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Dulles Intl

$180+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — IAD
Aug 23 — Aug 301
Sun 8/23
Sun 8/30
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to Washington, D.C. Dulles Intl are usually found in November or February, booked 90 days in advance, depart on a Thursday or Friday and return on a Saturday

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 July 24, 2026.

This United Airlines deal was found by Cheapflights users on 7/22. 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 10/237:25 pm
PWM
-
IAD
Nonstop1h 55m
United Airlines
Mon 10/2610:10 pm
IAD
-
PWM
Nonstop1h 49m
United Airlines
Deal found 7/22$249
This United Airlines deal was found by Cheapflights users on 7/21. 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 9/33:45 pm
PWM
-
IAD
1 stop5h 43m
United Airlines
Sun 9/68:35 am
IAD
-
PWM
1 stop5h 20m
United Airlines
Deal found 7/21$253
This United Airlines deal was found by Cheapflights users on 7/19. 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 10/86:00 am
PWM
-
IAD
1 stop5h 25m
United Airlines
Sun 10/1110:10 pm
IAD
-
PWM
Nonstop1h 49m
United Airlines
Deal found 7/19$254
This Delta deal was found by Cheapflights users on 7/23. 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 8/146:00 am
PWM
-
IAD
1 stop5h 49m
Delta
Mon 8/177:19 pm
IAD
-
PWM
1 stop5h 40m
Delta
Deal found 7/23$258
This American Airlines deal was found by Cheapflights users on 7/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/265:18 pm
PWM
-
IAD
1 stop5h 33m
American Airlines
Mon 9/287:57 am
IAD
-
PWM
1 stop4h 45m
American Airlines
Deal found 7/19$259
This Delta deal was found by Cheapflights users on 7/22. 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 9/114:45 pm
PWM
-
IAD
1 stop6h 29m
Delta
Sun 9/136:26 pm
IAD
-
PWM
1 stop5h 30m
Delta
Deal found 7/22$263
This American Airlines deal was found by Cheapflights users on 7/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/175:18 pm
PWM
-
IAD
1 stop5h 33m
American Airlines
Sun 9/205:01 am
IAD
-
PWM
1 stop6h 15m
American Airlines
Deal found 7/19$264
This United Airlines deal was found by Cheapflights users on 7/23. 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 9/46:53 pm
PWM
-
IAD
1 stop4h 06m
United Airlines
Sat 9/1212:47 pm
IAD
-
PWM
Nonstop1h 51m
United Airlines
Deal found 7/23$265
This Delta deal was found by Cheapflights users on 7/22. 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.
Thu 8/136:00 am
PWM
-
IAD
1 stop5h 49m
Delta
Mon 8/177:19 pm
IAD
-
PWM
1 stop5h 40m
Delta
Deal found 7/22$269
This Delta deal was found by Cheapflights users on 7/23. 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.
Wed 8/126:00 am
PWM
-
IAD
1 stop5h 49m
Delta
Mon 8/177:19 pm
IAD
-
PWM
1 stop5h 40m
Delta
Deal found 7/23$273
This Delta deal was found by Cheapflights users on 7/22. 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 8/146:00 am
PWM
-
IAD
1 stop5h 49m
Delta
Wed 8/197:19 pm
IAD
-
PWM
1 stop5h 40m
Delta
Deal found 7/22$274

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 July 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$249
(United Airlines)

One-way from

$180
(United Airlines)

Popular in

March

Cheapest in

November

Average price

$359

Good round-trip deal

$320 or less

Good one-way deal

$258 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. 5% potential increase in price ($19 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 24, 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 9/9

3:43 pm-9:28 pm

1 stop5h 45m

Washington, D.C. Dulles Intl

Mon 9/14

5:30 pm-7:24 pm

Nonstop1h 54m

$249

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 9/24

7:25 pm-9:20 pm

Nonstop1h 55m

Washington, D.C. Dulles Intl

Sat 9/26

5:30 pm-11:28 pm

1 stop5h 58m

$249

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Fri 10/9

6:04 am-11:50 am

1 stop5h 46m

Washington, D.C. Dulles Intl

Mon 10/12

6:25 pm-12:10 am

1 stop5h 45m

$258

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Sat 8/15

6:00 am-11:49 am

1 stop5h 49m

Washington, D.C. Dulles Intl

Tue 8/18

7:19 pm-12:59 am

1 stop5h 40m

$259

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 9/17

6:06 am-11:26 am

1 stop5h 20m

Washington, D.C. Dulles Intl

Sun 9/20

5:30 pm-7:24 pm

Nonstop1h 54m

$259

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Wed 8/12

11:50 am-6:09 pm

1 stop6h 19m

Washington, D.C. Dulles Intl

Sat 8/15

7:59 pm-12:59 am

1 stop5h 00m

$273

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Tue 10/20

6:04 am-11:50 am

1 stop5h 46m

Washington, D.C. Dulles Intl

Tue 10/27

6:00 am-1:22 pm

2 stops7h 22m

$274

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Fri 1/15

2:35 pm-7:10 pm

1 stop4h 35m

Washington, D.C. Dulles Intl

Mon 1/18

6:10 am-11:53 am

1 stop5h 43m

$279

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Wed 8/12

11:50 am-6:09 pm

1 stop6h 19m

Washington, D.C. Dulles Intl

Sun 8/16

6:10 am-12:02 pm

1 stop5h 52m

$294

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Tue 10/20

6:00 am-11:25 am

1 stop5h 25m

Washington, D.C. Dulles Intl

Tue 10/27

12:47 pm-2:33 pm

Nonstop1h 46m

$297

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/21

Showing 1-10 of 22 resultsSorted by cheapest first
1
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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 July.
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 86 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, November is the cheapest month in which you can book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport (average of $290). Flying from Portland, Maine to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $425). 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 July 24, 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 morning. If you’re flexible enough to do this you can expect to save up to 46% 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 July 18, 2026.

Travelers seeking maximum savings on their Portland, Maine to Washington, D.C. Dulles Intl Airport flight should consider departing on Monday afternoons 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?

Airfare is below average for this route at the moment.

Portland, Maine to Washington, D.C. Dulles Intl Airport flights typically cost between $289 and $566 in October.
The cheapest round-trip price found within the last 5 days was $249 on United Airlines (Oct 23-Oct 26).

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 July 24, 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
10,026 reviews

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
10,026 reviews
United Airlines
7.4
Good
10,026 reviews

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 5 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 $249, United Airlines can have you in Washington, D.C. Dulles Intl Airport from Portland, Maine in 5h 45m. 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 42% 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 United Airlines (92%), Republic Airways (90%) or Avianca (89%) 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 $439 for a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $191 while the most popular route, (Portland - Washington, D.C. Dulles Intl) is currently priced at $217.

  • 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, November is the cheapest month in which you can book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport (average of $290). Flying from Portland, Maine to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $425). 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
Arlington
Owings Mills
Springfield
Lanham
Reston
Herndon
Rockville
Chantilly
Hyattsville
Fredericksburg
Falls Church
Hanover
Manassas
Laurel
Sterling
Clinton
Hunt Valley
Cordova

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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 July 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$204Average$351FlexibilityNo cancel feeOn-time69%

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