£118 Cheap Flights from Portland (PDX) to Washington (IAD)

View £118 flight on Wed, 24 Sep 2025Opens in a new window

Popular airlines from Portland International Airport (PDX) to Washington Dulles International Airport (IAD)

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Cheap Flights from Portland (PDX) to Washington (IAD)

Prices were available within the past 7 days and start at £118 for one-way flights and £234 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sat, 4 Oct - Sat, 11 Oct
PDX
Portland
IAD
Washington
£234 Return, found 5 days ago
£234
Return
found 5 days ago
Select Alaska Airlines flight, departing Sat, 4 Oct from Portland to Washington, returning Sat, 11 Oct, priced at £234 found 5 days ago
Alaska Airlines
Sat, 11 Oct - Sat, 18 Oct
PDX
Portland
IAD
Washington
£237 Return, found 6 days ago
£237
Return
found 6 days ago
Select Alaska Airlines flight, departing Sat, 11 Oct from Portland to Washington, returning Sat, 18 Oct, priced at £237 found 6 days ago
Alaska Airlines
Wed, 15 Oct - Sat, 18 Oct
PDX
Portland
IAD
Washington
£256 Return, found 2 days ago
£256
Return
found 2 days ago
Select Alaska Airlines flight, departing Wed, 15 Oct from Portland to Washington, returning Sat, 18 Oct, priced at £256 found 2 days ago
Alaska Airlines
Sat, 4 Oct - Sat, 11 Oct
PDX
Portland
IAD
Washington
£258 Return, found 5 days ago
£258
Return
found 5 days ago
Select Alaska Airlines flight, departing Sat, 4 Oct from Portland to Washington, returning Sat, 11 Oct, priced at £258 found 5 days ago
Alaska Airlines
Sat, 11 Oct - Sat, 18 Oct
PDX
Portland
IAD
Washington
£273 Return, found 6 days ago
£273
Return
found 6 days ago
Select Alaska Airlines flight, departing Sat, 11 Oct from Portland to Washington, returning Sat, 18 Oct, priced at £273 found 6 days ago
Alaska Airlines
Wed, 15 Oct - Sat, 18 Oct
PDX
Portland
IAD
Washington
£280 Return, found 2 days ago
£280
Return
found 2 days ago
Select Alaska Airlines flight, departing Wed, 15 Oct from Portland to Washington, returning Sat, 18 Oct, priced at £280 found 2 days ago
Alaska Airlines
Fri, 17 Oct - Fri, 24 Oct
PDX
Portland
IAD
Washington
£294 Return, found 17 hours ago
£294
Return
found 17 hours ago
Select Alaska Airlines flight, departing Fri, 17 Oct from Portland to Washington, returning Fri, 24 Oct, priced at £294 found 17 hours ago
Alaska Airlines
Wed, 15 Oct - Sat, 18 Oct
PDX
Portland
IAD
Washington
£306 Return, found 2 days ago
£306
Return
found 2 days ago
Select Alaska Airlines flight, departing Wed, 15 Oct from Portland to Washington, returning Sat, 18 Oct, priced at £306 found 2 days ago
Alaska Airlines
Fri, 17 Oct - Fri, 24 Oct
PDX
Portland
IAD
Washington
£306 Return, found 17 hours ago
£306
Return
found 17 hours ago
Select Alaska Airlines flight, departing Fri, 17 Oct from Portland to Washington, returning Fri, 24 Oct, priced at £306 found 17 hours ago
Alaska Airlines
Fri, 17 Oct - Fri, 24 Oct
PDX
Portland
IAD
Washington
£308 Return, found 17 hours ago
£308
Return
found 17 hours ago
Select Alaska Airlines flight, departing Fri, 17 Oct from Portland to Washington, returning Fri, 24 Oct, priced at £308 found 17 hours ago

Find the cheapest month to fly from Portland (PDX) to Washington (IAD)

May is typically the cheapest month to fly

From £154 - £309 per traveller.

Graph displaying average flight prices per month

Flight from Portland to Washington route information
Origin airport
Portland Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
Alaska Airlines
Return price
£234
Distance
3713 km
Average flight time
5 hours 5 mins

Compare flights from Portland to Washington easily and book with confidence

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

The easiest way to view the best deals on flights from Portland to Washington 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 Portland Intl. to Washington Dulles Intl. start at just £234 and range up to £308.  

To find an even better deal, try  

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

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

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Portland Intl. to Washington Dulles 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.  

Frequently asked questions

How much is a flight from PDX to Dulles Intl. Airport?
If you're planning on travelling from Portland Intl. Airport (PDX) to IAD, round-trip flights start from £234. This figure is based on airfares listed within the last 7 days on Expedia for flights departing within the next year, so don't wait around. Book today and save yourself both money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Portland Intl. Airport (PDX) to Dulles Intl. Airport?
This differs between air carriers, as each one has its own set of terms and conditions. Visit the Customer Service Portal, where you'll find instructions on how to cancel your flight online.
How do I find cheap flights from Portland Intl. Airport (PDX) to IAD that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for PDX to IAD flights, you'll see a "no change fees" filter for you to select.
How far is the flight from PDX Airport to Dulles Intl. Airport?
The flying distance from Portland Intl. Airport (PDX) to Dulles Intl. Airport is 3,700 kilometres. Listen to some music or bury your nose in a book and the journey will zip by.
Which airlines fly direct from PDX to Washington Dulles Intl. Airport (IAD)?
If you're looking to fly directly from PDX to Dulles Intl. Airport, United Airlines (UA) is a popular option. It operates 30 flights each month between Portland and Chantilly.
Are Portland Airport to IAD flight tickets cheaper when they're purchased at the last minute?
It is possible to nab a fantastic last-minute deal from PDX Airport to Dulles Intl. Airport, but it's also possible to miss out entirely! As many airlines release seats up to a year in advance, it's worthwhile keeping an eye on fares early and being ready to book when you see a good bargain. Expedia compares air carrier prices and updates flight deals regularly, so you can be certain you're always getting the latest offers.

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