Cheap Flights from Philadelphia to Washington Dulles from $336

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Flight deals from Philadelphia to Washington Dulles Airport

Looking for a cheap last-minute deal or the best return flight from Philadelphia to Washington Dulles Airport? If you want to travel next month, return fares start from $395. Find the lowest prices on one-way and return tickets right here.

Washington D.C..$336 per passenger.Departing Wed, 23 Sep, returning Wed, 30 Sep.Return flight with United.Outbound direct flight with United departs from Philadelphia International on Wed, 23 Sep, arriving in Washington Dulles.Inbound direct flight with United departs from Washington Dulles on Wed, 30 Sep, arriving in Philadelphia International.Price includes taxes and charges.From $336, select.

Washington D.C..$336 per passenger.Departing Thu, 23 Jul, returning Thu, 30 Jul.Return flight with United.Outbound direct flight with United departs from Philadelphia International on Thu, 23 Jul, arriving in Washington Dulles.Inbound direct flight with United departs from Washington Dulles on Thu, 30 Jul, arriving in Philadelphia International.Price includes taxes and charges.From $336, select.

Washington D.C..$336 per passenger.Departing Sat, 23 May, returning Sat, 30 May.Return flight with United.Outbound direct flight with United departs from Philadelphia International on Sat, 23 May, arriving in Washington Dulles.Inbound direct flight with United departs from Washington Dulles on Sat, 30 May, arriving in Philadelphia International.Price includes taxes and charges.From $336, select.

Washington D.C..$361 per passenger.Departing Mon, 23 Mar, returning Mon, 30 Mar.Return flight with United.Outbound direct flight with United departs from Philadelphia International on Mon, 23 Mar, arriving in Washington Dulles.Inbound direct flight with United departs from Washington Dulles on Mon, 30 Mar, arriving in Philadelphia International.Price includes taxes and charges.From $361, select.

Washington D.C..$395 per passenger.Departing Thu, 23 Apr, returning Thu, 30 Apr.Return flight with United.Outbound direct flight with United departs from Philadelphia International on Thu, 23 Apr, arriving in Washington Dulles.Inbound direct flight with United departs from Washington Dulles on Thu, 30 Apr, arriving in Philadelphia International.Price includes taxes and charges.From $395, select.

Washington D.C..$454 per passenger.Departing Fri, 23 Oct, returning Fri, 30 Oct.Return flight with United.Outbound direct flight with United departs from Philadelphia International on Fri, 23 Oct, arriving in Washington Dulles.Inbound direct flight with United departs from Washington Dulles on Fri, 30 Oct, arriving in Philadelphia International.Price includes taxes and charges.From $454, select.

Washington D.C..$471 per passenger.Departing Mon, 23 Nov, returning Mon, 30 Nov.Return flight with United.Outbound direct flight with United departs from Philadelphia International on Mon, 23 Nov, arriving in Washington Dulles.Inbound direct flight with United departs from Washington Dulles on Mon, 30 Nov, arriving in Philadelphia International.Price includes taxes and charges.From $471, select.

Washington D.C..$477 per passenger.Departing Sun, 23 Aug, returning Sun, 30 Aug.Return flight with United.Outbound direct flight with United departs from Philadelphia International on Sun, 23 Aug, arriving in Washington Dulles.Inbound direct flight with United departs from Washington Dulles on Sun, 30 Aug, arriving in Philadelphia International.Price includes taxes and charges.From $477, select.

Washington D.C..$781 per passenger.Departing Mon, 21 Dec, returning Tue, 22 Dec.Return flight with United.Outbound direct flight with United departs from Philadelphia International on Mon, 21 Dec, arriving in Washington Dulles.Inbound direct flight with United departs from Washington Dulles on Tue, 22 Dec, arriving in Philadelphia International.Price includes taxes and charges.From $781, select.

Washington D.C..$850 per passenger.Departing Thu, 14 May, returning Wed, 9 Sep.Return flight with United.Outbound direct flight with United departs from Philadelphia International on Thu, 14 May, arriving in Washington Dulles.Inbound direct flight with United departs from Washington Dulles on Wed, 9 Sep, arriving in Philadelphia International.Price includes taxes and charges.From $850, select.

Washington D.C..$852 per passenger.Departing Wed, 10 Jun, returning Sat, 13 Jun.Return flight with United.Outbound direct flight with United departs from Philadelphia International on Wed, 10 Jun, arriving in Washington Dulles.Inbound direct flight with United departs from Washington Dulles on Sat, 13 Jun, arriving in Philadelphia International.Price includes taxes and charges.From $852, select.

Find the cheapest month to fly from Philadelphia to Washington Dulles

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Philadelphia to Washington Dulles flights are currently cheapest in May.

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Direct flights from Philadelphia to Washington Dulles

Philadelphia to Washington Dulles: Alternative routes

Compare routes from Philadelphia to Washington D.C. below. You may find an airport to fly into that's cheaper, faster, or easier than Washington Dulles.

Philadelphia to Washington D.C.: Flight information

The things to know before you go.

Cheapest flight found	$336
Cheapest month to fly	May
Average flight time	1 hr, 12 mins
Most popular airline	United
Average flights per week	202

Finding cheap flights from Philadelphia to Washington Dulles: Frequently asked questions

How much are return flights from Philadelphia to Washington Dulles?

The best price we found for a return flight from Philadelphia to Washington Dulles is $336. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from Philadelphia to Washington Dulles?

1 hour and 12 minutes is the average flight time from Philadelphia to Washington Dulles.

Which airlines fly direct from Philadelphia to Washington Dulles?

United, GoJet Airlines and Mesa Airlines fly direct from Philadelphia to Washington Dulles.

How many flights are there a week from Philadelphia to Washington Dulles?

As of March 2026, there are 101 flights per week flying from Philadelphia to Washington Dulles.

When is the cheapest time to fly from Philadelphia to Washington Dulles?

The cheapest month to fly from Philadelphia to Washington Dulles is usually May.

Which upcoming date is cheapest to fly from Philadelphia to Washington Dulles Airport on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Philadelphia to Washington Dulles Airport on Saturday, 23 May 2026.

Can I get a direct flight from Philadelphia to Washington Dulles Airport?

Yes – the average flight time is 1 hour and 12 minutes.

How can I find the best flight deal to Washington Dulles?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Washington Dulles but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Washington D.C.?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Washington D.C. is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from Philadelphia to Washington Dulles with?

The cheapest airline that flies to Washington Dulles is United .

Travelling from Philadelphia to Washington Dulles International Airport (IAD): What you need to know

Start your journey at one of Philadelphia's main airports, Philadelphia International Airport (PHL) or Trenton-Mercer Airport (TTN). Explore your options for booking a flight from Philadelphia to Washington Dulles International Airport (IAD) departing from either of these.
Expect to be travelling for 1 hour 10 minutes. On average, that's the time it takes for a direct Philadelphia to Washington Dulles International Airport flight.
Washington DC's timezone is UTC-4, which is the same as Philadelphia. Washington Dulles International Airport is located in Washington DC.
With 23 direct flights a week between the two airports, Philadelphia International Airport (PHL) to Washington Dulles International Airport (IAD) is the busiest route. United Airlines operates the earliest flight at 6:10am. If you're eager to make the most of your day before jetting off, the last departure from PHL to IAD is with United Airlines at 7:59pm.
To ensure you get on your flight from Philadelphia to IAD, leave enough time for things like baggage drop and finding your gate. Turning up two hours before international departures and an hour before domestic flights is the general travel rule.
With more people on the move during high season, aim to get to your terminal earlier than usual. Two hours for domestic flights and up to four for international journeys will allow for additional wait times.

Airports in Philadelphia

Philadelphia International Airport (PHL)

You can find a direct flight from Philadelphia to Washington Dulles International Airport (IAD) leaving from Philadelphia International Airport (PHL).
You'll find a direct flight from Philadelphia to Washington Dulles International Airport with United Airlines. This well-known airline offers services from PHL.
Most passengers prefer to book seats with United Airlines from PHL to IAD.
With a reliable 85.23% of services arriving as scheduled, United Airlines is the top on-time carrier serving this route.
Travelling from central Philadelphia to PHL takes about 45 minutes by public transport. If you ride-share, drive or take a cab, you'll cover the 19 kilometres in 15 minutes or so, depending on traffic conditions.
Booked an early flight from Philadelphia to Washington Dulles International Airport? Avoid the mad dash to the terminal (and enjoy a few extra z's) by staying at one of these stays near Philadelphia International Airport:
Of all flights leaving Philadelphia International Airport, 78.93% land on time at their destination.
You'll find PHL at 8500 Essington Ave.

Trenton-Mercer Airport (TTN)

TTN is about 56 kilometres from central Philadelphia. It takes 40 minutes or so to get to the airport in a car from the city centre. Public transport takes roughly 1 hour 45 minutes.
Want to treat yourself to an extra night away before your Philadelphia to IAD flight? Relax in a hotel near Trenton-Mercer Airport before your holiday officially begins. These stays have a room with your name on it:
Trenton-Mercer Airport has earned its reputation for punctuality. 82.45% of flights leaving here arrive right when they're supposed to.
The address for TTN is Scotch Road, Terminal Building.

About Washington Dulles International Airport (IAD)

The last thing you want is a lengthy journey to your hotel if you're arriving on a late flight from Philadelphia to Washington Dulles International Airport. Get comfy at one of these accommodation options near IAD instead:
Go wherever you want, whenever you want with a Washington Dulles International Airport rental car. Book your wheels from Dollar, Thrifty or Sixt and discover more of Washington DC and beyond.
To secure the lowest price, book your ride around one week in advance of your Philadelphia to Washington Dulles International Airport flight.
IAD is located at 1 Saarinen Circle.

Getting from Washington Dulles International Airport (IAD) to central Washington DC

Central Washington DC is roughly 40 kilometres from Washington Dulles International Airport. Travel times by cab or car hire will vary depending on traffic conditions, so do some research before your trip.
It typically takes 1 hour 10 minutes if you're travelling on public transport.

How to find the cheapest flights from Philadelphia to Washington Dulles International Airport (IAD)

At the moment, $341 is the best price we've found for a one-way ticket from Philadelphia to Washington Dulles International Airport. The cheapest price for a return flight is $336. Remember fares may change due to availability at the time of booking.
Don't wait until the last moment. You're more likely to walk away with cheap flights from Philadelphia to IAD if you book ahead. Airlines often have some fantastic early bird discounts.
The 'Whole month' tool shows you the cheapest Philadelphia to Washington Dulles International Airport tickets across the entire month. It's an easy way to find a bargain if your travel dates are flexible.
There's no need to search every day to find out if fares have dropped when you create a Price Alert. We'll let you know the moment a better deal is available on flight tickets from Philadelphia to IAD.
Tailor your travel plans using filters. Pick your ideal departure and arrival times, total journey duration and airlines. You can also sort your results by 'Best,' 'Fastest' or 'Cheapest' flights from Philadelphia to Washington Dulles International Airport.

The best time to fly from Philadelphia to Washington Dulles International Airport (IAD)

February is the quietest month for flights from Philadelphia to Washington Dulles International Airport (IAD), while July is the most popular. Figure out the ideal time to visit Washington DC based on whether you want a laid-back vibe or a lively atmosphere.
When booking your Philadelphia to IAD flight ticket, consider the weather you're most comfortable in. July is the warmest month in Washington DC, with temperatures ranging from 19ºC to 33ºC.
Search for cheap tickets from Philadelphia to Washington Dulles International Airport in January if you'd rather travel during cooler conditions. Temperatures are at their lowest then, ranging between -6ºC and 10ºC.

More about Washington DC

When it comes to looking for somewhere to rest your head, you'll find the top stays in Washington DC right here. Explore these hotels once you've locked in your flight from Philadelphia to Washington Dulles International Airport:
There are so many things to do and see in this city, it can be difficult to know where to start. Smithsonian, Lincoln Memorial and The White House are popular attractions which should be on any good Washington DC itinerary.

Explore more of the United States

Philadelphia is just one of the many places in the United States waiting to be explored once you've taken in the sights of Washington DC. Around 225 kilometres away to the north-east, its best attractions include Independence Hall, Liberty Bell and Philadelphia Museum of Art.
Virginia Beach is another favourite destination in the United States and is around 274 kilometres south-east of Washington DC. No trip is complete without seeing Virginia Beach Oceanfront, Virginia Beach Boardwalk and Resort Beach.