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Dulles Intl

$147+ 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 11/11. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — IAD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to Washington, D.C. Dulles Intl are usually found in March or January, booked 49 days in advance, depart on a Friday or Thursday and return on a Tuesday

Cheap 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 September 11, 2025.

Round-trip from

$189
(United Airlines)

One-way from

$147
(United Airlines)

Popular in

April

Cheapest in

March

Average price

$309

Good round-trip deal

$332 or less

Good one-way deal

$202 or less
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. 0% potential increase in price ($0 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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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Find 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 September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/11. 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 10/35:45 amPWM - IAD
Nonstop1h 49mUnited Airlines
Sun 10/58:16 amIAD - PWM
Nonstop1h 43mUnited Airlines
Deal found 9/11$189
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/165:45 amPWM - IAD
Nonstop1h 49mUnited Airlines
Sun 10/198:16 amIAD - PWM
Nonstop1h 43mUnited Airlines
Deal found 9/10$191
This Delta deal was found by Cheapflights users on 9/11. 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 10/26:35 amPWM - IAD
1 stop5h 22mDelta
Sat 10/48:17 pmIAD - PWM
1 stop4h 17mDelta
Deal found 9/11$192
This United Airlines deal was found by Cheapflights users on 9/11. 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 10/165:45 amPWM - IAD
Nonstop1h 49mUnited Airlines
Mon 10/208:30 amIAD - PWM
1 stop5h 23mUnited Airlines
Deal found 9/11$193
This United Airlines deal was found by Cheapflights users on 9/9. 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 11/147:22 pmPWM - IAD
Nonstop1h 56mUnited Airlines
Mon 11/178:20 amIAD - PWM
Nonstop1h 44mUnited Airlines
Deal found 9/9$194
This Delta deal was found by Cheapflights users on 9/10. 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 10/36:35 amPWM - IAD
1 stop5h 21mDelta
Sun 10/127:59 pmIAD - PWM
1 stop4h 06mDelta
Deal found 9/10$198
This United Airlines deal was found by Cheapflights users on 9/11. 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 10/105:41 pmPWM - IAD
1 stop4h 52mUnited Airlines
Sun 10/1210:09 pmIAD - PWM
Nonstop1h 50mUnited Airlines
Deal found 9/11$199
This Delta deal was found by Cheapflights users on 9/11. 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 12/64:53 pmPWM - IAD
1 stop6h 15mDelta
Wed 12/107:59 pmIAD - PWM
1 stop4h 00mDelta
Deal found 9/11$200
This Delta deal was found by Cheapflights users on 9/11. 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 12/54:53 pmPWM - IAD
1 stop6h 15mDelta
Tue 12/97:59 pmIAD - PWM
1 stop4h 00mDelta
Deal found 9/11$202
This United Airlines deal was found by Cheapflights users on 9/11. 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 10/95:41 pmPWM - IAD
1 stop4h 47mUnited Airlines
Sun 10/1210:09 pmIAD - PWM
Nonstop1h 50mUnited Airlines
Deal found 9/11$203
This United Airlines deal was found by Cheapflights users on 9/9. 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 10/175:41 pmPWM - IAD
1 stop4h 52mUnited Airlines
Sun 10/1910:09 pmIAD - PWM
Nonstop1h 50mUnited Airlines
Deal found 9/9$204

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 September 11, 2025.
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

Portland

Fly to

Dulles Intl

Route

Depart

Return

Price

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 10/2

6:35 am-11:57 am

1 stop5h 22m

Washington, D.C. Dulles Intl

Sat 10/4

8:17 pm-12:34 am

1 stop4h 17m

$192

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 1/22

6:30 am-11:53 am

1 stop5h 23m

Washington, D.C. Dulles Intl

Sat 1/24

7:59 pm-11:49 pm

1 stop3h 50m

$192

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Fri 10/17

5:45 am-7:34 am

Nonstop1h 49m

Washington, D.C. Dulles Intl

Sun 10/19

8:16 am-9:59 am

Nonstop1h 43m

$194

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Sat 12/6

4:53 pm-11:08 pm

1 stop6h 15m

Washington, D.C. Dulles Intl

Wed 12/10

7:59 pm-11:59 pm

1 stop4h 00m

$200

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 2/5

5:30 am-12:00 pm

1 stop6h 30m

Washington, D.C. Dulles Intl

Sun 2/8

7:59 pm-11:49 pm

1 stop3h 50m

$206

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Thu 10/23

7:25 pm-9:15 pm

Nonstop1h 50m

Washington, D.C. Dulles Intl

Sun 10/26

8:20 am-10:04 am

Nonstop1h 44m

$207

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Sat 9/27

7:25 pm-9:15 pm

Nonstop1h 50m

Washington, D.C. Dulles Intl

Wed 10/1

5:18 pm-11:13 pm

1 stop5h 55m

$208

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Fri 9/26

3:45 pm-9:11 pm

1 stop5h 26m

Washington, D.C. Dulles Intl

Sun 9/28

8:16 am-9:59 am

Nonstop1h 43m

$209

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Fri 12/5

4:53 pm-11:08 pm

1 stop6h 15m

Washington, D.C. Dulles Intl

Tue 12/9

7:59 pm-11:59 pm

1 stop4h 00m

$209

PortlandWashington, D.C.

PWM - IAD

PWMIAD

Portland

Sat 9/27

6:33 am-11:56 am

1 stop5h 23m

Washington, D.C. Dulles Intl

Wed 10/1

8:17 pm-12:34 am

1 stop4h 17m

$214

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 22 results
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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 August 29, 2025.

The best time to book flights from Portland, Maine to Washington, D.C. Dulles Intl Airport is 49 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, August is the cheapest month in which you can book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport (average of $292). Flying from Portland, Maine to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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 September 11, 2025.

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 36% 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 September 7, 2025.

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.

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 September 11, 2025.
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
8.0
Very good
7,960 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 2 different airlines.

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

    For as low as $194, Delta can have you in Washington, D.C. Dulles Intl Airport from Portland, Maine in 1h 49m. 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 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 GoJet (100%), Avianca (90%) or United Airlines (80%) 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 $740 for a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $143 while the most popular route, (Portland - Washington, D.C. Dulles Intl) is currently priced at $172.

  • 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, August is the cheapest month in which you can book a flight from Portland, Maine to Washington, D.C. Dulles Intl Airport (average of $292). Flying from Portland, Maine to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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
Woodbridge
Alexandria
Arlington
Tysons
Silver Spring
Springfield
Gaithersburg
Fredericksburg
Linthicum Heights
Fairfax
Falls Church
Owings Mills
Manassas
Rockville
Hanover
Oxon Hill
Laurel
Towson
Dundalk
National Harbor

Browse thousands of different options on Cheapflights for your next trip

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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$176Average$248FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$209Average$320FlexibilityNo cancel feeOn-time69%

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