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Dulles Intl

$154+ Cheap flights from Portland, ME (PWM) to Dulles Intl (IAD)

PWM — IAD
Sep 18 — Sep 251
Fri 9/18
Fri 9/25
1 adult, Economy
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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Portland to Washington, D.C. Dulles Intl are usually found in September 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

Sat 9/125:15 am -
Nonstop1h 52m
Mon 9/1410:10 pm -
Nonstop1h 49m
Deal found 8/18$259
Thu 10/19:50 am -
Nonstop1h 52m
Sat 10/35:30 pm -
Nonstop1h 54m
Deal found 8/19$266
Fri 10/95:15 am -
Nonstop1h 52m
Mon 10/1210:10 pm -
Nonstop1h 49m
Deal found 8/18$270
Fri 9/45:15 am -
Nonstop1h 52m
Mon 9/78:20 am -
Nonstop1h 44m
Deal found 8/15$274
Fri 9/114:45 pm -
1 stop6h 29m
Sun 9/136:26 pm -
1 stop5h 30m
Deal found 8/18$279
Thu 12/106:00 am -
1 stop5h 52m
Tue 12/156:00 am -
2 stops10h 45m
Deal found 8/19$284
Wed 11/45:30 am -
Nonstop2h 00m
Sun 11/810:13 pm -
Nonstop1h 46m
Deal found 8/16$287
Thu 9/245:18 pm -
1 stop5h 33m
Sat 9/2610:25 am -
1 stop5h 49m
Deal found 8/17$288

Find flight deals from Portland to Dulles Intl

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$259
(United Airlines)

One-way from

$154
(Delta)

Popular in

March

Cheapest in

September

Average price

$339

Good round-trip deal

$353 or less

Good one-way deal

$289 or less
Provider with most accurate pricing for Portland-Washington, D.C. Dulles Intl flight deals.
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Provider most trusted by Cheapflights users for Portland-Washington, D.C. Dulles Intl flights.
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From Portland to Washington, D.C. Dulles Intl
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One-way flight from Portland to Washington, D.C. Dulles Intl
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Highest demand for flights based on searches. 7% potential increase in price ($26 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in August 2026
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Price to beat on a round-trip flight from Portland to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from Portland to Washington, D.C. Dulles Intl.
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Cheapflights Fare Finder

 
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 Portland - IAD Washington, D.C. Dulles Intl

PWMIAD

Portland

Thu 10/22

7:25 pm-9:20 pm

Nonstop1h 55m

Washington, D.C. Dulles Intl

Sun 10/25

10:13 pm-11:59 pm

Nonstop1h 46m

$259

PortlandWashington, D.C.

PWM Portland - IAD Washington, D.C. Dulles Intl

PWMIAD

Portland

Sat 9/12

5:15 am-7:07 am

Nonstop1h 52m

Washington, D.C. Dulles Intl

Mon 9/14

10:10 pm-11:59 pm

Nonstop1h 49m

$259

PortlandWashington, D.C.

PWM Portland - IAD Washington, D.C. Dulles Intl

PWMIAD

Portland

Tue 9/22

5:15 am-7:07 am

Nonstop1h 52m

Washington, D.C. Dulles Intl

Sat 9/26

10:10 pm-11:59 pm

Nonstop1h 49m

$259

PortlandWashington, D.C.

PWM Portland - IAD Washington, D.C. Dulles Intl

PWMIAD

Portland

Thu 9/17

7:35 pm-9:30 pm

Nonstop1h 55m

Washington, D.C. Dulles Intl

Sun 9/20

5:30 pm-7:24 pm

Nonstop1h 54m

$259
Quickest round-trip

PortlandWashington, D.C.

PWM Portland - IAD Washington, D.C. Dulles Intl

PWMIAD

Portland

Wed 9/2

7:35 pm-9:30 pm

Nonstop1h 55m

Washington, D.C. Dulles Intl

Sun 9/6

8:20 am-10:04 am

Nonstop1h 44m

$274

PortlandWashington, D.C.

PWM Portland - IAD Washington, D.C. Dulles Intl

PWMIAD

Portland

Sat 9/12

6:02 am-11:45 am

1 stop5h 43m

Washington, D.C. Dulles Intl

Mon 9/14

6:26 pm-11:56 pm

1 stop5h 30m

$279

PortlandWashington, D.C.

PWM Portland - IAD Washington, D.C. Dulles Intl

PWMIAD

Portland

Sat 9/12

6:02 am-11:45 am

1 stop5h 43m

Washington, D.C. Dulles Intl

Sun 9/13

6:26 pm-11:56 pm

1 stop5h 30m

$279

PortlandWashington, D.C.

PWM Portland - IAD Washington, D.C. Dulles Intl

PWMIAD

Portland

Thu 9/10

2:38 pm-4:35 pm

Nonstop1h 57m

Washington, D.C. Dulles Intl

Sun 9/13

5:30 pm-7:24 pm

Nonstop1h 54m

$318

PortlandWashington, D.C.

PWM Portland - IAD Washington, D.C. Dulles Intl

PWMIAD

Portland

Sat 8/29

5:15 am-7:07 am

Nonstop1h 52m

Washington, D.C. Dulles Intl

Sun 8/30

10:10 pm-11:59 pm

Nonstop1h 49m

$319

PortlandWashington, D.C.

PWM Portland - IAD Washington, D.C. Dulles Intl

PWMIAD

Portland

Fri 9/18

5:15 am-7:07 am

Nonstop1h 52m

Washington, D.C. Dulles Intl

Mon 9/21

12:47 pm-2:38 pm

Nonstop1h 51m

$329

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 19 resultsSorted by cheapest first
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Compare providers for flights from Portland to Dulles Intl

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 August.
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

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, September is the cheapest month in which you can book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport (average of $261). 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?

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 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?

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?

Airfare is below average for this route at the moment.

Portland, Maine to Washington, D.C. Dulles Intl Airport flights typically cost between $294 and $374 in September.
The cheapest round-trip price found within the last 5 days was $259 on United Airlines (Sep 12-Sep 14).

Reviews of airlines servicing Dulles Intl

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
10,104 reviews

Food

6.7

Entertainment

7.1

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

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
10,104 reviews
United Airlines
7.4
Good
10,104 reviews

Food

6.7

Entertainment

7.1

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

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

  • 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 $259, United Airlines can have you in Washington, D.C. Dulles Intl Airport from Portland, Maine in 1h 55m. The distance from Portland, Maine to Washington, D.C. Dulles Intl Airport is about 492 mi. All flights are typically nonstop.

  • 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 40% 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 (84%), Avianca (79%) or Copa Airlines (79%) 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 $1,371 for a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $213 while the most popular route, (Portland - Washington, D.C. Dulles Intl) is currently priced at $259.

  • 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 $261). 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
Owings Mills
Arlington
Tysons
Lanham
Reston
Herndon
Rockville
Chantilly
Hyattsville
Fredericksburg
Falls Church
Sterling
Hanover
Laurel
Springfield
Oxon Hill
Clinton
Hunt Valley
Woodbridge

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Portland to Dulles Intl

AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$204Average$342FlexibilityNo cancel feeOn-time69%

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