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 $263 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 United Airlines, with whom users have recently found tickets for as low as $164. However, be on the lookout for offers from Frontier 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 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 $139. On average you can expect to pay $1,104. 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 Brussels Airlines (100%), Ethiopian Air (100%) or CommutAir (94%) 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 31% 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.

$155+ 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	$155 (Mytrip)
Popular in	February
Cheapest in	August
Average price	$323
Good round-trip deal	$555 or less
Good one-way deal	$273 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. 14% potential increase in price ($54 potential increase over avg. RT price).

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Cheapest flight prices on average. 5% potential price decrease ($15 potential savings vs. average RT price).

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Average for round-trip flights in June 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 June 5, 2025.

Fri 7/116:05 amPHL - IAD

Nonstop1h 10mUnited Airlines

Fri 7/1810:05 pmIAD - PHL

Nonstop1h 09mUnited Airlines

Deal found 6/4

$179

Fri 9/195:30 amPHL - IAD

1 stop10h 43mFrontier

Sun 9/213:00 pmIAD - PHL

1 stop9h 43mFrontier

Deal found 6/5

$263

Fri 6/136:42 pmPHL - IAD

1 stop5h 17mAmerican Airlines

Sun 6/156:55 amIAD - PHL

1 stop3h 43mAmerican Airlines

Deal found 6/5

$289

Thu 6/266:20 amPHL - IAD

2 stops27h 03mMultiple Airlines

Mon 6/304:54 pmIAD - PHL

2 stops29h 45mMultiple Airlines

Deal found 6/4

$315

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 June 5, 2025.

Fri 7/116:05 amPHL - IAD

Nonstop1h 10mUnited Airlines

Fri 7/1810:05 pmIAD - PHL

Nonstop1h 09mUnited Airlines

Deal found 6/4

$179

Fri 9/195:30 amPHL - IAD

1 stop10h 43mFrontier

Sun 9/213:00 pmIAD - PHL

1 stop9h 43mFrontier

Deal found 6/5

$263

Sat 7/126:35 pmPHL - IAD

1 stop5h 23mAmerican Airlines

Tue 7/158:06 pmIAD - PHL

1 stop4h 19mAmerican Airlines

Deal found 6/5

$289

Thu 6/266:20 amPHL - IAD

2 stops27h 03mMultiple Airlines

Mon 6/304:54 pmIAD - PHL

2 stops29h 45mMultiple Airlines

Deal found 6/4

$315

Last-minute flights from Philadelphia to Dulles Intl
Discover last-minute flight deals from Philadelphia to Dulles Intl. Data last updated June 5, 2025 and is based on user searches.

Thu 6/126:15 amPHL - IAD

Nonstop1h 10mUnited Airlines

Sun 6/158:29 amIAD - PHL

Nonstop1h 10mUnited Airlines

Deal found 6/4

$199

Thu 6/1211:49 amPHL - IAD

2 stops12h 15mFrontier

Sat 6/144:16 pmIAD - PHL

2 stops16h 50mFrontier

Deal found 6/4

$300

Thu 6/1212:19 pmPHL - IAD

3 stops26h 04mMultiple Airlines

Sun 6/1511:52 amIAD - PHL

2 stops19h 56mMultiple Airlines

Deal found 6/4

$489

Fri 6/136:42 pmPHL - IAD

1 stop5h 17mAmerican Airlines

Sun 6/156:55 amIAD - PHL

1 stop3h 43mAmerican Airlines

Deal found 6/5

$289

Thu 6/266:20 amPHL - IAD

2 stops27h 03mMultiple Airlines

Mon 6/304:54 pmIAD - PHL

2 stops29h 45mMultiple Airlines

Deal found 6/4

$315

Wed 7/26:54 pmPHL - IAD

1 stop5h 10mFrontier

Wed 7/96:10 amIAD - PHL

1 stop11h 45mFrontier

Deal found 6/4

$276

Fri 7/116:05 amPHL - IAD

Nonstop1h 10mUnited Airlines

Fri 7/1810:05 pmIAD - PHL

Nonstop1h 09mUnited Airlines

Deal found 6/4

$179

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 June 5, 2025.

Fri 7/47:05 amPHL - IAD

2 stops37h 48mMultiple Airlines

Deal found 6/5

$155

Tue 7/17:59 pmPHL - IAD

Nonstop1h 09mUnited Airlines

Deal found 6/3

$164

Thu 6/1210:29 pmPHL - IAD

1 stop14h 15mFrontier

Deal found 6/5

$171

Thu 8/711:12 amPHL - IAD

1 stop25h 19mSun Country Air

Deal found 6/3

$192

Tue 7/16:42 pmPHL - IAD

1 stop5h 17mAmerican Airlines

Deal found 6/3

$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

Fri 7/11

6:05 am-7:15 am

Nonstop1h 10m

Washington, D.C. Dulles Intl

Fri 7/18

10:05 pm-11:14 pm

Nonstop1h 09m

$179

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 9/19

5:30 am-4:13 pm

1 stop10h 43m

Washington, D.C. Dulles Intl

Sun 9/21

3:00 pm-12:43 am

1 stop9h 43m

$263

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Sat 7/12

6:35 pm-11:58 pm

1 stop5h 23m

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 6/26

6:20 am-9:23 am

2 stops27h 03m

Washington, D.C. Dulles Intl

Mon 6/30

4:54 pm-10:39 pm

2 stops29h 45m

$315

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Fri 7/4

7:05 am-8:53 pm

2 stops37h 48m

$155

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Tue 7/1

7:59 pm-9:08 pm

Nonstop1h 09m

$164

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Thu 6/12

10:29 pm-12:44 pm

1 stop14h 15m

$171

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Thu 8/7

11:12 am-12:31 pm

1 stop25h 19m

$192

PhiladelphiaWashington, D.C.

PHL - IAD

PHLIAD

Philadelphia

Tue 7/1

6:42 pm-11:59 pm

1 stop5h 17m

$214

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/5

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 June is currently the most expensive (average of $352). 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 36% 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 Thursday evenings 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

The most flights from PHL to IAD are scheduled on a Wednesday (11 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

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

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

Read reviews from past customers who have flown United Airlines, American Airlines and Sun Country Air from Philadelphia to Washington, D.C.. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

8,774 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

8,774 reviews

United Airlines

7.4

Good

8,774 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

8,774 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!

Sun Country Air

6.9

Okay

345 reviews

United Airlines

7.4

Good

8,774 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

6.0

Okay

3,291 reviews

United Airlines

7.4

Good

8,774 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 $263 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 United Airlines, with whom users have recently found tickets for as low as $164. However, be on the lookout for offers from Frontier 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 Brussels Airlines (100%), Ethiopian Air (100%) or CommutAir (94%) 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 $139. On average you can expect to pay $1,104. 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 June is currently the most expensive (average of $352). 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.

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Top airline flying from Philadelphia to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$159	Average$265	FlexibilityNo cancel fee	On-time69%

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$155+ 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 7/4. 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

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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 June 5, 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 June 5, 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 June 5, 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 1, 2025.

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

Rainfall in Dulles Intl by month

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

Temperature in Dulles Intl by month

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

Reviews of airlines servicing Dulles Intl

Read reviews from past customers who have flown United Airlines, American Airlines and Sun Country Air from Philadelphia to Washington, D.C.. Users have also rated airlines in terms of 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 June 5, 2025.