£259 Cheap Flights from Washington (IAD) to Philadelphia (PHL)

View £259 flight on Wed, 16 Sept 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at £259 for one-way flights and £444 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Wed, 16 Sept - Wed, 23 Sept
IAD
Washington
PHL
Philadelphia
£444 Return, found 6 hours ago
£444
Return
found 6 hours ago
Select Alaska Airlines flight, departing Wed, 16 Sept from Washington to Philadelphia, returning Wed, 23 Sept, priced at £444 found 6 hours ago
Alaska Airlines
Sat, 24 Oct - Sat, 31 Oct
IAD
Washington
PHL
Philadelphia
£527 Return, just found
£527
Return
just found
Select Alaska Airlines flight, departing Sat, 24 Oct from Washington to Philadelphia, returning Sat, 31 Oct, priced at £527 just found
Alaska Airlines
Fri, 6 Nov - Sun, 8 Nov
IAD
Washington
PHL
Philadelphia
£543 Return, found 3 days ago
£543
Return
found 3 days ago
Select Alaska Airlines flight, departing Fri, 6 Nov from Washington to Philadelphia, returning Sun, 8 Nov, priced at £543 found 3 days ago
Alaska Airlines
Thu, 27 Aug - Sat, 29 Aug
IAD
Washington
PHL
Philadelphia
£547 Return, found 6 days ago
£547
Return
found 6 days ago
Select Alaska Airlines flight, departing Thu, 27 Aug from Washington to Philadelphia, returning Sat, 29 Aug, priced at £547 found 6 days ago
Alaska Airlines
Wed, 16 Sept - Wed, 23 Sept
IAD
Washington
PHL
Philadelphia
£606 Return, found 6 hours ago
£606
Return
found 6 hours ago
Select Alaska Airlines flight, departing Wed, 16 Sept from Washington to Philadelphia, returning Wed, 23 Sept, priced at £606 found 6 hours ago
Alaska Airlines
Wed, 16 Sept - Wed, 23 Sept
IAD
Washington
PHL
Philadelphia
£614 Return, found 6 hours ago
£614
Return
found 6 hours ago
Select Alaska Airlines flight, departing Wed, 16 Sept from Washington to Philadelphia, returning Wed, 23 Sept, priced at £614 found 6 hours ago
Alaska Airlines
Sat, 24 Oct - Sat, 31 Oct
IAD
Washington
PHL
Philadelphia
£690 Return, just found
£690
Return
just found
Select Alaska Airlines flight, departing Sat, 24 Oct from Washington to Philadelphia, returning Sat, 31 Oct, priced at £690 just found
Alaska Airlines
Thu, 27 Aug - Fri, 28 Aug
IAD
Washington
PHL
Philadelphia
£694 Return, found 6 days ago
£694
Return
found 6 days ago
Select Alaska Airlines flight, departing Thu, 27 Aug from Washington to Philadelphia, returning Fri, 28 Aug, priced at £694 found 6 days ago
Alaska Airlines
Sat, 24 Oct - Sat, 31 Oct
IAD
Washington
PHL
Philadelphia
£696 Return, just found
£696
Return
just found
Select Alaska Airlines flight, departing Sat, 24 Oct from Washington to Philadelphia, returning Sat, 31 Oct, priced at £696 just found
Alaska Airlines
Fri, 6 Nov - Sun, 8 Nov
IAD
Washington
PHL
Philadelphia
£702 Return, found 3 days ago
£702
Return
found 3 days ago
Select Alaska Airlines flight, departing Fri, 6 Nov from Washington to Philadelphia, returning Sun, 8 Nov, priced at £702 found 3 days ago

Frequently asked questions

What is the cheapest month to fly from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
February is typically the cheapest month to fly from Washington Dulles Intl. (IAD) to Philadelphia Intl. (PHL), with average return fares of approximately £408. This is about 26% lower than the average price throughout the year. February often sees lower prices as it falls outside of peak holiday travel periods, leading to less demand. Other cheap months to fly from Washington Dulles Intl. (IAD) to Philadelphia Intl. (PHL) include November and December.
Which airlines fly direct from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
Enter IAD to PHL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
To find a cheap flight from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
The best airline to fly with from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.) will differ from traveller to traveller. If you like to fly early, UA offers early morning flights. If price is the most important factor, UA typically offers the lowest fares. DL offers the most daily flights from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.), which is brilliant if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
When looking for the best time to fly from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.), you'll find that February and December are typically the cheapest months, with average return flights around £408. However, August is the most popular month for this route, meaning there are plenty of flight options available, though prices might be higher. This information is based on booking data from the past year.
How many flights per day from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
There are approximately 5 nonstop flights per day from Washington Dulles Intl. (IAD) to Philadelphia Intl. (PHL). For even more choice, look at flights that include layovers, as there are around 22 connecting flights per day. Some common connection points include Hartsfield-Jackson Atlanta Intl. (ATL), Charlotte-Douglas Intl. (CLT), and Detroit Metropolitan Wayne County (DTW).
What is the earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
The earliest flight from Washington Dulles Intl. (IAD) to Philadelphia Intl. (PHL) typically departs at approximately 5:00 AM local time, operated by American Airlines. This is a seasonal service active in February. An early departure like this can help you maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
You'll typically find the most flights from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.) on a Monday, with around 25 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Delta Air Lines, United Airlines, and American Airlines. Flight schedules are consistent throughout the week.
What are the most popular departure times for flights from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
The most popular departure times for flights from Washington Dulles Intl. (IAD) to Philadelphia Intl. (PHL) are in the early afternoon, from 12pm to 3pm. About 36% of passengers prefer this time. Many major carriers, including United Airlines, Delta Air Lines and American Airlines, offer flights during this window. This timing works well because it allows for a productive morning before your flight, getting you to Philadelphia in the afternoon.
How long does it take to fly from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
Direct flights from IAD to PHL usually take about 1 hour 20 minutes, traveling roughly 134 miles. If you opt for a connecting flight, expect to add around 4 hours 30 minutes to your journey. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
Select the "Business class" and "First class" filters when looking for IAD to PHL flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.) flight with Expedia?
It's easy to earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Philadelphia from Washington Dulles Intl. (IAD)?
If you're planning to travel to Philadelphia from Washington Dulles Intl. (IAD), you can fly directly into Philadelphia Intl. (PHL) Some flights may connect through major hubs like Charlotte-Douglas Intl. (CLT), DuBois Regional (DUJ), Bradford Regional (BFD) before reaching Philadelphia. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.) at the last minute?
Typically, booking a last minute flight from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.) flight and hotel package?
Securing a Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
If you booked your Washington, DC (IAD-Washington Dulles Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Philadelphia Intl.
Return price
£443
Distance
214 km
Average flight time
1 hour 17 mins

Book with confidence

Compare flights from Washington to Philadelphia easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Washington to Philadelphia. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Philadelphia Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Washington Dulles Intl. to Philadelphia Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Washington Dulles Intl. (IAD) to Philadelphia Intl. (PHL)

The easiest way to view the best deals on flights from Washington to Philadelphia today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Washington Dulles Intl. to Philadelphia Intl. start at just £444 and range up to £702.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Washington and Philadelphia
  • booking your flight during September, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Washington to Philadelphia flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Washington Dulles Intl. to Philadelphia Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Washington to Philadelphia easily and book with confidence

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