IAD - PHL

$101 Find Cheap Flights from Washington Dulles Airport to Philadelphia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to Philadelphia departing on 7/8. 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 Philadelphia

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

Cheapest round-trip
$191
Typical prices: $587-$229
Frontier
Wed 9/16Wed 9/23
IAD - PHL • 1 stop
Cheapest non-stop
$239
Typical prices: $378-$309
United Airlines
Thu 7/9Sun 7/12
IAD - PHL • Non-stop
Top airlines
Cheapest • from $195 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with United Airlines. Average duration is 1h 14m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $184 (round-trip)
Shortest trip • 4h 13m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 53% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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 Philadelphia!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl to Philadelphia 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 Dulles Intl to Philadelphia

Wed, Sep 16 - Wed, Sep 23
Frontier Logo
7:00 am - 1:12 pm
IAD
-
PHL
6h 12m
1 stop
Frontier Logo
5:28 pm - 12:28 am
PHL
-
IAD
7h 00m
1 stop
$191Frontier
Tue, Jul 21 - Wed, Jul 22
Frontier Logo
7:49 am - 10:28 pm
IAD
-
PHL
14h 39m
1 stop
Frontier Logo
8:30 am - 5:14 pm
PHL
-
IAD
8h 44m
1 stop
$195Frontier
Tue, Sep 15 - Fri, Oct 2
Frontier Logo
7:00 am - 1:12 pm
IAD
-
PHL
6h 12m
1 stop
Frontier Logo
5:28 pm - 12:28 am
PHL
-
IAD
7h 00m
1 stop
$205Frontier
Tue, Sep 15 - Thu, Oct 1
Frontier Logo
7:00 am - 1:12 pm
IAD
-
PHL
6h 12m
1 stop
Frontier Logo
5:28 pm - 12:28 am
PHL
-
IAD
7h 00m
1 stop
$210Frontier
Sun, Sep 13 - Sun, Sep 27
Frontier Logo
7:00 am - 1:12 pm
IAD
-
PHL
6h 12m
1 stop
Frontier Logo
5:28 pm - 12:28 am
PHL
-
IAD
7h 00m
1 stop
$215Frontier
Sat, Jul 11 - Sat, Jul 18
Frontier Logo
8:33 pm - 7:15 am
IAD
-
PHL
10h 42m
1 stop
Frontier Logo
4:30 pm - 10:55 pm
PHL
-
IAD
6h 25m
1 stop
$217Frontier
Sat, Sep 19 - Fri, Oct 2
Frontier Logo
7:00 am - 1:12 pm
IAD
-
PHL
6h 12m
1 stop
Frontier Logo
5:28 pm - 12:28 am
PHL
-
IAD
7h 00m
1 stop
$219Frontier
Thu, Aug 20 - Sun, Aug 23
Frontier Logo
7:30 am - 10:29 pm
IAD
-
PHL
14h 59m
1 stop
Frontier Logo
8:30 am - 4:20 pm
PHL
-
IAD
7h 50m
1 stop
$220Frontier
Thu, Aug 13 - Sun, Aug 16
Frontier Logo
8:33 pm - 7:15 am
IAD
-
PHL
10h 42m
1 stop
Frontier Logo
1:32 pm - 5:14 pm
PHL
-
IAD
27h 42m
1 stop
$224Frontier
Thu, Jul 23 - Thu, Jul 30
Multiple Airlines Logo
7:49 am - 7:20 pm
IAD
-
PHL
11h 31m
1 stop
Multiple Airlines Logo
6:18 pm - 2:26 pm
PHL
-
IAD
20h 08m
1 stop
$228Multiple Airlines
Booking Insights

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

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

How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to Philadelphia?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Dulles Intl Airport to Philadelphia departing in September.

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

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

If you are looking for a flight deal from Washington Dulles Airport to Philadelphia, look for departures on Fridays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Philadelphia, Friday is the cheapest day to fly and Saturday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to Philadelphia, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. Dulles Intl Airport to Philadelphia is November, where tickets cost $184 (return) on average. On the other hand, the most expensive months are June and August, where the average cost of round-trip tickets is $597 and $590 respectively.

Can I save money by flying with a layover from Washington, D.C. Dulles Intl Airport to Philadelphia?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $308 on average.

Expert advice

Expert advice for your flight from Dulles Intl to Philadelphia

 
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.
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on PHL

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.

Stefanie Waldek

Stefanie Waldek

Expert on IAD

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.

Good to know

Low seasonJanuary
Cheapest flight$101
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly with an average 50% increase in price.
Flight from Washington Dulles Airport to Philadelphia

When to book flights from Dulles Intl to Philadelphia

Are your dates flexible? Find out the best times to travel from Dulles Intl to Philadelphia 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 Washington Dulles Airport to Philadelphia flights

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

    In the last 5 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Philadelphia was $101 for a one-way ticket and $195 for a round-trip.

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

    No, a passport isn't needed to fly from Washington Dulles Airport to Philadelphia. However, local authorities might ask for an official ID.

  • Which airports will I be using when flying from Washington Dulles Airport to Philadelphia?

    When flying out of Washington Dulles Airport you will be using Washington, D.C. Dulles Intl. You will be landing at Philadelphia, also known as Philadelphia.

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

    American Airlines, Iberia, and Finnair offer inflight Wi-Fi service on the Washington Dulles Airport to Philadelphia flight route.

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

    The Embraer 175 (Enhanced Winglets) is the aircraft model that flies most regularly on the Washington Dulles Airport to Philadelphia flight route.

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

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

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

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

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

    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 Washington Dulles Airport to Philadelphia.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Philadelphia from Washington Dulles Airport 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 Washington Dulles Airport to Philadelphia?

    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 Philadelphia with an airline and back to Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport and PHL 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 Washington Dulles Airport to Philadelphia?

    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 Philadelphia from Washington Dulles Airport 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 Washington, D.C. Dulles Intl Airport to Philadelphia

  • Looking for a cheap flight? 25% of our users found flights on this route for $243 or less one-way and $309 or less round-trip.

Prefer to fly direct from Washington Dulles Airport to Philadelphia?

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

Direct departures

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

Direct returns

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

Reviews of the top airline flying from Dulles Intl to Philadelphia

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Philadelphia. 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 Dulles Intl to Philadelphia? 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 9830 reviews
7.1Entertainment
6.6Food
8.1Crew
7.7Boarding
7.3Comfort
Airline reviews

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

6.0 GoodEnrique, Jun 2026
IAD - LAX
Read more United Airlines reviews

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

Our flight was canceled same day and we were never informed. Had to pay more and worse seating on another airline.

Did not like that we couldn't complete check in on-line without providing pictures of our passports. Worry about identity theft. We had no delays and boarding was handled In an efficient manner.

Excellent! I got to Munich and was transferred to my Lufthansa flight quickly, in 15 to 20 minutes, so I did not miss my flight. However, I had checked my overhead bag at the boarding gate in Tampa. That got to Tunis the next day. That is to be expected.

WiFi didn’t exist , seats were super cramped, lights stayed on near my seat for a long time while others were dimmed, the food/trash/drink cart hit my shoulder at least a couple of times while moving, food options were down to just one option by the time it got to my row, the utensils were garbage (knife bent at a couple of places by the time I was done eating) the spoon was very flimsy plastic

Vegetarian selection could be better. Bread was too hard to chew.

Crew was friendly and competent. Food, wine, and entertainment were excellent except the raw tuna on the flight to Split. Recommend against serving that - at least as the only option. Many medical conditions do not allow people to eat raw fish.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

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

Information on your arrival and departure airports