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Dulles Intl

$131+ Cheap flights from Portland, ME (PWM) to Dulles Intl (IAD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — IAD
Jun 20 — Jun 271
Sat 6/20
Sat 6/27
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to Washington, D.C. Dulles Intl are usually found in September or November, booked 19 days in advance, depart on a Friday or Thursday and return on a Wednesday

Cheap flight deals from Portland to Dulles Intl

Cheapest flights from Portland to Dulles Intl
Explore the most affordable flight options available from Portland to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 21, 2026.

This United Airlines deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/235:30 am
PWM
-
IAD
Nonstop1h 58m
United Airlines
Fri 11/2710:15 pm
IAD
-
PWM
Nonstop1h 44m
United Airlines
Deal found 5/17$263
This United Airlines deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/57:16 pm
PWM
-
IAD
Nonstop1h 58m
United Airlines
Sat 6/1310:10 pm
IAD
-
PWM
Nonstop1h 41m
United Airlines
Deal found 5/18$264
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/126:25 am
PWM
-
IAD
1 stop5h 23m
Delta
Mon 6/157:14 pm
IAD
-
PWM
1 stop5h 38m
Delta
Deal found 5/18$269
This United Airlines deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/36:00 am
PWM
-
IAD
1 stop5h 28m
United Airlines
Mon 7/68:20 am
IAD
-
PWM
Nonstop1h 47m
United Airlines
Deal found 5/18$270
This United Airlines deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/175:15 am
PWM
-
IAD
Nonstop1h 45m
United Airlines
Mon 7/205:42 pm
IAD
-
PWM
1 stop5h 48m
United Airlines
Deal found 5/17$272
This United Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/32:20 pm
PWM
-
IAD
Nonstop2h 10m
United Airlines
Sat 6/610:10 pm
IAD
-
PWM
Nonstop1h 41m
United Airlines
Deal found 5/20$279
This Delta deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/52:38 pm
PWM
-
IAD
1 stop4h 15m
Delta
Sat 6/137:59 pm
IAD
-
PWM
1 stop4h 53m
Delta
Deal found 5/18$284
This United Airlines deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/65:15 am
PWM
-
IAD
Nonstop1h 45m
United Airlines
Mon 6/85:42 pm
IAD
-
PWM
1 stop5h 48m
United Airlines
Deal found 5/17$285
This United Airlines deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:53 pm
PWM
-
IAD
1 stop4h 06m
United Airlines
Sat 8/295:30 pm
IAD
-
PWM
Nonstop1h 47m
United Airlines
Deal found 5/16$290
This United Airlines deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/65:15 am
PWM
-
IAD
Nonstop1h 45m
United Airlines
Sat 8/85:30 pm
IAD
-
PWM
Nonstop1h 57m
United Airlines
Deal found 5/18$291

Find flight deals from Portland to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$264
(United Airlines)

One-way from

$131
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$318

Good round-trip deal

$324 or less

Good one-way deal

$227 or less
Provider with most accurate pricing for Portland-Washington, D.C. Dulles Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Washington, D.C. Dulles Intl flights.
Search Deals
From Portland to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Portland to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($25 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals
Price to beat on a round-trip flight from Portland to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from Portland to Washington, D.C. Dulles Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 21, 2026.
Use the filters below to find and compare flights from Portland to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Wed 6/17

6:25 am-11:48 am

1 stop5h 23m

Washington, D.C. Dulles Intl

Wed 6/24

7:14 pm-12:52 am

1 stop5h 38m

$269

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Fri 7/3

6:00 am-11:28 am

1 stop5h 28m

Washington, D.C. Dulles Intl

Mon 7/6

8:20 am-10:07 am

Nonstop1h 47m

$270

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 6/4

6:25 am-12:18 pm

1 stop5h 53m

Washington, D.C. Dulles Intl

Tue 6/9

11:05 am-3:55 pm

1 stop4h 50m

$284

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 8/6

5:15 am-7:00 am

Nonstop1h 45m

Washington, D.C. Dulles Intl

Sat 8/8

5:30 pm-7:27 pm

Nonstop1h 57m

$291

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Sat 6/6

2:38 pm-6:53 pm

1 stop4h 15m

Washington, D.C. Dulles Intl

Mon 6/8

7:14 pm-12:52 am

1 stop5h 38m

$299

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Fri 6/12

6:25 am-11:48 am

1 stop5h 23m

Washington, D.C. Dulles Intl

Wed 6/17

7:14 pm-12:52 am

1 stop5h 38m

$324

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 6/18

5:15 am-7:00 am

Nonstop1h 45m

Washington, D.C. Dulles Intl

Mon 6/22

5:42 pm-11:30 pm

1 stop5h 48m

$329
Quickest round-trip

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Sun 6/21

5:15 am-7:00 am

Nonstop1h 45m

Washington, D.C. Dulles Intl

Wed 6/24

10:10 pm-11:51 pm

Nonstop1h 41m

$331

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Fri 6/5

7:16 pm-9:14 pm

Nonstop1h 58m

Washington, D.C. Dulles Intl

Sun 6/7

10:10 pm-11:51 pm

Nonstop1h 41m

$334

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 8/20

6:53 pm-10:59 pm

1 stop4h 06m

Washington, D.C. Dulles Intl

Mon 8/24

5:30 pm-7:24 pm

Nonstop1h 54m

$344

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/20

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Portland to Dulles Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Dulles Intl in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Portland, Maine-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland, Maine-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland, Maine-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland, Maine-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland, Maine-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Portland to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Portland with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Portland to Washington, D.C. Dulles Intl Airport

How far ahead should I book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport?

The best time to book flights from Portland, Maine to Washington, D.C. Dulles Intl Airport is 18 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport?

Currently, September is the cheapest month in which you can book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport (average of $260). Flying from Portland, Maine to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $417). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PWM to IAD?

Find hourly flight availability from Portland to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 21, 2026.

A simple way to save on the total cost of your ticket is to fly from Portland, Maine to Washington, D.C. Dulles Intl Airport in the evening. If you’re flexible enough to do this you can expect to save up to 47% on your trip compared to booking a flight in the afternoon.

What is the cheapest day to fly from Portland, Maine to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from Portland to Dulles Intl. Price data was last updated on May 16, 2026.

Travelers seeking maximum savings on their Portland, Maine to Washington, D.C. Dulles Intl Airport flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Portland, Maine to Washington, D.C. Dulles Intl Airport?

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated May 21, 2026.
Read reviews from past customers who have flown United Airlines from Portland to Washington, D.C. Dulles Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,748 reviews

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,748 reviews
United Airlines
7.4
Good
9,748 reviews

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

Related info for your journey

Find useful and relevant information for your journey from Portland to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Portland to Washington, D.C. Dulles Intl?

    Located just 2.9 mi from the city center, Portland is the airport most travelers will use when flying to Washington, D.C. Dulles Intl from Portland. Booking flights from Portland (PWM) to Washington, D.C. Dulles Intl should be relatively easy as there are 4 daily outbound flights to Washington, D.C. Dulles Intl from 1 airline.

  • How long is the flight from Portland, Maine to Washington, D.C. Dulles Intl Airport?

    For as low as $269, Delta can have you in Washington, D.C. Dulles Intl Airport from Portland, Maine in 5h 23m. The distance from Portland, Maine to Washington, D.C. Dulles Intl Airport is about 492 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Portland, Maine to Washington, D.C. Dulles Intl Airport round-trip?

    Cheapflights users have booked flights from Portland, Maine to Washington, D.C. Dulles Intl Airport round-trip from $204. Users have found that United Airlines is 39% cheaper than the other options available to this destination.

  • What are the most reliable airlines from Portland, Maine to Washington, D.C. Dulles Intl Airport?

    Consider Avianca (95%), Copa Airlines (95%) or Republic Airways (95%) when booking your flight. These represent the most reliable airlines when flying from Portland, Maine to Washington, D.C. Dulles Intl Airport.

  • What are the cheapest flights from Portland, Maine to Washington, D.C. Dulles Intl Airport?

    On average you can expect to pay $467 for a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $151 while the most popular route, (Portland - Washington, D.C. Dulles Intl) is currently priced at $249.

  • Can I find deals for flights from Portland to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Portland to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Dulles Intl.

  • Can I find deals for business class flights from Portland to Dulles Intl?

    Yes. Cheapflights offers flight deals from Portland to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport?

    Currently, September is the cheapest month in which you can book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport (average of $260). Flying from Portland, Maine to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $417). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Tysons
Owings Mills
Springfield
Arlington
Herndon
Rockville
Hyattsville
Manassas
Fredericksburg
Hanover
Chantilly
Laurel
Falls Church
Waldorf
Silver Spring
Largo
Clinton
Reston
Hunt Valley

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Top airline flying from Portland to Dulles Intl

Discover the top airline that operate flights from Portland to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$204Average$342FlexibilityNo cancel feeOn-time69%

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