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Dulles Intl

$108+ 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 4/21. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — IAD
Apr 25 — May 21
Sat 4/25
Sat 5/2
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 78 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 March 26, 2026.

This Delta deal was found by Cheapflights users on 3/25. 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 4/156:30 am
PWM
-
IAD
1 stop5h 35m
Delta
Wed 4/296:50 pm
IAD
-
PWM
1 stop5h 56m
Delta
Deal found 3/25$235
This United Airlines deal was found by Cheapflights users on 3/25. 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 4/157:12 pm
PWM
-
IAD
1 stop4h 13m
United Airlines
Sun 5/310:10 pm
IAD
-
PWM
Nonstop1h 49m
United Airlines
Deal found 3/25$242
This United Airlines deal was found by Cheapflights users on 3/22. 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 5/295:15 am
PWM
-
IAD
Nonstop1h 45m
United Airlines
Sun 5/3110:10 pm
IAD
-
PWM
Nonstop1h 41m
United Airlines
Deal found 3/22$249
This Delta deal was found by Cheapflights users on 3/25. 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 5/76:25 am
PWM
-
IAD
1 stop5h 53m
Delta
Tue 5/127:33 pm
IAD
-
PWM
1 stop5h 10m
Delta
Deal found 3/25$252
This United Airlines deal was found by Cheapflights users on 3/22. 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 5/296:00 am
PWM
-
IAD
1 stop5h 28m
United Airlines
Tue 6/210:10 pm
IAD
-
PWM
Nonstop1h 41m
United Airlines
Deal found 3/22$259
This Delta deal was found by Cheapflights users on 3/25. 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 5/66:00 am
PWM
-
IAD
2 stops10h 15m
Delta
Sat 5/95:21 pm
IAD
-
PWM
2 stops7h 22m
Delta
Deal found 3/25$262
This United Airlines deal was found by Cheapflights users on 3/24. 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 4/2310:00 am
PWM
-
IAD
Nonstop1h 54m
United Airlines
Thu 4/308:30 am
IAD
-
PWM
Nonstop1h 48m
United Airlines
Deal found 3/24$263
This United Airlines deal was found by Cheapflights users on 3/25. 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 4/117:36 pm
PWM
-
IAD
Nonstop1h 59m
United Airlines
Sun 5/38:30 am
IAD
-
PWM
Nonstop1h 48m
United Airlines
Deal found 3/25$264
This Delta deal was found by Cheapflights users on 3/25. 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.
Sat 4/114:48 pm
PWM
-
IAD
1 stop6h 11m
Delta
Wed 4/296:50 pm
IAD
-
PWM
1 stop5h 56m
Delta
Deal found 3/25$267
This Delta deal was found by Cheapflights users on 3/25. 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 5/72:38 pm
PWM
-
IAD
1 stop4h 15m
Delta
Mon 5/116:00 am
IAD
-
PWM
1 stop6h 00m
Delta
Deal found 3/25$269
This United Airlines deal was found by Cheapflights users on 3/21. 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 6/116:00 am
PWM
-
IAD
1 stop5h 28m
United Airlines
Tue 6/2310:10 pm
IAD
-
PWM
Nonstop1h 41m
United Airlines
Deal found 3/21$272

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 March 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$242
(United Airlines)

One-way from

$108
(United Airlines)

Popular in

December

Cheapest in

September

Average price

$336

Good round-trip deal

$327 or less

Good one-way deal

$222 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. 4% potential increase in price ($16 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 March 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 March 26, 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 4/15

6:30 am-12:05 pm

1 stop5h 35m

Washington, D.C. Dulles Intl

Wed 4/29

6:50 pm-12:46 am

1 stop5h 56m

$235

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Fri 5/15

5:30 am-7:22 am

Nonstop1h 52m

Washington, D.C. Dulles Intl

Sun 5/17

8:30 am-10:18 am

Nonstop1h 48m

$249

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Wed 4/22

7:33 pm-9:29 pm

Nonstop1h 56m

Washington, D.C. Dulles Intl

Mon 6/1

8:20 am-10:07 am

Nonstop1h 47m

$249
Quickest round-trip

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 6/4

9:55 am-11:46 am

Nonstop1h 51m

Washington, D.C. Dulles Intl

Mon 6/8

10:10 pm-11:51 pm

Nonstop1h 41m

$249

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 4/30

7:10 pm-9:11 pm

Nonstop2h 01m

Washington, D.C. Dulles Intl

Mon 5/4

5:42 pm-11:29 pm

1 stop5h 47m

$259

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Wed 4/15

7:33 pm-9:29 pm

Nonstop1h 56m

Washington, D.C. Dulles Intl

Sun 5/3

8:30 am-10:18 am

Nonstop1h 48m

$264

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Sat 5/2

9:20 am-11:09 am

Nonstop1h 49m

Washington, D.C. Dulles Intl

Sat 5/9

10:10 pm-11:59 pm

Nonstop1h 49m

$292

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Wed 6/3

6:25 am-12:18 pm

1 stop5h 53m

Washington, D.C. Dulles Intl

Sat 6/6

7:33 pm-12:43 am

1 stop5h 10m

$297

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Wed 5/27

6:02 am-4:31 pm

2 stops10h 29m

Washington, D.C. Dulles Intl

Fri 5/29

7:33 pm-12:43 am

1 stop5h 10m

$302

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Sat 4/11

6:25 am-12:39 pm

1 stop6h 14m

Washington, D.C. Dulles Intl

Wed 4/29

5:07 pm-12:46 am

2 stops7h 39m

$317

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

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 March.
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?

Use this chart to determine the optimal time to book a round-trip flight from Portland to Dulles Intl. Price data was last updated on March 13, 2026.

The best time to book flights from Portland, Maine to Washington, D.C. Dulles Intl Airport is 75 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, May is the cheapest month in which you can book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport (average of $135). Flying from Portland, Maine to Washington, D.C. Dulles Intl Airport in August is currently the most expensive (average of $193). 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 March 26, 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 27% on your trip compared to booking a flight at noon.

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 March 23, 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 March 26, 2026.
Read reviews from past customers who have flown Delta and 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.
Delta
7.9
Good
8,331 reviews

Crew

8.5

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Overall

7.9

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,331 reviews
Delta
7.9
Good
8,331 reviews

Crew

8.5

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Overall

7.9

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,484 reviews
Delta
7.9
Good
8,331 reviews

Crew

8.5

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Overall

7.9

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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 3 daily outbound flights to Washington, D.C. Dulles Intl from 2 different airlines.

  • 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 1h 52m. The distance from Portland, Maine to Washington, D.C. Dulles Intl Airport is about 492 mi. All flights are typically nonstop.

  • What are the cheapest airlines flying 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 $176. Another airline that can offer you cheap pricing is United Airlines. Users have found that Delta is 45% 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 Republic Airways (100%), CommutAir (90%) or United Airlines (87%) 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 $396 for a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $159 while the most popular route, (Portland - Washington, D.C. Dulles Intl) is currently priced at $232.

  • 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, May is the cheapest month in which you can book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport (average of $135). Flying from Portland, Maine to Washington, D.C. Dulles Intl Airport in August is currently the most expensive (average of $193). 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
Woodbridge
Tysons
Owings Mills
Arlington
Springfield
Silver Spring
Herndon
Hyattsville
Hanover
Laurel
Rockville
Upper Marlboro
Fredericksburg
Largo
Bowie
Clinton
Towson
College Park
Cordova

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Top 2 airlines flying from Portland to Dulles Intl

Discover the top 2 airlines 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 March 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$176Average$258FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$202Average$333FlexibilityNo cancel feeOn-time69%

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