$97 Cheap Flights from Philadelphia (PHL) to Washington (IAD)

View $97 flight on Tue, Jun 3, 2025Opens in a new window

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

Find available prices by choosing your travel dates.

Cheap Flights from Philadelphia to Washington (PHL-IAD)

Prices were available within the past 7 days and start at $97 for one-way flights and $178 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, May 10 - Tue, May 13
PHL
Philadelphia
IAD
Washington
$178 Roundtrip, found 5 days ago
$178
Roundtrip
found 5 days ago
Select United flight, departing Sat, May 10 from Philadelphia to Washington, returning Tue, May 13, priced at $178 found 5 days ago
United
Thu, May 22 - Sat, May 24
PHL
Philadelphia
IAD
Washington
$179 Roundtrip, found 4 hours ago
$179
Roundtrip
found 4 hours ago
Select United flight, departing Thu, May 22 from Philadelphia to Washington, returning Sat, May 24, priced at $179 found 4 hours ago
United
Thu, May 22 - Sat, May 24
PHL
Philadelphia
IAD
Washington
$184 Roundtrip, found 4 hours ago
$184
Roundtrip
found 4 hours ago
Select United flight, departing Thu, May 22 from Philadelphia to Washington, returning Sat, May 24, priced at $184 found 4 hours ago
United
Wed, May 7 - Wed, May 14
PHL
Philadelphia
IAD
Washington
$184 Roundtrip, found 1 day ago
$184
Roundtrip
found 1 day ago
Select United flight, departing Wed, May 7 from Philadelphia to Washington, returning Wed, May 14, priced at $184 found 1 day ago
United
Thu, Jun 12 - Wed, Jul 2
PHL
Philadelphia
IAD
Washington
$186 Roundtrip, found 6 hours ago
$186
Roundtrip
found 6 hours ago
Select United flight, departing Thu, Jun 12 from Philadelphia to Washington, returning Wed, Jul 2, priced at $186 found 6 hours ago
United
Sat, May 17 - Sun, Jun 1
PHL
Philadelphia
IAD
Washington
$188 Roundtrip, found 6 days ago
$188
Roundtrip
found 6 days ago
Select United flight, departing Sat, May 17 from Philadelphia to Washington, returning Sun, Jun 1, priced at $188 found 6 days ago
United
Sat, May 10 - Thu, May 15
PHL
Philadelphia
IAD
Washington
$189 Roundtrip, found 3 hours ago
$189
Roundtrip
found 3 hours ago
Select United flight, departing Sat, May 10 from Philadelphia to Washington, returning Thu, May 15, priced at $189 found 3 hours ago
United
Sat, Jun 21 - Tue, Jul 1
PHL
Philadelphia
IAD
Washington
$190 Roundtrip, found 20 hours ago
$190
Roundtrip
found 20 hours ago
Select United flight, departing Sat, Jun 21 from Philadelphia to Washington, returning Tue, Jul 1, priced at $190 found 20 hours ago
American Airlines
Fri, May 9 - Fri, May 16
PHL
Philadelphia
IAD
Washington
$289 Roundtrip, just found
$289
Roundtrip
just found
Select American Airlines flight, departing Fri, May 9 from Philadelphia to Washington, returning Fri, May 16, priced at $289 just found
Delta
Sat, May 17 - Sat, May 24
PHL
Philadelphia
IAD
Washington
$421 Roundtrip, found 3 hours ago
$421
Roundtrip
found 3 hours ago
Select Delta flight, departing Sat, May 17 from Philadelphia to Washington, returning Sat, May 24, priced at $421 found 3 hours ago
Flights from Philadelphia (PHL) to Washington (IAD)
Origin airport
Philadelphia Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
American Airlines, Delta, United
Roundtrip price
$178
Distance
133 mi

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 May. 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 $97 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?
Snag cheap return fares starting at $170 from Philadelphia Intl. Airport (PHL) to Washington Dulles Intl. Airport (IAD). 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 PHL on May 20 2025 and touching down at IAD. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from PHL to IAD?
The cheapest flights from PHL to IAD 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 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 PHL to IAD?
With tickets starting at $81 for a one-way flight from PHL to IAD, United is currently the cheapest carrier flying this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from PHL on May 14 2025. Prices were last updated on April 24 2025 and have not changed since.
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.