$110 Cheap Flights from Portland (PDX) to Washington (IAD)

View $110 flight on Fri, May 9, 2025Opens in a new window

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 30% on select hotels after you book a flight*
  • one key icon
    Earn twice
    Earn your airline miles on top of our OneKeyCash
    Learn about One Key
Find available prices by choosing your travel dates.

Cheap Flights from Portland to Washington (PDX-IAD)

Prices were available within the past 7 days and start at $110 for one-way flights and $208 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, May 22 - Thu, May 29
PDX
Portland
IAD
Washington
$208 Roundtrip, just found
$208
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, May 22 from Portland to Washington, returning Thu, May 29, priced at $208 just found
Frontier Airlines
Fri, May 9 - Mon, May 12
PDX
Portland
IAD
Washington
$228 Roundtrip, just found
$228
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, May 9 from Portland to Washington, returning Mon, May 12, priced at $228 just found
Frontier Airlines
Sun, May 11 - Sun, May 18
PDX
Portland
IAD
Washington
$230 Roundtrip, found 1 day ago
$230
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sun, May 11 from Portland to Washington, returning Sun, May 18, priced at $230 found 1 day ago
Frontier Airlines
Sun, Jun 1 - Sun, Jun 8
PDX
Portland
IAD
Washington
$248 Roundtrip, found 5 hours ago
$248
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Sun, Jun 1 from Portland to Washington, returning Sun, Jun 8, priced at $248 found 5 hours ago
Frontier Airlines
Fri, May 23 - Fri, May 30
PDX
Portland
IAD
Washington
$260 Roundtrip, found 4 hours ago
$260
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Fri, May 23 from Portland to Washington, returning Fri, May 30, priced at $260 found 4 hours ago
Alaska Airlines
Wed, May 21 - Thu, May 29
PDX
Portland
IAD
Washington
$263 Roundtrip, found 9 hours ago
$263
Roundtrip
found 9 hours ago
Select Alaska Airlines flight, departing Wed, May 21 from Portland to Washington, returning Thu, May 29, priced at $263 found 9 hours ago
Frontier Airlines
Sun, May 25 - Tue, Jun 3
PDX
Portland
IAD
Washington
$269 Roundtrip, found 5 hours ago
$269
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Sun, May 25 from Portland to Washington, returning Tue, Jun 3, priced at $269 found 5 hours ago
United
Wed, Jun 4 - Fri, Jun 6
PDX
Portland
IAD
Washington
$283 Roundtrip, found 17 hours ago
$283
Roundtrip
found 17 hours ago
Select United flight, departing Wed, Jun 4 from Portland to Washington, returning Fri, Jun 6, priced at $283 found 17 hours ago
American Airlines
Sat, May 31 - Mon, Jun 2
PDX
Portland
IAD
Washington
$288 Roundtrip, found 17 hours ago
$288
Roundtrip
found 17 hours ago
Select American Airlines flight, departing Sat, May 31 from Portland to Washington, returning Mon, Jun 2, priced at $288 found 17 hours ago
Delta
Wed, May 21 - Wed, May 28
PDX
Portland
IAD
Washington
$319 Roundtrip, found 4 hours ago
$319
Roundtrip
found 4 hours ago
Select Delta flight, departing Wed, May 21 from Portland to Washington, returning Wed, May 28, priced at $319 found 4 hours ago

Frequently asked questions

How much does a flight from Portland Intl. Airport (PDX) to Washington Dulles Intl. Airport (IAD) cost?
Pick up cheap return fares starting from $357 from Portland Intl. Airport (PDX) to Washington Dulles Intl. Airport (IAD). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a United flight leaving PDX on May 13 2025 and touching down at IAD. The price was last updated on April 22 2025 and has not changed since.
What is the cheapest month to fly from PDX to IAD?
The cheapest flights from PDX to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from PDX to IAD?
At the moment, the cheapest airline operating one-way flights from PDX to IAD is United. You can book a seat on this route from $179. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from PDX on July 18 2025. Prices were last updated on April 22 2025 and have not changed since.
How many flights per day from Portland Intl. Airport (PDX) to Washington Dulles Intl. Airport (IAD)?
You’ll have to hop on a flight with a layover when traveling from Portland Intl. Airport (PDX) to Washington Dulles Intl. Airport (IAD). Direct flights don’t operate daily on this route. However, just filter your search to include one or more stops to find the best option for your trip.
What day of the week has the most flights from PDX to IAD?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can vary based on a range of factors, such as the carrier and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What airline has the least delays from PDX to IAD?
Consider traveling with United Airlines if you’d like to fly straight from Portland Intl. Airport (PDX) to Washington Dulles Intl. Airport (IAD) without any holdups. This airline has the best track record for punctuality, with an on-time performance of 88%. Want to be notified if anything changes? You can check your flight status using the Expedia App.
What is the best time to fly from Portland Intl. Airport (PDX) to Washington Dulles Intl. Airport (IAD)?
To land at Washington Dulles Intl. Airport (IAD) on time, opt for a flight that leaves from Portland Intl. Airport (PDX) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for Washington from Portland Intl. Airport (PDX)?
Compare your flight options from Portland Intl. Airport (PDX) to Ronald Reagan Washington National Airport (DCA). This is the only Washington airport you can arrive at if you’re taking a direct flight.
Is it cheaper to buy a plane ticket from Portland Intl. Airport (PDX) to Washington Dulles Intl. Airport (IAD) last-minute?
Holding off until just before your departure to book your flight from PDX to IAD generally means paying more. While you might find some last-minute offers, there’s no guarantee. Be flexible with your itinerary to boost your chances of scoring a bargain.
Is it cheaper to book a PDX to IAD flight and hotel package?
Compared with arranging hotels and flights separately, booking a PDX to IAD flight and hotel package with Expedia could result in significant savings. Better still, having everything in one easy place takes the hassle out of travel planning. Just pick your flights and choose from our wide range of stays, then personalize your trip with other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Portland Intl. Airport (PDX) to Washington Dulles Intl. Airport (IAD)?
In most cases, you’re able to reschedule or cancel your PDX to IAD flight. However, additional charges may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline’s policies and fees on flight changes, or if you want further information, visit our Customer Service portal.
*Available to One Key members.