Dulles Intl

$148+ 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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — IAD
Jun 23 — Jun 301
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Cheap 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 June 18, 2025.

Round-trip from

$184
(United Airlines)

One-way from

$148
(Mytrip)

Popular in

February

Cheapest in

November

Average price

$246

Good round-trip deal

$539 or less

Good one-way deal

$334 or less
From Philadelphia to Washington, D.C. Dulles Intl
One-way flight from Philadelphia to Washington, D.C. Dulles Intl
Highest demand for flights based on searches. 13% potential increase in price ($48 potential increase over avg. RT price).
Cheapest flight prices on average. 4% potential price decrease ($15 potential savings vs. average RT price).
Average for round-trip flights in June 2025
Price to beat on a round-trip flight from Philadelphia to Washington, D.C. Dulles Intl.
Price to beat on a one-way flight from Philadelphia to Washington, D.C. Dulles Intl.

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 June 18, 2025.

This United Airlines deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/26:05 amPHL - IAD
Nonstop1h 10mUnited Airlines
Sun 7/2710:05 pmIAD - PHL
Nonstop1h 09mUnited Airlines
Deal found 6/18$184
This Mytrip deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/25:21 pmPHL - IAD
2 stops17h 47mMultiple Airlines
Sat 8/99:20 pmIAD - PHL
2 stops18h 56mMultiple Airlines
Deal found 6/18$273
This American Airlines deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/23:35 pmPHL - IAD
1 stop4h 09mAmerican Airlines
Sun 7/276:35 amIAD - PHL
1 stop4h 02mAmerican Airlines
Deal found 6/18$289
This Vliegwinkel deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/108:16 amPHL - IAD
1 stop4h 33mAlaska Airlines
Sun 7/136:35 amIAD - PHL
1 stop4h 02mAlaska Airlines
Deal found 6/16$339
This KAYAK deal was found by Cheapflights users on 6/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/236:00 amPHL - IAD
1 stop5h 33mDelta
Mon 6/235:24 pmIAD - PHL
1 stop5h 46mDelta
Deal found 6/17$1,143

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 June 18, 2025.
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

Philadelphia

Fly to

Dulles Intl

Route

Depart

Return

Price

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Wed 7/2

6:05 am-7:15 am

Nonstop1h 10m

Washington, D.C. Dulles Intl

Sun 7/27

10:05 pm-11:14 pm

Nonstop1h 09m

$184

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Sat 8/2

5:21 pm-11:08 am

2 stops17h 47m

Washington, D.C. Dulles Intl

Sat 8/9

9:20 pm-4:16 pm

2 stops18h 56m

$273

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Wed 7/2

3:35 pm-7:44 pm

1 stop4h 09m

Washington, D.C. Dulles Intl

Sun 7/27

6:35 am-10:37 am

1 stop4h 02m

$289

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Thu 7/10

8:16 am-12:49 pm

1 stop4h 33m

Washington, D.C. Dulles Intl

Sun 7/13

6:35 am-10:37 am

1 stop4h 02m

$339

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Mon 6/23

6:00 am-11:33 am

1 stop5h 33m

Washington, D.C. Dulles Intl

Mon 6/23

5:24 pm-11:10 pm

1 stop5h 46m

$1,143

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Wed 7/9

6:13 am-11:08 am

2 stops28h 55m

$148

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Mon 9/1

7:58 pm-9:05 pm

Nonstop1h 07m

$204

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Tue 7/8

6:08 am-12:36 pm

1 stop6h 28m

$213

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Sun 6/22

12:18 pm-12:19 pm

1 stop24h 01m

$522

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Sat 7/12

4:02 pm-8:40 am

2 stops40h 38m

$1,746

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/16

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

Read more about PHLby Mark Chesnut
IAD

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

Read more about IADby Ramsey Qubein
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 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 $347). 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 June 18, 2025.

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 37% 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 June 15, 2025.

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. Friday 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

Explore weekly flight availability from Philadelphia to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 18, 2025.

The most flights from PHL to IAD are scheduled on a Monday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

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.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

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).

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 June 18, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta and Qatar Airways from Philadelphia to Washington, D.C.. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
8.0
Very good

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airport do you fly from for flights from Philadelphia to Washington, D.C. Dulles Intl?

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

  • 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 $184. Additional round-trip tickets that might be worth considering are offered by American Airlines and Alaska Airlines, with the lowest prices starting at $289 and $339, respectively. United Airlines is currently priced 42% 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 United Airlines, with whom users have recently found tickets for as low as $204. However, be on the lookout for offers from American Airlines and Sun Country Air, 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 CommutAir (90%), ANA (89%) or Ethiopian Air (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 $169. On average you can expect to pay $1,169. The most popular route, (Philadelphia - Washington, D.C. Dulles Intl), can usually be booked for $189.

  • 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 $347). 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
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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 June 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$159Average$266FlexibilityNo cancel feeOn-time69%

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