadelphia flight options. Last updated on August 26, 2026.

Other flights from Dulles Intl

Browse through other flights departing from Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on August 26, 2026.

Other flights to Philadelphia

Explore flights to Philadelphia departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 26, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

Top airline flying from Dulles Intl to Philadelphia

100% Free

Book with Flexibility

Travel Smart

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 August 26, 2026.

Best flights from Dulles Intl to Philadelphia
Discover carefully curated flight deals from Dulles Intl to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 26, 2026.

Last-minute flights from Dulles Intl to Philadelphia
Discover last-minute flight deals from Dulles Intl to Philadelphia. Data last updated August 26, 2026 and is based on user searches.

One-way flights from Dulles Intl to Philadelphia
Search for one-way flight options from Dulles Intl to Philadelphia. Find affordable one-way fares based on user searches. Data last updated August 26, 2026.