PHL - IAD

$72 Find Cheap Flights from Philadelphia to Washington Dulles Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Dulles Intl departing on 1/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C. Dulles Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Washington, D.C., as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Washington, D.C., as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$142
Frontier
Mon 1/12Mon 1/19
PHL - IAD • 1 stop
Cheapest non-stop
$179
Typical prices: $239-$249
United Airlines
Fri 1/16Mon 1/19
PHL - IAD • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
United's Economy Plus offers extra legroom on flights.
The Silver Line Metro connects IAD to downtown D.C.
Expert advice
Expert advice
Expert advice
Expert advice
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Dulles Intl!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Philadelphia to Dulles Intl (PHL-IAD)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Philadelphia to Dulles Intl that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Philadelphia to Dulles Intl

Mon, Jan 12 - Mon, Jan 19
Frontier Logo
7:12 pm - 11:43 am
PHL
-
IAD
16h 31m1 stop
Frontier Logo
10:08 pm - 12:42 am
IAD
-
PHL
26h 34m1 stop
$142Frontier
Fri, Jan 16 - Tue, Jan 20
Multiple Airlines Logo
8:43 pm - 8:38 am
PHL
-
IAD
11h 55m1 stop
Multiple Airlines Logo
11:00 am - 12:42 am
IAD
-
PHL
13h 42m1 stop
$163Multiple Airlines
Thu, Jan 8 - Sun, Jan 11
Multiple Airlines Logo
8:43 pm - 7:55 am
PHL
-
IAD
11h 12m1 stop
Multiple Airlines Logo
2:53 pm - 11:42 pm
IAD
-
PHL
8h 49m1 stop
$178Multiple Airlines
Fri, Jan 16 - Tue, Jan 20
United Airlines Logo
10:30 am - 11:47 am
PHL
-
IAD
1h 17mnonstop
United Airlines Logo
12:55 pm - 2:10 pm
IAD
-
PHL
1h 15mnonstop
$179United Airlines
Thu, Jan 8 - Sun, Jan 11
Multiple Airlines Logo
8:43 pm - 7:55 am
PHL
-
IAD
11h 12m1 stop
Multiple Airlines Logo
7:19 pm - 5:07 pm
IAD
-
PHL
21h 48m2 stops
$180Multiple Airlines
Thu, Jan 8 - Sun, Jan 11
Multiple Airlines Logo
8:43 pm - 7:55 am
PHL
-
IAD
11h 12m1 stop
Multiple Airlines Logo
2:53 pm - 11:42 pm
IAD
-
PHL
8h 49m1 stop
$182Multiple Airlines
Thu, Jan 8 - Sun, Jan 11
Multiple Airlines Logo
8:43 pm - 7:55 am
PHL
-
IAD
11h 12m1 stop
Multiple Airlines Logo
7:19 pm - 5:07 pm
IAD
-
PHL
21h 48m2 stops
$185Multiple Airlines
Fri, Jan 16 - Mon, Jan 19
Multiple Airlines Logo
5:30 am - 2:18 pm
PHL
-
IAD
8h 48m2 stops
Multiple Airlines Logo
10:08 pm - 11:14 am
IAD
-
PHL
13h 06m1 stop
$189Multiple Airlines
Fri, Jan 9 - Sun, Jan 11
Frontier Logo
7:20 pm - 9:08 am
PHL
-
IAD
13h 48m1 stop
Frontier Logo
2:53 pm - 11:42 pm
IAD
-
PHL
8h 49m1 stop
$194Frontier
Fri, Jan 9 - Sun, Jan 11
Frontier Logo
7:20 pm - 9:08 am
PHL
-
IAD
13h 48m1 stop
Frontier Logo
9:59 pm - 3:54 pm
IAD
-
PHL
17h 55m2 stops
$209Frontier
Booking Insights

KAYAK's insights & trends for Philadelphia to Dulles Intl flights

Get data-powered insights and trends into flights from Philadelphia to Dulles Intl to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Philadelphia to Washington Dulles Airport?

The average price of all round-trip flights from Philadelphia to Washington, D.C. Dulles Intl Airport clicked on KAYAK for each day over the last 12 months.

For Philadelphia to Washington Dulles Airport, Wednesday is the cheapest day to fly on average and Monday is the most expensive. Flying from Washington Dulles Airport back to Philadelphia, the best deals are generally found on Friday, with Saturday being the most expensive.

Find deals
Expert advice

Expert advice for your flight from Philadelphia to Dulles Intl

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
ANA

ANA's domestic flights offer efficient service and punctuality, typical of Japanese standards.


ANA provides slippers even in premium economy, enhancing comfort during flights.

Read more about ANABy Gabriel Leigh
United Airlines

United offers Priority Boarding to avoid gate-checking your carry-on bag.


United's Economy Plus seats offer up to six inches more legroom than standard economy.

Read more about United AirlinesBy Stefanie Waldek
Airports
PHL

PHL's SEPTA Airport Line offers a convenient 30-minute ride to downtown Philadelphia, making it an affordable option for reaching the airport.

Read more about PHLBy Harriet Baskas
IAD

The Silver Line Metro connects IAD to downtown D.C. in about 50 minutes, offering a convenient public transportation option.

Read more about IADBy Stefanie Waldek
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on ANA

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and IAD

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Harriet Baskas

Harriet Baskas

Expert on PHL

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more

Good to know

Low seasonJune
Cheapest flight$72
Best time to beat the crowds with an average 34% drop in price.
Most popular time to fly with an average 32% increase in price.
Flight from Philadelphia to Washington Dulles Airport

When to book flights from Philadelphia to Dulles Intl

Are your dates flexible? Find out the best times to travel from Philadelphia to Dulles Intl based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Philadelphia to Washington Dulles Airport flights

  • What is the cheapest flight from Philadelphia to Washington, D.C. Dulles Intl Airport?

    In the last 3 days, the lowest price for a flight from Philadelphia to Washington, D.C. Dulles Intl Airport was $72 for a one-way ticket and $142 for a round-trip.

  • Do I need a passport to fly between Philadelphia and Washington Dulles Airport?

    A passport is not required to fly from Philadelphia to Washington Dulles Airport.

  • Which airlines offer Wi-Fi service onboard planes from Philadelphia to Washington Dulles Airport?

    All the following airlines offer inflight Wi-Fi service on the Philadelphia to Washington Dulles Airport flight route: American Airlines, Japan Airlines, Delta, Iberia, Finnair, British Airways, and SWISS.

  • Which aircraft models fly most regularly from Philadelphia to Washington Dulles Airport?

    The Airbus A321neo is the aircraft model that flies most regularly on the Philadelphia to Washington Dulles Airport flight route.

  • Which airline alliances offer flights from Philadelphia to Washington Dulles Airport?

    Star Alliance is the only airline alliance operating flights between Philadelphia and Washington Dulles Airport.

  • On which days can I fly direct from Philadelphia to Washington Dulles Airport?

    There are nonstop flights from Philadelphia to Washington Dulles Airport on a daily basis.

  • How does KAYAK find such low prices on flights from Philadelphia to Washington Dulles Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Philadelphia to Washington Dulles Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Philadelphia to Washington Dulles Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from Philadelphia is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Philadelphia to Washington Dulles Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Washington Dulles Airport with an airline and back to Philadelphia with another airline. Booking your flights between Philadelphia and IAD can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Philadelphia to Washington Dulles Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Washington Dulles Airport from Philadelphia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Philadelphia to Washington, D.C. Dulles Intl Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $265 or less one-way and $503 or less round-trip.

Prefer to fly direct from Philadelphia to Washington Dulles Airport?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Philadelphia to Washington, D.C. Dulles Intl.
Find which airlines fly direct from Philadelphia Airport to Washington, D.C. Dulles Intl Airport, which days they fly and book direct flights.

Direct departures

Philadelphia to Washington, D.C. Dulles Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Direct returns

Washington, D.C. Dulles Intl to Philadelphia

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Reviews of the top airline flying from Philadelphia to Dulles Intl

 
See real verified KAYAK customer reviews for airlines flying from Philadelphia to Washington, D.C.. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Philadelphia to Dulles Intl? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9095 reviews
6.6Food
7.7Boarding
7.1Entertainment
7.3Comfort
8.1Crew
Airline reviews

The food is terrible. The same pasta or chicken with bad taste and presentation

6.0 GoodClaudia, Dec 2025
GUA - IAD
Read more United Airlines reviews

The food is terrible. The same pasta or chicken with bad taste and presentation

It was probably one of the worst flights I’ve been on. The restrooms were never cleaned or stocked. The food was very subpar, and i usually enjoy airline food, so I was disappointed. It was just all around a bad experience. The only saving grace was the flight attendants.

The only downside was my cell phone charger wouldn’t work in the charging port but everyone else’s would work in them all. My cell phone cable works fine in my hotel room in Frankfurt.

Great crew, excellent landing, good food. Over all great experience. Thank you!

One bag is incorrect and not acceptable for an international flight. The food was not just good. I won't fly with them again.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

Crew was dismissive. Snacks and refills not offered. Poor business class experience. Bed not comfortable compared to Emirates or BA.

Flight was delayed for 5 hours because crew didn’t have enough time to rest - this seems like it could have been avoided with better scheduling. Food was not good.

IAD with the archaic people movers is just a place to be avoided.

Overall, it was good. I was seating next to a wonderful lady and did not notice how time flew. Thanks

Everything you need to know for your flight from Philadelphia to Dulles Intl

Information on your arrival and departure airports

Philadelphia (PHL)
Dulles Intl (IAD)