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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 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — IAD
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$530
(Iberia)

One-way from

$356
(Kiwi.com)

Popular in

January

Cheapest in

April

Average price

$671
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. 13% potential increase in price ($111 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($47 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 16, 2025.

This Iberia deal was found by Cheapflights users on 9/14. 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.
Thu 10/28:15 amOPO - IAD
1 stop11h 45mIberia
Wed 10/154:35 pmIAD - OPO
1 stop18h 20mIberia
Deal found 9/14$530
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Tue 9/238:15 amOPO - IAD
1 stop11h 45mAmerican Airlines
Sat 10/412:48 pmIAD - OPO
2 stops13h 47mAmerican Airlines
Deal found 9/15$535
This AirNGo deal was found by Cheapflights users on 9/14. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/269:20 amOPO - IAD
1 stop12h 00mKLM
Sat 10/49:20 pmIAD - OPO
1 stop13h 10mKLM
Deal found 9/14$538
This Mytrip deal was found by Cheapflights users on 9/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/27:20 pmOPO - IAD
1 stop25h 55mSWISS
Wed 10/158:45 pmIAD - OPO
1 stop16h 45mSWISS
Deal found 9/15$540
This SWISS deal was found by Cheapflights users on 9/14. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3112:50 pmOPO - IAD
1 stop32h 50mSWISS
Tue 11/115:25 pmIAD - OPO
1 stop12h 50mSWISS
Deal found 9/14$541
This Air France deal was found by Cheapflights users on 9/14. 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.
Sat 11/14:10 pmOPO - IAD
1 stop28h 55mMultiple Airlines
Mon 11/106:50 pmIAD - OPO
1 stop10h 40mMultiple Airlines
Deal found 9/14$542
This Delta deal was found by Cheapflights users on 9/15. 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 9/266:40 amOPO - IAD
1 stop13h 55mDelta
Sat 10/48:17 pmIAD - OPO
2 stops14h 13mDelta
Deal found 9/15$544
This Delta deal was found by Cheapflights users on 9/14. 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 11/16:00 amOPO - IAD
1 stop15h 05mDelta
Tue 11/1111:05 amIAD - OPO
2 stops18h 25mDelta
Deal found 9/14$549
This Delta deal was found by Cheapflights users on 9/15. 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 10/86:15 amOPO - IAD
2 stops18h 03mDelta
Tue 10/217:59 pmIAD - OPO
2 stops14h 31mDelta
Deal found 9/15$550
This KLM deal was found by Cheapflights users on 9/15. 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.
Wed 10/811:35 amOPO - IAD
1 stop33h 00mKLM
Tue 10/215:25 pmIAD - OPO
1 stop12h 15mKLM
Deal found 9/15$551
This KLM deal was found by Cheapflights users on 9/15. 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.
Fri 9/266:40 amOPO - IAD
1 stop13h 55mKLM
Sun 10/55:25 pmIAD - OPO
1 stop23h 50mKLM
Deal found 9/15$552

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 September 16, 2025.
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

Thu 10/2

8:15 am-3:00 pm

1 stop11h 45m

Washington, D.C. Dulles Intl

Wed 10/15

4:35 pm-7:35 am

1 stop10h 00m

$530

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 10/2

8:15 am-3:00 pm

1 stop11h 45m

Washington, D.C. Dulles Intl

Wed 10/15

4:35 pm-3:55 pm

1 stop18h 20m

$530

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 9/26

9:20 am-4:20 pm

1 stop12h 00m

Washington, D.C. Dulles Intl

Sat 10/4

9:20 pm-3:30 pm

1 stop13h 10m

$538

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 10/31

12:50 pm-5:40 pm

1 stop32h 50m

Washington, D.C. Dulles Intl

Tue 11/11

5:25 pm-11:15 am

1 stop12h 50m

$541

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/8

6:15 am-3:35 pm

1 stop14h 20m

Washington, D.C. Dulles Intl

Tue 10/21

7:59 pm-3:30 pm

2 stops14h 31m

$544

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 11/1

9:40 am-5:40 pm

1 stop36h 00m

Washington, D.C. Dulles Intl

Mon 11/10

5:25 pm-11:15 am

1 stop12h 50m

$544

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/15

6:15 am-3:35 pm

1 stop14h 20m

Washington, D.C. Dulles Intl

Mon 10/20

7:59 pm-3:30 pm

2 stops14h 31m

$544

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 10/30

7:25 pm-3:35 pm

1 stop24h 10m

Washington, D.C. Dulles Intl

Sun 11/9

5:25 pm-11:10 am

1 stop12h 45m

$544

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 11/1

9:40 am-5:40 pm

1 stop36h 00m

Washington, D.C. Dulles Intl

Tue 11/11

5:25 pm-11:15 am

1 stop12h 50m

$544

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 11/19

1:55 pm-3:15 pm

2 stops30h 20m

$356

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 19 results
1
2

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.

Cheapflights Insights

Everything you need to know about your flight from Porto to Washington, D.C. Dulles Intl Airport

What is the cheapest time of day to fly from OPO to IAD?

Find hourly flight availability from Porto 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 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Porto to Washington, D.C. Dulles Intl Airport as you normally would.

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 16, 2025.
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
1,975 reviews

Food

6.2

Comfort

7.1

Entertainment

6.3

Boarding

7.0

Overall

7.1

Crew

7.8

Reviews

1 / 20
6.0
Good

Delsy,Aug 2025

LIS - MIA

Boarding was a hassle. When I asked if my flight class had been assigned, the staff treated me poorly. The seats were small and very hard, and the temperature was extremely hot for about half of the flight. The food was good, but there wasn't enough chicken for the entire plane, so I only received pasta with no other options. The flight attendants were not friendly at all. Overall, for a group of 24 people, it was a very unpleasant experience.
TAP AIR PORTUGAL
7.1
Good
1,975 reviews
TAP AIR PORTUGAL
7.1
Good
1,975 reviews

Food

6.2

Comfort

7.1

Entertainment

6.3

Boarding

7.0

Overall

7.1

Crew

7.8

Reviews

1 / 20
6.0
Good

Delsy,Aug 2025

LIS - MIA

Boarding was a hassle. When I asked if my flight class had been assigned, the staff treated me poorly. The seats were small and very hard, and the temperature was extremely hot for about half of the flight. The food was good, but there wasn't enough chicken for the entire plane, so I only received pasta with no other options. The flight attendants were not friendly at all. Overall, for a group of 24 people, it was a very unpleasant experience.

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?

    American Airlines, Iberia, and Air France can get you from Porto to Washington, D.C. Dulles Intl Airport in just under 11h 45m. Your travel time can differ by up to 15m. Porto and Washington, D.C. Dulles Intl Airport are separated by a distance of 3537 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    TAP AIR PORTUGAL, at $480, was found to be the cheapest airline from Porto to Washington, D.C. Dulles Intl Airport.. TAP AIR PORTUGAL is priced at 35% lower than the current average price of a flight leaving 3 months from now.

  • 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.

  • What is the cheapest month to book a flight from Porto to Washington, D.C. Dulles Intl Airport?

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

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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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$480Average$841FlexibilityNo cancel feeOn-timeN/A

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