$124 Cheap Flights from Philadelphia (PHL) to Washington (IAD)

View $124 flight on Wed, Nov 26, 2025Opens in a new window

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

Cheap Flights from Philadelphia to Washington (PHL-IAD)

Prices were available within the past 7 days and start at $124 for one-way flights and $179 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Fri, Nov 21 - Sun, Nov 23
PHL
Philadelphia
IAD
Washington
$179 Roundtrip, found 11 hours ago
$179
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Nov 21 from Philadelphia to Washington, returning Sun, Nov 23, priced at $179 found 11 hours ago
United
Mon, Nov 10 - Mon, Nov 17
PHL
Philadelphia
IAD
Washington
$184 Roundtrip, found 4 days ago
$184
Roundtrip
found 4 days ago
Select United flight, departing Mon, Nov 10 from Philadelphia to Washington, returning Mon, Nov 17, priced at $184 found 4 days ago
United
Wed, Dec 17 - Wed, Dec 31
PHL
Philadelphia
IAD
Washington
$192 Roundtrip, found 2 days ago
$192
Roundtrip
found 2 days ago
Select United flight, departing Wed, Dec 17 from Philadelphia to Washington, returning Wed, Dec 31, priced at $192 found 2 days ago
United
Fri, Nov 14 - Fri, Nov 21
PHL
Philadelphia
IAD
Washington
$194 Roundtrip, found 15 hours ago
$194
Roundtrip
found 15 hours ago
Select United flight, departing Fri, Nov 14 from Philadelphia to Washington, returning Fri, Nov 21, priced at $194 found 15 hours ago
United
Mon, Nov 10 - Mon, Nov 17
PHL
Philadelphia
IAD
Washington
$197 Roundtrip, found 4 days ago
$197
Roundtrip
found 4 days ago
Select United flight, departing Mon, Nov 10 from Philadelphia to Washington, returning Mon, Nov 17, priced at $197 found 4 days ago
United
Mon, Mar 9 - Wed, Mar 18
PHL
Philadelphia
IAD
Washington
$199 Roundtrip, found 1 day ago
$199
Roundtrip
found 1 day ago
Select United flight, departing Mon, Mar 9 from Philadelphia to Washington, returning Wed, Mar 18, priced at $199 found 1 day ago
United
Fri, Dec 26 - Sat, Dec 27
PHL
Philadelphia
IAD
Washington
$200 Roundtrip, found 19 hours ago
$200
Roundtrip
found 19 hours ago
Select United flight, departing Fri, Dec 26 from Philadelphia to Washington, returning Sat, Dec 27, priced at $200 found 19 hours ago
United
Wed, Dec 3 - Mon, Dec 8
PHL
Philadelphia
IAD
Washington
$202 Roundtrip, found 2 days ago
$202
Roundtrip
found 2 days ago
Select United flight, departing Wed, Dec 3 from Philadelphia to Washington, returning Mon, Dec 8, priced at $202 found 2 days ago
American Airlines
Sat, Jan 17 - Tue, Jan 20
PHL
Philadelphia
IAD
Washington
$259 Roundtrip, found 2 hours ago
$259
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Sat, Jan 17 from Philadelphia to Washington, returning Tue, Jan 20, priced at $259 found 2 hours ago
Delta
Sat, Dec 6 - Mon, Dec 8
PHL
Philadelphia
IAD
Washington
$399 Roundtrip, found 4 days ago
$399
Roundtrip
found 4 days ago
Select Delta flight, departing Sat, Dec 6 from Philadelphia to Washington, returning Mon, Dec 8, priced at $399 found 4 days ago

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

September is typically the cheapest month to fly

From $153 - $592 per traveler.

Alternative airports near Washington

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

Select flight to Ronald Reagan Washington National DCA. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $234
DCA
Ronald Reagan Washington National
CheapestClosest
Average driving time to city center8 min
Flights from $234
Flights from Philadelphia (PHL) to Washington (IAD)
Origin airport
Philadelphia Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
American Airlines, Delta, United
Roundtrip price
$179
Distance
133 mi
Average flight time
1 hour 6 mins

Philadelphia to Washington Flights

The cheapest times to fly from Philadelphia to Washington

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 Philadelphia to Washington are during the month of November. You can find some of the cheapest flights from Philadelphia to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Philadelphia to Washington

Sunday is one of the best days to book for cheap flights from Philadelphia to Washington: 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 Philadelphia to Washington

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 Philadelphia to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $124 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 Philadelphia to Washington 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 Philadelphia to Washington 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 Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD) cost?
Secure a cheap one-way flight from $124 or cheap return flight from $179 from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD)?
November is the cheapest month to fly from PHL to IAD. Planning your trip for the off-season is often the key to finding better fares.
Which airlines fly direct from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD)?
You can fly directly from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD) on a United Airlines flight.
What is the cheapest airline that flies from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD)?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from PHL to IAD. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.
How many flights per day from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD)?
Each day on average, 2 direct flights take off from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD). Pick the departure time that fits your schedule best.
What are the most popular departure times for flights from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD)?
Flights between PHL and IAD are their busiest at 6 AM. If you'd like a more relaxed trip and possibly cheaper tickets, choose a departure outside the usual busy windows.
What day of the week has the most flights from PHL to IAD?
Friday offers the most flights from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD). Consider taking off 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 Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD)?
The first flight of the day leaving from Philadelphia Intl. Airport (PHL) is at around 6:15AM UTC-5. Board this plane and you'll touch down at Washington Dulles Intl. Airport (IAD) at approximately 7:30AM UTC-5. The total flight duration is 1h 15m.
How long does it take to fly from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD)?
Flights from PHL to IAD have an average travel time of 1 hour and 14 minutes. The total distance between the two is 130 mi.
What is the best time to fly from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD)?
To touch down at Washington Dulles Intl. Airport (IAD) on time, opt for a flight that takes off from Philadelphia Intl. Airport (PHL) 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 Washington from Philadelphia Intl. Airport (PHL)?
If you're leaving on a direct flight from Philadelphia Intl. Airport (PHL) to Washington, you'll land at either Ronald Reagan Washington National Airport (DCA) or Washington Dulles Intl. Airport (IAD).
Is it cheaper to buy a plane ticket from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD) last-minute?
Last-minute bookings from PHL to IAD are usually more expensive. To secure the cheapest rates, start searching for flights early. That said, if you can play around with your travel dates, you may score a cheap fare just before your departure.
Is it cheaper to book a PHL to IAD flight and hotel package?
Compared with arranging flights and hotels separately, booking a PHL to IAD flight and hotel package with Expedia could result in significant savings. Better still, having everything in one convenient place takes the hassle out of travel planning. Simply pick your flights and choose from our wide range of stays, then customize your trip with other add-ons like car rentals and activities.
Can I cancel or change the date of my flight from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD)?
You can usually reschedule or cancel your PHL to IAD flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Check 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.