$80 Cheap Flights from Philadelphia (PHL) to Washington (IAD)

View $80 flight on Wed, Oct 15, 2025Opens in a new window

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

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Cheap Flights from Philadelphia to Washington (PHL-IAD)

Prices were available within the past 7 days and start at $80 for one-way flights and $163 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Aug 28 - Sat, Sep 13
PHL
Philadelphia
IAD
Washington
$163 Roundtrip, found 3 days ago
$163
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Thu, Aug 28 from Philadelphia to Washington, returning Sat, Sep 13, priced at $163 found 3 days ago
Frontier Airlines
Thu, Aug 28 - Thu, Sep 11
PHL
Philadelphia
IAD
Washington
$164 Roundtrip, found 3 days ago
$164
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Thu, Aug 28 from Philadelphia to Washington, returning Thu, Sep 11, priced at $164 found 3 days ago
Frontier Airlines
Tue, Oct 14 - Tue, Oct 21
PHL
Philadelphia
IAD
Washington
$165 Roundtrip, found 2 days ago
$165
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Tue, Oct 14 from Philadelphia to Washington, returning Tue, Oct 21, priced at $165 found 2 days ago
Frontier Airlines
Tue, Sep 2 - Thu, Sep 18
PHL
Philadelphia
IAD
Washington
$166 Roundtrip, found 1 day ago
$166
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Sep 2 from Philadelphia to Washington, returning Thu, Sep 18, priced at $166 found 1 day ago
Frontier Airlines
Thu, Sep 11 - Mon, Sep 15
PHL
Philadelphia
IAD
Washington
$167 Roundtrip, found 17 hours ago
$167
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Thu, Sep 11 from Philadelphia to Washington, returning Mon, Sep 15, priced at $167 found 17 hours ago
Frontier Airlines
Mon, Aug 18 - Wed, Aug 20
PHL
Philadelphia
IAD
Washington
$170 Roundtrip, found 1 day ago
$170
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Mon, Aug 18 from Philadelphia to Washington, returning Wed, Aug 20, priced at $170 found 1 day ago
Frontier Airlines
Thu, Aug 28 - Sun, Sep 14
PHL
Philadelphia
IAD
Washington
$174 Roundtrip, found 3 days ago
$174
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Thu, Aug 28 from Philadelphia to Washington, returning Sun, Sep 14, priced at $174 found 3 days ago
United
Fri, Jul 25 - Sat, Jul 26
PHL
Philadelphia
IAD
Washington
$179 Roundtrip, found 3 days ago
$179
Roundtrip
found 3 days ago
Select United flight, departing Fri, Jul 25 from Philadelphia to Washington, returning Sat, Jul 26, priced at $179 found 3 days ago
Delta
Tue, Sep 16 - Tue, Sep 23
PHL
Philadelphia
IAD
Washington
$263 Roundtrip, found 5 days ago
$263
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Sep 16 from Philadelphia to Washington, returning Tue, Sep 23, priced at $263 found 5 days ago
American Airlines
Sat, Jul 19 - Sun, Jul 20
PHL
Philadelphia
IAD
Washington
$289 Roundtrip, found 7 hours ago
$289
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Sat, Jul 19 from Philadelphia to Washington, returning Sun, Jul 20, priced at $289 found 7 hours ago

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

August is typically the cheapest month to fly

From $159 - $1,571 per traveler.

Graph displaying average flight prices per month

Flights from Philadelphia (PHL) to Washington (IAD)
Origin airport
Philadelphia Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, United
Roundtrip price
$163
Distance
133 mi
Average flight time
1 hour 7 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 August. 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 $80 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 $179 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 July 24 2025 and touching down at IAD. The price was last updated on June 30 2025 and has not changed since.
What is the cheapest month to fly from PHL to IAD?
To land a cheap ticket, search for direct flights from PHL to IAD that depart in September. You can find a one-way United flight for $204 leaving on September 24 2025. This price is based on the cheapest direct flight found on Expedia for this route in the next 330 days. The price was last updated on June 30 2025 and remains unchanged.
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 $204 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 September 24 2025. Prices were last updated on June 30 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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