$168 Cheap Flights from Washington (IAD) to Philadelphia (PHL)

View $168 flight on Tue, Aug 19, 2025Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL)

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Cheap Flights from Washington to Philadelphia (IAD-PHL)

Prices were available within the past 7 days and start at $168 for one-way flights and $179 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Oct 30 - Sun, Nov 2
IAD
Washington
PHL
Philadelphia
$179 Roundtrip, found 3 hours ago
$179
Roundtrip
found 3 hours ago
Select United flight, departing Thu, Oct 30 from Washington to Philadelphia, returning Sun, Nov 2, priced at $179 found 3 hours ago
United
Sat, Oct 11 - Tue, Oct 14
IAD
Washington
PHL
Philadelphia
$182 Roundtrip, found 1 day ago
$182
Roundtrip
found 1 day ago
Select United flight, departing Sat, Oct 11 from Washington to Philadelphia, returning Tue, Oct 14, priced at $182 found 1 day ago
United
Wed, Aug 20 - Sun, Aug 24
IAD
Washington
PHL
Philadelphia
$183 Roundtrip, found 6 days ago
$183
Roundtrip
found 6 days ago
Select United flight, departing Wed, Aug 20 from Washington to Philadelphia, returning Sun, Aug 24, priced at $183 found 6 days ago
United
Wed, Aug 13 - Wed, Aug 20
IAD
Washington
PHL
Philadelphia
$184 Roundtrip, found 9 hours ago
$184
Roundtrip
found 9 hours ago
Select United flight, departing Wed, Aug 13 from Washington to Philadelphia, returning Wed, Aug 20, priced at $184 found 9 hours ago
United
Thu, Oct 30 - Sun, Nov 2
IAD
Washington
PHL
Philadelphia
$189 Roundtrip, found 3 hours ago
$189
Roundtrip
found 3 hours ago
Select United flight, departing Thu, Oct 30 from Washington to Philadelphia, returning Sun, Nov 2, priced at $189 found 3 hours ago
United
Thu, Aug 14 - Sun, Aug 17
IAD
Washington
PHL
Philadelphia
$194 Roundtrip, found 15 hours ago
$194
Roundtrip
found 15 hours ago
Select United flight, departing Thu, Aug 14 from Washington to Philadelphia, returning Sun, Aug 17, priced at $194 found 15 hours ago
United
Fri, Aug 8 - Sat, Aug 9
IAD
Washington
PHL
Philadelphia
$199 Roundtrip, found 9 hours ago
$199
Roundtrip
found 9 hours ago
Select United flight, departing Fri, Aug 8 from Washington to Philadelphia, returning Sat, Aug 9, priced at $199 found 9 hours ago
United
Mon, Aug 11 - Mon, Aug 18
IAD
Washington
PHL
Philadelphia
$211 Roundtrip, found 2 days ago
$211
Roundtrip
found 2 days ago
Select United flight, departing Mon, Aug 11 from Washington to Philadelphia, returning Mon, Aug 18, priced at $211 found 2 days ago
American Airlines
Tue, Oct 14 - Thu, Oct 23
IAD
Washington
PHL
Philadelphia
$289 Roundtrip, found 4 hours ago
$289
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Tue, Oct 14 from Washington to Philadelphia, returning Thu, Oct 23, priced at $289 found 4 hours ago
Delta
Tue, Aug 19 - Wed, Aug 20
IAD
Washington
PHL
Philadelphia
$325 Roundtrip, found 5 days ago
$325
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Aug 19 from Washington to Philadelphia, returning Wed, Aug 20, priced at $325 found 5 days ago

Find the cheapest month to fly from Washington (IAD) to Philadelphia (PHL)

June is typically the cheapest month to fly

From $160 - $500 per traveler.

Graph displaying average flight prices per month

Alternative airports near Philadelphia

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to New Castle ILG. Average driving time to city center is 44 minutes. Flights from $363
ILG
New Castle
Average driving time to city center44 min
Flights from $363
Flights from Washington (IAD) to Philadelphia (PHL)
Origin airport
Washington Dulles Intl.
Destination airport
Philadelphia Intl.
Airlines serving
American Airlines, Delta, United
Roundtrip price
$179
Distance
133 mi
Average flight time
1 hour 12 mins

Washington to Philadelphia Flights

The cheapest times to fly from Washington to Philadelphia

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Philadelphia are during the month of October. You can find some of the cheapest flights from Washington to Philadelphia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Philadelphia

Sunday is one of the best days to book for cheap flights from Washington to Philadelphia: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to Philadelphia

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Philadelphia in 2025. You can also book with separate airlines for your outbound and return journeys, from $168 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Philadelphia flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to Philadelphia airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL) cost?
You'll find affordable return tickets from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL) starting from $179. Grab a seat and take off on your trip. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a United flight leaving IAD on August 19 2025 and touching down at PHL. The price was last updated on July 23 2025 and has not changed since.
What is the cheapest month to fly from IAD to PHL?
The cheapest flights from IAD to PHL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL)?
Board a nonstop flight with United Airlines and go straight from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL).
What is the cheapest airline that flies from IAD to PHL?
With prices as low as $204 for a one-way flight from IAD to PHL, United is currently the cheapest airline for this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from IAD on August 25 2025. Prices were last updated on July 23 2025 and have not changed since.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL)?
With, on average, 2 direct flights that operate from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL) each day, you'll be up in the air in no time.
What are the most popular departure times for flights from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL)?
More travelers fly between IAD and PHL at 5 PM than at any other time of day. Looking to skip the crowds? Pick a flight outside the busiest times and it's possible you'll save on your fare as well.
What day of the week has the most flights from IAD to PHL?
Friday offers the most flights from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL). Consider traveling on this day and you'll have the best chance of finding a departure that works with your plans.
What is the earliest flight from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL)?
The earliest flight out of Washington Dulles Intl. Airport (IAD) is at around 8:30AM UTC-5. Board this plane and you'll land at Philadelphia Intl. Airport (PHL) at approximately 9:41AM UTC-5. The entire trip takes 1h 11m.
How long does it take to fly from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL)?
The average flight time from IAD to PHL is 1 hour and 11 minutes, covering a total distance of 130 mi.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL)?
To reach Philadelphia Intl. Airport (PHL) on schedule, book a flight that leaves Washington Dulles Intl. Airport (IAD) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Philadelphia from Washington Dulles Intl. Airport (IAD)?
Compare your flight options from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL). This is the only Philadelphia airport you can arrive at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL) last-minute?
Last-minute bookings from IAD to PHL are typically more expensive. To secure the lowest rates, start looking for flights well in advance. That being said, if you're flexible with your travel dates, it's possible to find a cheap ticket right before your journey.
Is it cheaper to book an IAD to PHL flight and hotel package?
You can save money by securing an IAD to PHL flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one convenient place. Once you've selected your ideal flights and accommodations, you can add extras such as activities, car rentals and tours.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL)?
It's usually possible to reschedule or cancel your IAD to PHL flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find further details on our Customer Service portal.

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