HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Porto

$321+ Cheap flights from Washington, D.C. (WAS) to Porto (OPO)

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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — OPO
Apr 27 — May 41
Mon 4/27
Mon 5/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Washington, D.C. to Porto 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 Washington, D.C. to Porto

Cheapest flights from Washington, D.C. to Porto
Explore the most affordable flight options available from Washington, D.C. to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2026.

This FlightHub deal was found by Cheapflights users on 3/23. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/139:45 pm
IAD
-
OPO
1 stop31h 00m
Turkish Airlines
Mon 6/86:30 am
OPO
-
IAD
1 stop18h 20m
Turkish Airlines
Deal found 3/23$598
This Kiwi.com deal was found by Cheapflights users on 3/23. 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.
Tue 8/1810:35 pm
IAD
-
OPO
1 stop13h 35m
TAP AIR PORTUGAL
Fri 8/289:00 am
OPO
-
IAD
1 stop11h 10m
TAP AIR PORTUGAL
Deal found 3/23$604
This FlightHub deal was found by Cheapflights users on 3/23. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/121:20 pm
IAD
-
OPO
1 stop21h 30m
Turkish Airlines
Wed 4/2910:45 am
OPO
-
IAD
1 stop29h 50m
Turkish Airlines
Deal found 3/23$607
This oojo deal was found by Cheapflights users on 3/23. 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.
Wed 8/195:45 pm
IAD
-
OPO
1 stop11h 25m
TAP AIR PORTUGAL
Fri 8/289:00 am
OPO
-
IAD
1 stop11h 10m
TAP AIR PORTUGAL
Deal found 3/23$608
This Justfly.com deal was found by Cheapflights users on 3/23. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1610:35 pm
IAD
-
OPO
1 stop11h 25m
TAP AIR PORTUGAL
Sun 8/306:00 pm
OPO
-
IAD
1 stop26h 10m
TAP AIR PORTUGAL
Deal found 3/23$613
This FlightHub deal was found by Cheapflights users on 3/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/245:40 pm
IAD
-
OPO
1 stop10h 20m
TAP AIR PORTUGAL
Sun 8/3010:30 pm
OPO
-
IAD
1 stop21h 40m
TAP AIR PORTUGAL
Deal found 3/27$614
This FlightHub deal was found by Cheapflights users on 3/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/151:20 pm
IAD
-
OPO
1 stop21h 20m
Turkish Airlines
Sat 5/26:15 am
OPO
-
IAD
1 stop18h 35m
Turkish Airlines
Deal found 3/25$616
This Turkish Airlines deal was found by Cheapflights users on 3/24. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/59:45 pm
IAD
-
OPO
1 stop31h 15m
Turkish Airlines
Tue 5/124:50 pm
OPO
-
IAD
1 stop23h 45m
Turkish Airlines
Deal found 3/24$617
This Turkish Airlines deal was found by Cheapflights users on 3/25. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/91:20 pm
IAD
-
OPO
1 stop21h 25m
Turkish Airlines
Wed 4/224:40 pm
OPO
-
IAD
1 stop23h 55m
Turkish Airlines
Deal found 3/25$618
This FlightHub deal was found by Cheapflights users on 3/24. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/191:20 pm
IAD
-
OPO
1 stop21h 30m
Turkish Airlines
Mon 10/264:10 pm
OPO
-
IAD
1 stop24h 35m
Turkish Airlines
Deal found 3/24$623
This FlightHub deal was found by Cheapflights users on 3/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1210:35 pm
IAD
-
OPO
1 stop16h 50m
TAP AIR PORTUGAL
Tue 6/95:05 am
OPO
-
IAD
1 stop15h 05m
TAP AIR PORTUGAL
Deal found 3/27$624
This FlightHub deal was found by Cheapflights users on 3/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/171:20 pm
IAD
-
OPO
1 stop21h 25m
Turkish Airlines
Mon 9/214:50 pm
OPO
-
IAD
1 stop23h 45m
Turkish Airlines
Deal found 3/28$625

Find flight deals from Washington, D.C. to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to Porto (OPO). 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 March 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$594
(FlightHub)

One-way from

$321
(KLM)

Popular in

June

Cheapest in

January

Average price

$655
Provider with most accurate pricing for Washington, D.C. (WAS)-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Porto flights.
Search Deals
From Washington, D.C. (WAS) to Porto
Search Deals
One-way flight from Washington, D.C. (WAS) to Porto
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($117 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Porto 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 March 28, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 8/19

1:00 pm-8:30 am

2 stops14h 30m

Porto

Fri 8/28

5:00 am-3:35 pm

1 stop15h 35m

$777

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 9/23

4:00 pm-3:25 pm

2 stops18h 25m

Porto

Thu 10/1

5:00 am-3:35 pm

1 stop15h 35m

$797

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 5/3

9:45 pm-10:00 pm

1 stop19h 15m

Porto

Tue 10/20

6:15 am-11:02 pm

2 stops21h 47m

$840

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 7/22

9:45 pm-3:25 pm

1 stop12h 40m

Porto

Thu 8/27

5:55 am-4:25 pm

2 stops15h 30m

$840

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sat 4/25

5:15 pm-3:25 pm

2 stops17h 10m

Porto

Thu 5/7

5:00 am-3:35 pm

1 stop15h 35m

$847

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sat 8/15

3:45 pm-7:00 am

1 stop10h 15m

Porto

Sat 8/29

10:15 am-9:28 am

2 stops28h 13m

$883

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 4/13

9:45 pm-10:00 pm

1 stop19h 15m

Porto

Wed 4/29

5:00 am-3:35 pm

1 stop15h 35m

$895

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 4/15

3:00 pm-3:25 pm

2 stops19h 25m

Porto

Wed 4/22

5:00 am-3:35 pm

1 stop15h 35m

$899

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 9/8

7:59 pm-3:25 pm

2 stops14h 26m

Porto

Tue 9/15

6:15 am-7:16 pm

2 stops18h 01m

$905

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Wed 4/15

12:27 pm-3:25 pm

2 stops21h 58m

Porto

Wed 4/22

5:00 am-6:17 pm

2 stops18h 17m

$909

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/23

Showing 1-10 of 58 resultsSorted by cheapest first
1
2
3
...
6

Compare providers for flights from Washington, D.C. to Porto

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 Washington, D.C. to Porto in March.
ProviderPrice AccuracyTrust Score*
AranGrantPrice Accuracy2 starsTrust Score*2 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
ExpediaPrice 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 Washington, D.C.-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C.-Porto 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 Washington, D.C.-Porto 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 Washington, D.C. to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Washington, D.C. 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 Washington, D.C. to Porto

How far ahead should I book a flight from Washington, D.C. to Porto?

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to Porto. Price data was last updated on March 13, 2026.

The best time to book flights from Washington, D.C. to Porto is 90 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, December is the cheapest month in which you can book a flight from Washington, D.C. to Porto (average of $357). Flying from Washington, D.C. to Porto in June is currently the most expensive (average of $686). 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.

How much does it cost to fly round-trip from Washington, D.C. to Porto?

What’s the top layover airport for flights from Washington, D.C. to Porto?

Share of 1-stop round-trip flights from Washington, D.C. to Porto chosen by Cheapflights users in the past 12 months, using the same layover each way.

Lisbon (LIS) – chosen by Cheapflights users on 67% of 1-stop itineraries from Washington, D.C. to Porto on Cheapflights.

What’s the cheapest layover airport for flights from Washington, D.C. to Porto?

Average round-trip fare for 1-stop flights from Washington, D.C. to Porto, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Istanbul (IST) is the most affordable 1-stop option, with an average round-trip price of $608.

What’s the fastest layover option from Washington, D.C. to Porto?

Shortest average travel time for 1-stop one-way flights from Washington, D.C. to Porto, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Lisbon (LIS) have the shortest average one-way travel time for 1-stop routes: 11h 53m.

Which airport typically offers the quickest layover for flights from Washington, D.C. to Porto?

Average layover duration for 1-stop one-way flights from Washington, D.C. to Porto, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Lisbon (LIS) offer the fastest connection on this route, with an average layover time of 3h 16m.

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated March 28, 2026.
See what other customers who have flown with Delta,KLM, andUnited Airlines from Washington, D.C. to Porto have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,357 reviews

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,357 reviews
Delta
7.9
Good
8,357 reviews

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
KLM
7.8
Good
1,477 reviews
Delta
7.9
Good
8,357 reviews

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,504 reviews
Delta
7.9
Good
8,357 reviews

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
TAP AIR PORTUGAL
7.1
Good
2,183 reviews
Delta
7.9
Good
8,357 reviews

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Lufthansa
6.8
Okay
7,872 reviews
Delta
7.9
Good
8,357 reviews

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

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

    Most people fly into Porto (OPO) if they book a flight to Porto from Washington, D.C.. On average, Porto has 0 inbound flights from Washington, D.C. per day from 6 airlines. Porto is conveniently located just 6.8 mi from Porto’s city center.

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

    For as low as $946, Delta can have you in Porto from Washington, D.C. in 10h 50m. The distance from Washington, D.C. to Porto is about 3520 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Washington, D.C. to Porto round-trip?

    Cheapflights users have booked flights from Washington, D.C. to Porto round-trip from $477. Other airlines that can offer you cheap pricing are TAP AIR PORTUGAL, from $490, and United Airlines, from $494. KLM is priced at 33% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Washington, D.C. to Porto one-way?

    To fly one-way, consider booking your trip with TAP AIR PORTUGAL, which is currently one of the cheapest options available, starting at $251. KLM flights start at $356 while deals on United Airlines start at $375 one-way.

  • What are the most popular routes from Washington, D.C. to Porto?

    The most popular flight routes from Washington, D.C. to Porto are Washington, D.C. Dulles Intl - Porto, Washington, D.C. Reagan-National - Porto and Baltimore/Washington - Porto.

  • Can I find deals for flights from Washington, D.C. to Porto that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to Porto?

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

  • Can I find deals for business class flights from Washington, D.C. to Porto?

    Yes. Cheapflights offers flight deals from Washington, D.C. to Porto 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 Washington, D.C. to Porto?

    Currently, December is the cheapest month in which you can book a flight from Washington, D.C. to Porto (average of $357). Flying from Washington, D.C. to Porto in June is currently the most expensive (average of $686). 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 Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

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 Washington, D.C. to Porto

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

Top 6 airlines flying from Washington, D.C. to Porto

Discover the top 6 airlines that operate flights from Washington, D.C. to Porto. 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 March 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$477Average$751FlexibilityNo cancel feeOn-time75%
TAP AIR PORTUGALCheapest$490Average$752FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$494Average$852FlexibilityNo cancel feeOn-time69%
IberiaCheapest$515Average$672FlexibilityNo cancel feeOn-time77%
DeltaCheapest$529Average$866FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$564Average$709FlexibilityNo cancel feeOn-time76%

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.