What are the cheapest airlines flying 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 $179. Additional round-trip tickets that might be worth considering are offered by Frontier and American Airlines, with the lowest prices starting at $201 and $289, respectively. United Airlines is currently priced 43% below the average price you’ll pay for this route.

What are the cheapest airlines to fly from Philadelphia to Washington, D.C. Dulles Intl Airport one-way?

The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $120. However, be on the lookout for offers from United Airlines and American Airlines, as they are both options that can get you from Philadelphia to Washington, D.C. Dulles Intl Airport for a low price.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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 $198. On average you can expect to pay $1,392. The most popular route, (Philadelphia - Washington, D.C. Dulles Intl), can usually be booked for $179.

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

Consider ANA (82%), Air Canada (82%) or Avianca (70%) when booking your flight. These represent the most reliable airlines when flying from Philadelphia to Washington, D.C. Dulles Intl Airport.

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

Users have found that leaving on a Tuesday can be a cost-effective option. It’s possible to save up to 32% on your flight compared to booking on days when demand is much higher.

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

Flights from Philadelphia to Washington, D.C. Dulles Intl Airport lean towards being more expensive in December. Prices are generally better when you fly from Philadelphia to Washington, D.C. Dulles Intl Airport in November, with the cheapest ticket starting at $179.

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 9 flights from Philadelphia to Washington, D.C. Dulles Intl per day from 1 airline.

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.

$120+ Flights from Philadelphia to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Philadelphia to Dulles Intl

Round-trip from	$179 (United Airlines)
One-way from	$120 (Orbitz)
Popular in	February
Cheapest in	July
Average price	$239
Good round-trip deal	$583 or less
Good one-way deal	$290 or less

From Philadelphia to Washington, D.C. Dulles Intl

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

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Highest demand for flights based on searches. 13% potential increase in price ($49 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($15 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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

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

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Find 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 3, 2025.

Thu 7/3110:40 amPHL - IAD

Nonstop1h 00mUnited Airlines

Mon 8/1110:05 pmIAD - PHL

Nonstop1h 09mUnited Airlines

Deal found 7/2

$179

Thu 7/2410:29 pmPHL - IAD

1 stop14h 13mFrontier

Sun 7/277:46 pmIAD - PHL

1 stop15h 48mFrontier

Deal found 6/30

$201

Wed 8/277:09 pmPHL - IAD

2 stops15h 35mMultiple Airlines

Sat 8/308:12 pmIAD - PHL

2 stops16h 49mMultiple Airlines

Deal found 7/3

$259

Sat 7/126:08 amPHL - IAD

1 stop4h 29mAmerican Airlines

Tue 7/156:35 amIAD - PHL

1 stop4h 02mAmerican Airlines

Deal found 7/2

$289

Best flights from Philadelphia to Dulles Intl
Discover carefully curated flight deals from Philadelphia to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 3, 2025.

Thu 7/3110:40 amPHL - IAD

Nonstop1h 00mUnited Airlines

Mon 8/1110:05 pmIAD - PHL

Nonstop1h 09mUnited Airlines

Deal found 7/2

$179

Thu 7/2410:29 pmPHL - IAD

1 stop14h 13mFrontier

Sun 7/277:46 pmIAD - PHL

1 stop15h 48mFrontier

Deal found 6/30

$201

Wed 8/277:09 pmPHL - IAD

2 stops15h 35mMultiple Airlines

Sat 8/308:12 pmIAD - PHL

2 stops16h 49mMultiple Airlines

Deal found 7/3

$259

Wed 7/303:35 pmPHL - IAD

1 stop4h 01mAmerican Airlines

Wed 8/67:25 pmIAD - PHL

1 stop3h 59mAmerican Airlines

Deal found 7/2

$289

Last-minute flights from Philadelphia to Dulles Intl
Discover last-minute flight deals from Philadelphia to Dulles Intl. Data last updated July 3, 2025 and is based on user searches.

Fri 7/116:45 pmPHL - IAD

1 stop5h 27mFrontier

Mon 7/144:24 pmIAD - PHL

1 stop8h 11mFrontier

Deal found 7/1

$300

Fri 7/116:05 amPHL - IAD

Nonstop1h 10mUnited Airlines

Mon 7/1410:05 pmIAD - PHL

Nonstop1h 09mUnited Airlines

Deal found 7/1

$343

Sat 7/126:08 amPHL - IAD

1 stop4h 29mAmerican Airlines

Tue 7/156:35 amIAD - PHL

1 stop4h 02mAmerican Airlines

Deal found 7/2

$289

Thu 7/2410:29 pmPHL - IAD

1 stop14h 13mFrontier

Sun 7/277:46 pmIAD - PHL

1 stop15h 48mFrontier

Deal found 6/30

$201

Thu 7/3110:40 amPHL - IAD

Nonstop1h 00mUnited Airlines

Mon 8/1110:05 pmIAD - PHL

Nonstop1h 09mUnited Airlines

Deal found 7/2

$179

Wed 8/277:09 pmPHL - IAD

2 stops15h 35mMultiple Airlines

Sat 8/308:12 pmIAD - PHL

2 stops16h 49mMultiple Airlines

Deal found 7/3

$259

One-way flights from Philadelphia to Dulles Intl
Search for one-way flight options from Philadelphia to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated July 3, 2025.

Thu 7/316:45 pmPHL - IAD

1 stop5h 27mFrontier

Deal found 7/1

$120

Sat 8/95:21 pmPHL - IAD

2 stops17h 47mMultiple Airlines

Deal found 7/2

$122

Fri 8/87:59 pmPHL - IAD

Nonstop1h 09mUnited Airlines

Deal found 7/3

$204

Fri 8/155:53 pmPHL - IAD

1 stop5h 03mAmerican Airlines

Deal found 7/1

$214

Cheapflights Fare Finder

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

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Thu 7/31

7:59 pm-9:08 pm

Nonstop1h 09m

Washington, D.C. Dulles Intl

Thu 8/7

10:05 pm-11:14 pm

Nonstop1h 09m

$179

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Thu 7/24

10:29 pm-12:42 pm

1 stop14h 13m

Washington, D.C. Dulles Intl

Sun 7/27

7:46 pm-11:34 am

1 stop15h 48m

$201

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Wed 8/27

7:09 pm-10:44 am

2 stops15h 35m

Washington, D.C. Dulles Intl

Sat 8/30

8:12 pm-1:01 pm

2 stops16h 49m

$259

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Sat 7/12

6:08 am-10:37 am

1 stop4h 29m

Washington, D.C. Dulles Intl

Tue 7/15

8:06 pm-12:25 am

1 stop4h 19m

$289

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Thu 7/31

6:45 pm-12:12 am

1 stop5h 27m

$120

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Sat 8/9

5:21 pm-11:08 am

2 stops17h 47m

$122

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 8/8

7:59 pm-9:08 pm

Nonstop1h 09m

$204

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 8/15

5:53 pm-10:56 pm

1 stop5h 03m

$214

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

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

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

Airports

PHL

For efficient check-in, verify your airline’s terminal before arriving at PHL. Terminals are spread out, and only some are linked by indoor walkways.

IAD

The Silver Line Metro reaches IAD in under 40 minutes, offering a cheap and convenient way to get to Washington, D.C.

Our travel experts

Mark Chesnut

Expert on PHL

Ramsey Qubein

Expert on IAD

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, August is the cheapest month in which you can book a flight from Philadelphia to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Philadelphia to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $345). 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?

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 34% on airfare.

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

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. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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

The most flights from PHL to IAD are scheduled on a Monday (11 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 on average).

Reviews of airlines servicing Dulles Intl

Read through reviews of airlines operating flights from Philadelphia to Washington, D.C. Dulles Intl Airport, such as United Airlines, American Airlines, and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

8,861 reviews

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

8,861 reviews

United Airlines

7.4

Good

8,861 reviews

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!

American Airlines

7.2

Good

10,000 reviews

United Airlines

7.4

Good

8,861 reviews

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!

Frontier

5.9

Fair

3,286 reviews

United Airlines

7.4

Good

8,861 reviews

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

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 9 flights from Philadelphia to Washington, D.C. Dulles Intl per day from 1 airline.
What are the cheapest airlines flying 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 $179. Additional round-trip tickets that might be worth considering are offered by Frontier and American Airlines, with the lowest prices starting at $201 and $289, respectively. United Airlines is currently priced 43% below the average price you’ll pay for this route.
What are the cheapest airlines to fly from Philadelphia to Washington, D.C. Dulles Intl Airport one-way?
The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $120. However, be on the lookout for offers from United Airlines and American Airlines, as they are both options that can get you from Philadelphia to Washington, D.C. Dulles Intl Airport for a low price.
What are the most reliable airlines from Philadelphia to Washington, D.C. Dulles Intl Airport?
Consider ANA (82%), Air Canada (82%) or Avianca (70%) 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 $198. On average you can expect to pay $1,392. The most popular route, (Philadelphia - Washington, D.C. Dulles Intl), can usually be booked for $179.
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, August is the cheapest month in which you can book a flight from Philadelphia to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Philadelphia to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $345). 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

Arlington

Woodbridge

Alexandria

Tysons

Silver Spring

Fredericksburg

Linthicum Heights

Gaithersburg

Fairfax

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Towson

Waldorf

Laurel

Falls Church

Rockville

Springfield

National Harbor

Manassas

Dundalk

Bowie

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Philadelphia to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$189	Average$270	FlexibilityNo cancel fee	On-time69%

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$120+ 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 7/31. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Philadelphia to Dulles Intl with Cheapflights

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Cheap flight deals from Philadelphia to Dulles Intl

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Philadelphia to Dulles Intl

Cheapest flights from Philadelphia to Dulles IntlExplore 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 3, 2025.

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 3, 2025.

Cheapflights Fare Finder

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

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

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

Airports

PHL

IAD

Our travel experts

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.

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?

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 3, 2025.

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 June 29, 2025.

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

Reviews of airlines servicing Dulles Intl

Read through reviews of airlines operating flights from Philadelphia to Washington, D.C. Dulles Intl Airport, such as United Airlines, American Airlines, and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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?

What are the cheapest airlines flying from Philadelphia to Washington, D.C. Dulles Intl Airport round-trip?

What are the cheapest airlines to fly from Philadelphia to Washington, D.C. Dulles Intl Airport one-way?

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

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

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

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

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

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

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Top airline flying from Philadelphia to Dulles Intl

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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 3, 2025.