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Dulles Intl

$356+ Cheap flights from Porto (OPO) 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 6/12. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — IAD
Feb 8 — Feb 151
Sun 2/8
Sun 2/15
1 adult, Economy
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Cheap flight deals from Porto to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Porto (OPO) 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 January 9, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$513
(Travelocity)

One-way from

$356
(American Airlines)

Popular in

August

Cheapest in

June

Average price

$574
Provider with most accurate pricing for Porto-Washington, D.C. Dulles Intl flight deals.
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Provider most trusted by Cheapflights users for Porto-Washington, D.C. Dulles Intl flights.
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From Porto to Washington, D.C. Dulles Intl
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One-way flight from Porto to Washington, D.C. Dulles Intl
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Highest demand for flights based on searches. 5% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find flight deals from Porto to Dulles Intl

Cheapest flights from Porto to Dulles Intl
Explore the most affordable flight options available from Porto to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 9, 2026.

This Travelocity deal was found by Cheapflights users on 1/7. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/68:20 amOPO - IAD
1 stop12h 10mMultiple Airlines
Wed 5/137:15 pmIAD - OPO
1 stop18h 50mMultiple Airlines
Deal found 1/7$513
This Air France deal was found by Cheapflights users on 1/7. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/57:00 pmOPO - IAD
1 stop25h 35mMultiple Airlines
Tue 5/129:45 pmIAD - OPO
1 stop19h 20mMultiple Airlines
Deal found 1/7$515
This KLM deal was found by Cheapflights users on 1/8. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/224:10 pmOPO - IAD
1 stop28h 55mKLM
Sun 3/16:50 pmIAD - OPO
1 stop10h 40mKLM
Deal found 1/8$516
This Delta deal was found by Cheapflights users on 1/7. 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.
Tue 2/35:00 amOPO - IAD
1 stop16h 05mDelta
Tue 2/1012:23 pmIAD - OPO
2 stops17h 07mDelta
Deal found 1/7$517
This Delta deal was found by Cheapflights users on 1/7. 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 9/35:00 amOPO - IAD
2 stops19h 16mDelta
Tue 9/86:15 pmIAD - OPO
1 stop16h 10mDelta
Deal found 1/7$521
This American Airlines deal was found by Cheapflights users on 1/6. 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 4/168:20 amOPO - IAD
2 stops36h 30mAmerican Airlines
Sun 4/1910:25 pmIAD - OPO
2 stops16h 35mAmerican Airlines
Deal found 1/6$523
This American Airlines deal was found by Cheapflights users on 1/8. 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.
Mon 6/158:20 amOPO - IAD
1 stop12h 10mAmerican Airlines
Sun 7/195:00 pmIAD - OPO
1 stop13h 45mAmerican Airlines
Deal found 1/8$530
This Iberia deal was found by Cheapflights users on 1/7. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/158:20 amOPO - IAD
1 stop12h 10mIberia
Sun 7/195:00 pmIAD - OPO
1 stop18h 00mIberia
Deal found 1/7$531

Cheapflights Fare Finder

 
Customize your flight search to find flights from Porto 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 January 9, 2026.
Use the filters below to find and compare flights from Porto to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Porto

Fly to

Dulles Intl

Route

Depart

Return

Price

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 5/6

5:00 am-3:35 pm

1 stop15h 35m

Washington, D.C. Dulles Intl

Tue 5/12

9:45 pm-10:05 pm

1 stop19h 20m

$515

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 2/7

5:00 am-4:05 pm

1 stop16h 05m

Washington, D.C. Dulles Intl

Sat 2/14

6:50 pm-10:30 am

1 stop10h 40m

$515

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 2/22

4:10 pm-4:05 pm

1 stop28h 55m

Washington, D.C. Dulles Intl

Sun 3/1

6:50 pm-10:30 am

1 stop10h 40m

$516

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 2/3

5:00 am-4:05 pm

1 stop16h 05m

Washington, D.C. Dulles Intl

Tue 2/10

12:23 pm-10:30 am

2 stops17h 07m

$517

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 4/16

12:25 pm-3:30 pm

1 stop32h 05m

Washington, D.C. Dulles Intl

Sun 4/19

7:15 pm-8:00 pm

2 stops19h 45m

$528

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 2/1

8:20 am-4:30 pm

1 stop13h 10m

Washington, D.C. Dulles Intl

Sun 2/8

6:00 pm-4:00 pm

1 stop17h 00m

$530

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 6/15

8:20 am-3:30 pm

1 stop12h 10m

Washington, D.C. Dulles Intl

Sun 7/19

5:00 am-7:40 am

2 stops21h 40m

$530

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 6/15

8:20 am-3:30 pm

1 stop12h 10m

Washington, D.C. Dulles Intl

Sun 7/19

5:00 pm-4:00 pm

1 stop18h 00m

$531

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 6/12

8:20 am-3:30 pm

1 stop12h 10m

$356

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 5/26

8:20 am-3:30 pm

1 stop12h 10m

$357

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/8

Showing 1-10 of 18 results
1
2

Compare providers for flights from Porto 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 Porto to Dulles Intl in January.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*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 Porto-Washington, D.C. Dulles Intl Airport flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Porto-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Porto-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 Porto-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust eDreams the most. eDreams 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 Porto-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 Porto to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Porto 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.

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 January 9, 2026.
Get a feel of what it's like to fly with TAP AIR PORTUGAL from Porto to Washington, D.C. Dulles Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
TAP AIR PORTUGAL
7.1
Good
2,111 reviews

Comfort

7.1

Overall

7.1

Boarding

7.0

Entertainment

6.3

Food

6.2

Crew

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

LIS - EWR

Both flights returning to newirk airport was delayed by over a hour with minimum early notification
TAP AIR PORTUGAL
7.1
Good
2,111 reviews
TAP AIR PORTUGAL
7.1
Good
2,111 reviews

Comfort

7.1

Overall

7.1

Boarding

7.0

Entertainment

6.3

Food

6.2

Crew

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

LIS - EWR

Both flights returning to newirk airport was delayed by over a hour with minimum early notification

Related info for your journey

Find useful and relevant information for your journey from Porto 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 Porto to Washington, D.C. Dulles Intl?

    Porto (OPO), located 6.8 mi from the city center, is the airport you fly out of when you book flights from Porto to Washington, D.C. Dulles Intl. 1 airline have flights from Porto to Washington, D.C. Dulles Intl on a regular basis. Booking flights from Porto to Washington, D.C. Dulles Intl should not be difficult; the airport handles an average of 0 outbound flights to Washington, D.C. Dulles Intl per day.

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

    Delta can get you from Porto to Washington, D.C. Dulles Intl Airport in just under 16h 05m. Your travel time can differ by up to . Porto and Washington, D.C. Dulles Intl Airport are separated by a distance of 3537 mi.

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

    TAP AIR PORTUGAL, at $492, was found to be the cheapest airline from Porto to Washington, D.C. Dulles Intl Airport..

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Porto 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.

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
Arlington
Owings Mills
Springfield
Silver Spring
Hanover
Fredericksburg
Linthicum Heights
Rockville
Laurel
Towson
Manassas
National Harbor
Bowie
Largo
McLean
Clinton
Upper Marlboro

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Alternative routes for Porto to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Lisbon to Dulles Intl flights
Lisbon to Baltimore flights
Lisbon to Reagan-National flights
Porto to Reagan-National flights
Porto to Baltimore flights

Top airline flying from Porto to Dulles Intl

Discover the top airline that operate flights from Porto 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 January 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$492Average$804FlexibilityNo cancel feeOn-timeN/A

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