HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Dulles Intl

$359+ 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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — IAD
Mar 6 — Mar 131
Fri 3/6
Fri 3/13
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Porto to Dulles Intl with Cheapflights

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.

Cheap 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 February 4, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/67:20 pm
OPO
-
IAD
1 stop25h 00m
SWISS
Mon 5/258:20 pm
IAD
-
OPO
1 stop30h 35m
SWISS
Deal found 2/2$472
This oojo deal was found by Cheapflights users on 2/3. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/219:00 am
OPO
-
IAD
1 stop11h 05m
TAP AIR PORTUGAL
Wed 4/2910:35 pm
IAD
-
OPO
1 stop19h 35m
TAP AIR PORTUGAL
Deal found 2/3$504
This oojo deal was found by Cheapflights users on 2/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/28:00 pm
OPO
-
IAD
1 stop23h 35m
TAP AIR PORTUGAL
Mon 3/96:30 pm
IAD
-
OPO
1 stop16h 30m
TAP AIR PORTUGAL
Deal found 2/2$509
This Rumbo deal was found by Cheapflights users on 2/2. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/57:00 am
OPO
-
IAD
1 stop13h 15m
TAP AIR PORTUGAL
Wed 2/1810:30 pm
IAD
-
OPO
1 stop9h 35m
TAP AIR PORTUGAL
Deal found 2/2$515
This Delta deal was found by Cheapflights users on 2/2. 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.
Mon 3/25:00 am
OPO
-
IAD
1 stop16h 05m
Delta
Mon 3/91:19 pm
IAD
-
OPO
2 stops17h 11m
Delta
Deal found 2/2$570
This Delta deal was found by Cheapflights users on 2/2. 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.
Mon 5/45:00 am
OPO
-
IAD
1 stop15h 35m
Delta
Mon 5/116:10 pm
IAD
-
OPO
1 stop11h 30m
Delta
Deal found 2/2$576
This KLM deal was found by Cheapflights users on 2/2. 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.
Tue 5/54:20 pm
OPO
-
IAD
1 stop28h 15m
KLM
Mon 5/116:10 pm
IAD
-
OPO
1 stop16h 20m
KLM
Deal found 2/2$582
This Delta deal was found by Cheapflights users on 2/3. 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 4/216:15 am
OPO
-
IAD
2 stops21h 48m
Delta
Wed 4/299:45 pm
IAD
-
OPO
1 stop19h 15m
Delta
Deal found 2/3$583
This KLM deal was found by Cheapflights users on 2/2. 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.
Thu 4/25:00 am
OPO
-
IAD
1 stop15h 35m
KLM
Sat 4/119:45 pm
IAD
-
OPO
1 stop19h 15m
KLM
Deal found 2/2$586
This Gotogate deal was found by Cheapflights users on 2/2. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:00 am
OPO
-
IAD
1 stop14h 50m
Multiple Airlines
Sun 5/248:20 pm
IAD
-
OPO
1 stop34h 05m
Multiple Airlines
Deal found 2/2$594
This Gotogate deal was found by Cheapflights users on 2/2. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:00 am
OPO
-
IAD
1 stop14h 50m
Multiple Airlines
Tue 5/268:20 pm
IAD
-
OPO
1 stop30h 35m
Multiple Airlines
Deal found 2/2$595

Find 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 February 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$472
(Kiwi.com)

One-way from

$359
(Kiwi.com)

Popular in

January

Cheapest in

March

Average price

$692
Provider with most accurate pricing for Porto-Washington, D.C. Dulles Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Porto-Washington, D.C. Dulles Intl flights.
Search Deals
From Porto to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Porto to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($167 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($45 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 4, 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

Mon 5/4

5:00 am-3:35 pm

1 stop15h 35m

Washington, D.C. Dulles Intl

Mon 5/11

6:10 pm-10:40 am

1 stop11h 30m

$576

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 4/21

6:15 am-11:03 pm

2 stops21h 48m

Washington, D.C. Dulles Intl

Wed 4/29

9:45 pm-10:00 pm

1 stop19h 15m

$583

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 4/2

5:00 am-3:35 pm

1 stop15h 35m

Washington, D.C. Dulles Intl

Sat 4/11

9:45 pm-10:00 pm

1 stop19h 15m

$586

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 4/16

6:00 am-7:55 pm

1 stop18h 55m

Washington, D.C. Dulles Intl

Sun 4/19

5:55 pm-11:15 am

1 stop12h 20m

$599

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 3/2

12:30 pm-11:21 pm

2 stops15h 51m

Washington, D.C. Dulles Intl

Mon 3/9

5:35 pm-9:30 am

1 stop11h 55m

$601

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 5/5

8:40 am-4:45 pm

1 stop13h 05m

Washington, D.C. Dulles Intl

Wed 5/13

8:20 pm-7:55 am

1 stop30h 35m

$604

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

$628

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 5/4

7:00 pm-3:35 pm

1 stop25h 35m

Washington, D.C. Dulles Intl

Tue 5/12

9:45 pm-10:05 pm

1 stop19h 20m

$628

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 5/6

5:00 am-3:35 pm

1 stop15h 35m

Washington, D.C. Dulles Intl

Sun 5/10

9:45 pm-10:00 pm

1 stop19h 15m

$629

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 5/8

11:25 am-3:35 pm

1 stop33h 10m

Washington, D.C. Dulles Intl

Sun 5/10

9:45 pm-10:00 pm

1 stop19h 15m

$629

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

Showing 1-10 of 21 results
1
2
3
  • Most accurate provider: When it comes to deals on Porto-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 Porto-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >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 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 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.

Cheapflights Insights

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

How much does it cost to fly round-trip from Porto 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 February 4, 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
2,133 reviews

Comfort

7.1

Entertainment

6.3

Food

6.2

Crew

7.8

Overall

7.1

Boarding

7.0

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
2,133 reviews
TAP AIR PORTUGAL
7.1
Good
2,133 reviews

Comfort

7.1

Entertainment

6.3

Food

6.2

Crew

7.8

Overall

7.1

Boarding

7.0

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, KLM, and United Airlines can get you from Porto to Washington, D.C. Dulles Intl Airport in just under 15h 35m. Your travel time can differ by up to 3h 20m. 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 $492, was found to be the cheapest airline from Porto to Washington, D.C. Dulles Intl Airport.. TAP AIR PORTUGAL is priced at 31% 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.

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
Herndon
Fredericksburg
Hanover
Linthicum Heights
Rockville
Laurel
Towson
Upper Marlboro
Manassas
Largo
Bowie
McLean
Clinton

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 February 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$492Average$751FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2026 Cheapflights