$135 Cheap Flights from Washington (IAD) to Philadelphia (PHL)

View $135 flight on Thu, Dec 18, 2025Opens in a new window

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

Cheap Flights from Washington to Philadelphia (IAD-PHL)

Prices were available within the past 7 days and start at $135 for one-way flights and $179 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Dec 10 - Mon, Dec 15
IAD
Washington
PHL
Philadelphia
$179 Roundtrip, found 4 hours ago
$179
Roundtrip
found 4 hours ago
Select United flight, departing Wed, Dec 10 from Washington to Philadelphia, returning Mon, Dec 15, priced at $179 found 4 hours ago
United
Fri, Nov 28 - Mon, Dec 1
IAD
Washington
PHL
Philadelphia
$192 Roundtrip, found 2 days ago
$192
Roundtrip
found 2 days ago
Select United flight, departing Fri, Nov 28 from Washington to Philadelphia, returning Mon, Dec 1, priced at $192 found 2 days ago
United
Sat, Nov 15 - Sat, Nov 22
IAD
Washington
PHL
Philadelphia
$194 Roundtrip, found 4 hours ago
$194
Roundtrip
found 4 hours ago
Select United flight, departing Sat, Nov 15 from Washington to Philadelphia, returning Sat, Nov 22, priced at $194 found 4 hours ago
United
Thu, Jan 1 - Fri, Jan 2
IAD
Washington
PHL
Philadelphia
$197 Roundtrip, found 3 days ago
$197
Roundtrip
found 3 days ago
Select United flight, departing Thu, Jan 1 from Washington to Philadelphia, returning Fri, Jan 2, priced at $197 found 3 days ago
United
Mon, Nov 10 - Mon, Nov 17
IAD
Washington
PHL
Philadelphia
$199 Roundtrip, found 4 days ago
$199
Roundtrip
found 4 days ago
Select United flight, departing Mon, Nov 10 from Washington to Philadelphia, returning Mon, Nov 17, priced at $199 found 4 days ago
United
Mon, Dec 22 - Mon, Dec 29
IAD
Washington
PHL
Philadelphia
$202 Roundtrip, found 2 days ago
$202
Roundtrip
found 2 days ago
Select United flight, departing Mon, Dec 22 from Washington to Philadelphia, returning Mon, Dec 29, priced at $202 found 2 days ago
United
Sat, Jan 24 - Wed, Jan 28
IAD
Washington
PHL
Philadelphia
$203 Roundtrip, found 2 days ago
$203
Roundtrip
found 2 days ago
Select United flight, departing Sat, Jan 24 from Washington to Philadelphia, returning Wed, Jan 28, priced at $203 found 2 days ago
United
Wed, Nov 26 - Sat, Nov 29
IAD
Washington
PHL
Philadelphia
$215 Roundtrip, found 4 hours ago
$215
Roundtrip
found 4 hours ago
Select United flight, departing Wed, Nov 26 from Washington to Philadelphia, returning Sat, Nov 29, priced at $215 found 4 hours ago
American Airlines
Wed, Nov 19 - Sat, Nov 22
IAD
Washington
PHL
Philadelphia
$259 Roundtrip, found 1 hour ago
$259
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Wed, Nov 19 from Washington to Philadelphia, returning Sat, Nov 22, priced at $259 found 1 hour ago
Delta
Tue, Jan 27 - Sat, Jan 31
IAD
Washington
PHL
Philadelphia
$383 Roundtrip, found 3 days ago
$383
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Jan 27 from Washington to Philadelphia, returning Sat, Jan 31, priced at $383 found 3 days ago

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

June is typically the cheapest month to fly

From $160 - $479 per traveler.

Alternative airports near Philadelphia

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

Select flight to Philadelphia Intl. PHL. Cheapest and Closest option available. Average driving time to city center is 17 minutes. Flights from $194
PHL
Philadelphia Intl.
CheapestClosest
Average driving time to city center17 min
Flights from $194
Flights from Washington (IAD) to Philadelphia (PHL)
Origin airport
Washington Dulles Intl.
Destination airport
Philadelphia Intl.
Airlines serving
American Airlines, Delta, United
Roundtrip price
$173
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 December. 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 $135 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?
Secure a cheap one-way flight from $135 or cheap return flight from $179 from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL)?
Planning your trip for December is a good way to save, as it's the cheapest month for flights between IAD and PHL. You'll typically find the lowest fares during the off-season.
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 Washington Dulles Intl. Airport (IAD) to Philadelphia Intl. Airport (PHL)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest IAD to PHL flight.
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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*Available to One Key members.