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Dulles Intl

$319+ 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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — IAD
ago. 23 — ago. 301
sáb. 8/23
sáb. 8/30
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 agosto 18, 2025.

Round-trip from

$493
(Vliegwinkel)

One-way from

$319
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$646
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. 10% potential increase in price ($81 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in August 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 agosto 18, 2025.

This Vliegwinkel deal was found by Cheapflights users on 8/16. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/1010:25 pmOPO - IAD
1 stop21h 55mTAP AIR PORTUGAL
mar. 9/2310:20 pmIAD - OPO
1 stop10h 45mTAP AIR PORTUGAL
Deal found 8/16$493
This Rumbo deal was found by Cheapflights users on 8/17. 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.
vie. 10/105:55 pmOPO - IAD
1 stop31h 04mScandinavian Airlines
jue. 10/2310:05 pmIAD - OPO
1 stop14h 00mScandinavian Airlines
Deal found 8/17$495
This oojo deal was found by Cheapflights users on 8/16. 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.
mié. 10/810:25 pmOPO - IAD
1 stop21h 55mTAP AIR PORTUGAL
mar. 10/215:00 pmIAD - OPO
1 stop10h 00mTAP AIR PORTUGAL
Deal found 8/16$498
This Mytrip deal was found by Cheapflights users on 8/16. 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.
jue. 9/1110:25 pmOPO - IAD
1 stop21h 55mTAP AIR PORTUGAL
sáb. 9/275:00 pmIAD - OPO
1 stop19h 00mTAP AIR PORTUGAL
Deal found 8/16$502
This Booking.com deal was found by Cheapflights users on 8/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/110:25 pmOPO - IAD
1 stop21h 55mTAP AIR PORTUGAL
mié. 10/85:50 pmIAD - OPO
1 stop12h 05mTAP AIR PORTUGAL
Deal found 8/17$505
This Mytrip deal was found by Cheapflights users on 8/18. 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.
jue. 10/210:00 amOPO - IAD
1 stop15h 50mTAP AIR PORTUGAL
jue. 10/95:50 pmIAD - OPO
1 stop10h 20mTAP AIR PORTUGAL
Deal found 8/18$516
This United Airlines deal was found by Cheapflights users on 8/17. 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.
lun. 9/159:00 amOPO - IAD
1 stop12h 23mUnited Airlines
lun. 9/225:53 pmIAD - OPO
1 stop10h 52mUnited Airlines
Deal found 8/17$559
This Mytrip deal was found by Cheapflights users on 8/17. 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.
vie. 10/1011:30 amOPO - IAD
2 stops15h 40mMultiple Airlines
jue. 10/238:30 pmIAD - OPO
2 stops19h 50mMultiple Airlines
Deal found 8/17$570
This United Airlines deal was found by Cheapflights users on 8/17. 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.
mié. 12/246:00 amOPO - IAD
1 stop13h 35mUnited Airlines
sáb. 1/36:00 pmIAD - OPO
1 stop16h 05mUnited Airlines
Deal found 8/17$572
This SWISS deal was found by Cheapflights users on 8/16. 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.
jue. 9/117:20 pmOPO - IAD
1 stop25h 55mSWISS
sáb. 9/275:45 pmIAD - OPO
2 stops15h 00mSWISS
Deal found 8/16$573
This SWISS deal was found by Cheapflights users on 8/17. 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.
mié. 10/18:40 amOPO - IAD
1 stop12h 35mSWISS
mié. 10/85:45 pmIAD - OPO
2 stops15h 00mSWISS
Deal found 8/17$577

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 agosto 18, 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

mié. 9/10

10:25 pm-3:20 pm

1 stop21h 55m

Washington, D.C. Dulles Intl

mar. 9/23

10:20 pm-2:05 pm

1 stop10h 45m

$493

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

vie. 10/10

5:55 pm-7:59 pm

1 stop31h 04m

Washington, D.C. Dulles Intl

jue. 10/23

10:05 pm-5:05 pm

1 stop14h 00m

$495

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

mié. 10/8

10:25 pm-3:20 pm

1 stop21h 55m

Washington, D.C. Dulles Intl

mar. 10/21

5:00 pm-8:00 am

1 stop10h 00m

$498

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

jue. 9/11

10:25 pm-3:20 pm

1 stop21h 55m

Washington, D.C. Dulles Intl

sáb. 9/27

5:00 pm-5:00 pm

1 stop19h 00m

$502

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

jue. 10/16

12:25 pm-8:50 pm

1 stop13h 25m

Washington, D.C. Dulles Intl

dom. 10/26

11:30 pm-10:00 am

1 stop30h 30m

$505

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

mié. 10/1

10:25 pm-3:20 pm

1 stop21h 55m

Washington, D.C. Dulles Intl

mié. 10/8

5:50 pm-10:55 am

1 stop12h 05m

$505

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

jue. 10/2

10:00 am-8:50 pm

1 stop15h 50m

Washington, D.C. Dulles Intl

jue. 10/9

5:50 pm-9:10 am

1 stop10h 20m

$516

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

sáb. 1/10

6:00 am-2:35 pm

1 stop13h 35m

Washington, D.C. Dulles Intl

jue. 1/15

8:30 pm-11:10 am

1 stop33h 40m

$532

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

lun. 9/15

9:00 am-4:23 pm

1 stop12h 23m

Washington, D.C. Dulles Intl

lun. 9/22

5:53 pm-9:45 am

1 stop10h 52m

$559

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

mié. 9/10

6:05 am-6:24 pm

2 stops41h 19m

$319

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

Showing 1-10 of 18 results
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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 agosto 18, 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 agosto 18, 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
1,954 reviews

Boarding

7.0

Comfort

7.1

Entertainment

6.3

Overall

7.1

Food

6.2

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
1,954 reviews
TAP AIR PORTUGAL
7.1
Good
1,954 reviews

Boarding

7.0

Comfort

7.1

Entertainment

6.3

Overall

7.1

Food

6.2

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?

    TAP AIR PORTUGAL and Scandinavian Airlines can get you from Porto to Washington, D.C. Dulles Intl Airport in just under 21h 55m. Your travel time can differ by up to 9h 09m. 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 26% 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, July is the cheapest month in which you can book a flight from Porto to Washington, D.C. Dulles Intl Airport (average of $302). 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
Fredericksburg
Gaithersburg
Towson
Linthicum Heights
Fairfax
Manassas
Falls Church
Laurel
Rockville
Oxon Hill
National Harbor
Dundalk
Waldorf
Bowie

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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 Reagan-National flights
Lisbon to Baltimore flights
Porto to Baltimore flights
Porto to Reagan-National 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 agosto 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$492Average$812FlexibilityNo cancel feeOn-timeN/A

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