Dulles Intl

$340+ 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 11 — Feb 181
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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 February 6, 2025.

Most accurate provider

Gotogate
3 stars

Most trusted provider

Gotogate
3 stars

Round-trip from

$521
(Gotogate)

One-way from

$340
(Trip.com)

Popular in

June

Cheapest in

February

Average price

$493
Provider with most accurate pricing for Porto-Washington, D.C. Dulles Intl flight deals.
Provider most trusted by Cheapflights users for Porto-Washington, D.C. Dulles Intl flights.
From Porto to Washington, D.C. Dulles Intl
One-way flight from Porto to Washington, D.C. Dulles Intl
Highest demand for flights based on searches. 27% potential increase in price ($274 potential increase over avg. RT price).
Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
Average for round-trip flights in February 2025

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 February 6, 2025.

This Gotogate deal was found by Cheapflights users on 2/4. 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.
Mon 3/107:20 pmOPO - IAD
1 stop26h 05mSWISS
Sun 3/239:45 pmIAD - OPO
1 stop16h 45mSWISS
Deal found 2/4$521
This Expedia deal was found by Cheapflights users on 2/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/2212:40 pmOPO - IAD
1 stop30h 55mMultiple Airlines
Sat 3/298:45 pmIAD - OPO
1 stop16h 45mMultiple Airlines
Deal found 2/5$532
This Lufthansa deal was found by Cheapflights users on 2/5. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/106:00 amOPO - IAD
1 stop14h 50mLufthansa
Sun 4/2011:05 pmIAD - OPO
1 stop19h 15mLufthansa
Deal found 2/5$539
This United Airlines deal was found by Cheapflights users on 2/5. 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.
Wed 5/76:00 amOPO - IAD
1 stop18h 50mUnited Airlines
Tue 5/136:22 amIAD - OPO
2 stops28h 23mUnited Airlines
Deal found 2/5$541
This Gotogate deal was found by Cheapflights users on 2/5. 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.
Mon 3/106:00 amOPO - IAD
2 stops30h 05mAir Canada
Sun 3/2310:35 amIAD - OPO
2 stops20h 40mAir Canada
Deal found 2/5$545
This Gotogate deal was found by Cheapflights users on 2/6. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/88:55 amOPO - IAD
1 stop11h 05mTAP AIR PORTUGAL
Sun 2/2310:30 pmIAD - OPO
1 stop11h 50mTAP AIR PORTUGAL
Deal found 2/6$553
This British Airways deal was found by Cheapflights users on 2/6. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/128:35 pmOPO - IAD
1 stop23h 25mIberia
Sat 4/194:35 pmIAD - OPO
1 stop10h 00mIberia
Deal found 2/6$568
This British Airways deal was found by Cheapflights users on 2/5. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1111:15 amOPO - IAD
1 stop13h 55mBritish Airways
Sun 4/2010:40 pmIAD - OPO
1 stop16h 45mBritish Airways
Deal found 2/5$606
This Delta deal was found by Cheapflights users on 2/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/86:00 amOPO - IAD
2 stops17h 56mDelta
Sun 2/236:30 pmIAD - OPO
1 stop11h 25mDelta
Deal found 2/6$664
This American Airlines deal was found by Cheapflights users on 2/5. 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 4/108:15 amOPO - IAD
2 stops16h 26mAmerican Airlines
Sun 4/204:35 pmIAD - OPO
1 stop18h 20mAmerican Airlines
Deal found 2/5$681
This Gotogate deal was found by Cheapflights users on 2/6. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/305:55 pmOPO - IAD
1 stop31h 04mScandinavian Airlines
Sat 6/2810:05 pmIAD - OPO
1 stop32h 05mScandinavian Airlines
Deal found 2/6$2,598
This KLM deal was found by Cheapflights users on 2/5. 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.
Sat 2/156:00 amOPO - IAD
2 stops15h 15mKLM
Tue 3/46:30 pmIAD - OPO
1 stop11h 05mKLM
Deal found 2/5$3,708

Find flights from Porto to Dulles Intl within your budget

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 6, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 3/10

7:20 pm-5:25 pm

1 stop26h 05m

Washington, D.C. Dulles Intl

Sun 3/23

9:45 pm-6:30 pm

1 stop16h 45m

$521

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 3/22

12:40 pm-3:35 pm

1 stop30h 55m

Washington, D.C. Dulles Intl

Sat 3/29

8:45 pm-5:30 pm

1 stop16h 45m

$532

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 4/10

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Sun 4/20

11:05 pm-11:20 pm

1 stop19h 15m

$539

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 5/7

6:00 am-7:50 pm

1 stop18h 50m

Washington, D.C. Dulles Intl

Tue 5/13

6:22 am-3:45 pm

2 stops28h 23m

$541

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 3/10

6:00 am-8:05 am

2 stops30h 05m

Washington, D.C. Dulles Intl

Sun 3/23

10:35 am-11:15 am

2 stops20h 40m

$545

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 4/12

8:35 pm-3:00 pm

1 stop23h 25m

Washington, D.C. Dulles Intl

Sat 4/19

4:35 pm-7:35 am

1 stop10h 00m

$568

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 4/11

11:15 am-8:10 pm

1 stop13h 55m

Washington, D.C. Dulles Intl

Sun 4/20

10:40 pm-8:25 pm

1 stop16h 45m

$606

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 4/10

8:15 am-7:41 pm

2 stops16h 26m

Washington, D.C. Dulles Intl

Sun 4/20

4:35 pm-3:55 pm

1 stop18h 20m

$681

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 5/6

11:00 am-8:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Fri 5/9

10:20 pm-3:05 pm

1 stop11h 45m

$721

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 4/11

6:40 am-7:41 pm

2 stops18h 01m

Washington, D.C. Dulles Intl

Sun 4/20

1:49 pm-10:40 am

2 stops15h 51m

$2,137

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/5

Showing 1-10 of 19 results
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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 February.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy3 starsTrust Score*3 stars
GurufarePrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*2 stars
Trip.comPrice Accuracy1 starTrust 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 Porto-Washington, D.C. Dulles Intl Airport flights, users find the pricing of Gotogate to be most consistent on Cheapflights vs. Gotogate Users can find the same prices on Porto-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. Gotogate >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 Gotogate the most. Gotogate 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.

Travel insights for flights from Porto to Dulles Intl

Get recent, data-driven insights about flights from Porto to Dulles Intl including ideal travel times, pricing trends, and more.

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 $309). Flying from Porto to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $389). 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 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 February 6, 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.

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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 6, 2025.
To help decide which airline to fly from Porto to Washington, D.C., see what other customers have to say about Delta, SWISS and United Airlines. 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.
8.0
Very good

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

8.0
Very good
8.0
Very good

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception