IAD - PHL

$104 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 10/15. 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

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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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

Mon, Sep 29 - Fri, Oct 3
Frontier Logo
1:55 pm - 12:57 amIAD-PHL
11h 02m1 stop
Frontier Logo
5:15 am - 6:19 pmPHL-IAD
13h 04m1 stop
$153Frontier
Find Deal
Fri, Oct 3 - Sun, Oct 5
Frontier Logo
1:55 pm - 12:59 amIAD-PHL
11h 04m1 stop
Frontier Logo
11:24 am - 9:24 pmPHL-IAD
10h 00m1 stop
$154Frontier
Find Deal
Fri, Oct 10 - Tue, Oct 14
Frontier Logo
3:10 pm - 12:25 amIAD-PHL
9h 15m1 stop
Frontier Logo
10:22 am - 7:46 pmPHL-IAD
9h 24m1 stop
$159Frontier
Find Deal
Fri, Oct 10 - Tue, Oct 14
United Airlines Logo
5:45 pm - 6:57 pmIAD-PHL
1h 12mnonstop
United Airlines Logo
7:58 pm - 9:05 pmPHL-IAD
1h 07mnonstop
$179United Airlines
Find Deal
Tue, Oct 7 - Thu, Oct 9
Frontier Logo
9:00 am - 4:35 pmIAD-PHL
7h 35m1 stop
Frontier Logo
5:20 am - 3:38 pmPHL-IAD
10h 18m1 stop
$180Frontier
Find Deal
Sat, Dec 27 - Sun, Jan 4
United Airlines Logo
12:55 pm - 2:07 pmIAD-PHL
1h 12mnonstop
United Airlines Logo
6:00 am - 7:15 amPHL-IAD
1h 15mnonstop
$188United Airlines
Find Deal
Fri, Oct 10 - Tue, Oct 14
Multiple Airlines Logo
6:15 am - 10:35 amIAD-PHL
28h 20m2 stops
Multiple Airlines Logo
1:02 pm - 7:46 pmPHL-IAD
6h 44m1 stop
$249Multiple Airlines
Find Deal
Fri, Oct 10 - Sun, Oct 12
Multiple Airlines Logo
6:15 am - 10:30 pmIAD-PHL
16h 15m2 stops
Multiple Airlines Logo
5:20 am - 6:32 pmPHL-IAD
13h 12m1 stop
$256Multiple Airlines
Find Deal
Sat, Sep 27 - Sun, Sep 28
American Airlines Logo
12:48 pm - 7:40 pmIAD-PHL
6h 52m1 stop
American Airlines Logo
6:03 am - 11:34 amPHL-IAD
5h 31m1 stop
$289American Airlines
Find Deal
Thu, Feb 19 - Sat, Feb 21
American Airlines Logo
8:52 am - 12:37 pmIAD-PHL
3h 45m1 stop
American Airlines Logo
11:50 am - 3:58 pmPHL-IAD
4h 08m1 stop
$290American Airlines
Find Deal

Everything you should know

Our travelers' advice
AI-generated summary based on content written by travel experts
For a quick departure from IAD, use the AeroTrain.
Use the SEPTA Airport Line for a 30-minute ride to downtown.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Frontier
Cheapest • from $153 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
March
Cheapest • 45% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$153
Overall average: $199
Frontier
Mon 9/29Fri 10/3
IAD - PHL • 1 stop
Cheapest non-stop
$179
Typical prices: $239-473
United Airlines
Fri 10/10Tue 10/14
IAD - PHL • Non-stop
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!
Expert advice

Expert advice for your flight from Dulles Intl to Philadelphia

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airports
IAD

For a quick departure from IAD, use the AeroTrain for fast access between terminals, especially during busy hours.

Read more about IADby Stefanie Waldek
PHL

Use the SEPTA Airport Line for a cost-effective 30-minute ride to downtown Philadelphia from PHL.

Read more about PHLby Harriet Baskas
Our travel experts
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
Stefanie Waldek

Stefanie Waldek

Expert on 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
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.

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 Saturday, as it's usually the priciest day. When flying back from Philadelphia, Wednesday 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 March, where tickets cost $199 (return) on average. On the other hand, the most expensive months are August and January, where the average cost of round-trip tickets is $590 and $467 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.

No, with an average price for the route of $353, prices are generally cheapest when you fly direct.

Good to know

Low seasonJune
Cheapest flight$104
Best time to beat the crowds but there is an average 26% increase in price.
Most popular time to fly and prices are also 1% lower on average.
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 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Philadelphia was $104 for a one-way ticket and $153 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, Finnair, and Iberia 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 Canadair (Bombardier) Regional Jet CRJ-550 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 $404 or less one-way and $353 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 8929 reviews
7.1Entertainment
8.1Crew
7.7Boarding
6.6Food
7.3Comfort
Airline reviews

Great service on board. Boarding a bit slow due to process. Food was pretty average.

8.0 ExcellentTim, Aug 2025IAD - MUC
Read more United Airlines reviews

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Very small cramped plane for an international flight. Everything else was good, but it was maybe the smallest comfort-wise I've ever been on for longer than 3-4 hours and the trip was 7.5

Flight was delayed 3 hours. No food and drink vouchers was provided. They offered a mini pretzel bag and water .

Staff was rude. Didn’t give water for 2 hours. Worst service

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

I liked the choice of lemon ginger tea. I think stewardesses can be more considerate of older people needs.

We were given vouchers we couldn’t use with a 5.5 hour delay

I fly UAL 7-8 times per year. This flight was not up to snuff because it boarded very late "due to unexpected delays in restocking the plane" and yet Flight Aware showed the plane had landed some 10 hours earlier--so I think they could have planned accordingly. The FA's were nice but harried. The video system had to be rebooted 3-4 times. The food service was rather abrupt; they forgot my row and when I asked for my meal, they brought it with some impatience. Overall, the flight was fine, but the little details made it feel somewhat mundane and hurried.

I didn’t get on plane. Passport being processed by consulate with visa application. Tried to cancel through underpricer after purchasing cacelling for any reason. No dice, they are thieves.

When I booked it on Kayak it aaid that I wasn't allowed hamd luggage. I called United Airlines and it took them 6 minutes to figure out if I was allowed free hand luggage. Surely something that simple they should be able to tell me instantly.

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

Information on your arrival and departure airports

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