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$342+ 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 6/7. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — OPO
Jun 10 — Jun 171
Wed 6/10
Wed 6/17
1 adult, Economy
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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 May 11, 2026.

This oojo deal was found by Cheapflights users on 5/7. 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 9/89:45 pm
IAD
-
OPO
1 stop36h 55m
Turkish Airlines
Tue 9/154:50 pm
OPO
-
IAD
1 stop23h 45m
Turkish Airlines
Deal found 5/7$724
This Cheapflightsfares deal was found by Cheapflights users on 5/6. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1010:35 pm
IAD
-
OPO
1 stop16h 50m
TAP AIR PORTUGAL
Tue 8/2510:30 pm
OPO
-
IAD
1 stop21h 40m
TAP AIR PORTUGAL
Deal found 5/6$727
This United Airlines deal was found by Cheapflights users on 5/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/265:20 pm
IAD
-
OPO
1 stop12h 10m
United Airlines
Thu 11/56:00 am
OPO
-
IAD
1 stop14h 50m
United Airlines
Deal found 5/6$732
This Delta deal was found by Cheapflights users on 5/6. 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.
Mon 10/267:50 pm
IAD
-
OPO
1 stop10h 40m
Delta
Mon 11/911:15 am
OPO
-
IAD
1 stop33h 30m
Delta
Deal found 5/6$734
This Delta deal was found by Cheapflights users on 5/6. 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.
Wed 10/2810:05 am
IAD
-
OPO
2 stops18h 00m
Delta
Wed 11/411:15 am
OPO
-
IAD
1 stop33h 30m
Delta
Deal found 5/6$738
This United Airlines deal was found by Cheapflights users on 5/9. 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 10/288:15 am
BWI
-
OPO
2 stops21h 15m
United Airlines
Tue 11/312:30 pm
OPO
-
BWI
2 stops17h 08m
United Airlines
Deal found 5/9$742
This United Airlines deal was found by Cheapflights users on 5/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:00 pm
DCA
-
OPO
1 stop11h 30m
United Airlines
Fri 11/66:00 am
OPO
-
DCA
2 stops18h 33m
United Airlines
Deal found 5/6$742
This Delta deal was found by Cheapflights users on 5/6. 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.
Mon 10/267:59 pm
IAD
-
OPO
2 stops15h 26m
Delta
Mon 11/211:15 am
OPO
-
IAD
1 stop33h 30m
Delta
Deal found 5/6$743
This Delta deal was found by Cheapflights users on 5/6. 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.
Wed 10/2811:00 am
DCA
-
OPO
1 stop17h 05m
Delta
Tue 11/35:00 am
OPO
-
DCA
2 stops22h 53m
Delta
Deal found 5/6$743
This FlightHub deal was found by Cheapflights users on 5/6. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/219:45 pm
IAD
-
OPO
1 stop36h 55m
Turkish Airlines
Mon 9/284:50 pm
OPO
-
IAD
1 stop23h 45m
Turkish Airlines
Deal found 5/6$744
This Delta deal was found by Cheapflights users on 5/6. 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.
Wed 10/285:00 pm
DCA
-
OPO
1 stop11h 05m
Delta
Tue 11/1011:15 am
OPO
-
DCA
2 stops16h 49m
Delta
Deal found 5/6$744
This Delta deal was found by Cheapflights users on 5/6. 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 10/317:59 pm
IAD
-
OPO
1 stop33h 06m
Delta
Mon 11/911:15 am
OPO
-
IAD
1 stop33h 30m
Delta
Deal found 5/6$745

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 May 11, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$724
(oojo)

One-way from

$342
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$809
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. 18% potential increase in price ($170 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 11, 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

Mon 8/17

3:45 pm-7:00 am

1 stop10h 15m

Porto

Fri 9/4

6:00 am-4:05 pm

1 stop15h 05m

$792

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 8/16

6:15 am-9:45 am

1 stop22h 30m

Porto

Wed 8/26

2:25 pm-11:01 am

1 stop25h 36m

$792
Quickest round-trip

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 11/1

10:30 pm-1:30 pm

1 stop10h 00m

Porto

Wed 11/11

2:30 pm-8:35 pm

1 stop11h 05m

$836

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Thu 10/1

11:00 am-10:30 am

1 stop18h 30m

Porto

Thu 10/29

10:00 am-11:04 pm

1 stop17h 04m

$871

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Thu 10/1

12:15 pm-10:30 am

2 stops17h 15m

Porto

Thu 10/29

10:00 am-10:37 pm

2 stops16h 37m

$876

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Wed 9/9

6:00 am-9:45 am

1 stop22h 45m

Porto

Tue 9/22

12:15 pm-3:40 pm

1 stop32h 25m

$879

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sat 8/8

10:29 pm-9:45 am

1 stop30h 16m

Porto

Wed 8/19

6:00 am-3:15 pm

1 stop14h 15m

$887

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

5:00 am-4:25 pm

2 stops16h 25m

$895

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 7/15

6:33 am-9:45 am

1 stop22h 12m

Porto

Wed 7/22

11:20 am-3:01 pm

1 stop32h 41m

$909

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 7/7

6:36 pm-10:30 am

1 stop10h 54m

Porto

Wed 7/15

5:00 am-3:35 pm

1 stop15h 35m

$911

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/10

Showing 1-10 of 52 resultsSorted by cheapest first
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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 May.
ProviderPrice AccuracyTrust Score*
AranGrantPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 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 Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Washington, D.C.-Porto flight deals on Cheapflights vs. Ovago >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 Ovago the most. Ovago 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?

The best time to book flights from Washington, D.C. to Porto is 85 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, November is the cheapest month in which you can book a flight from Washington, D.C. to Porto (average of $132). Flying from Washington, D.C. to Porto in June is currently the most expensive (average of $651). 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.

Newark (EWR) – chosen by Cheapflights users on 40% 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 Newark (EWR) have the shortest average one-way travel time for 1-stop routes: 11h 25m.

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 Newark (EWR) offer the fastest connection on this route, with an average layover time of 3h 12m.

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 May 11, 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
8,456 reviews

Overall

7.9

Boarding

8.1

Comfort

7.8

Food

7.2

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.9
Good
8,456 reviews
Delta
7.9
Good
8,456 reviews

Overall

7.9

Boarding

8.1

Comfort

7.8

Food

7.2

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
KLM
7.8
Good
1,514 reviews
Delta
7.9
Good
8,456 reviews

Overall

7.9

Boarding

8.1

Comfort

7.8

Food

7.2

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
9,701 reviews
Delta
7.9
Good
8,456 reviews

Overall

7.9

Boarding

8.1

Comfort

7.8

Food

7.2

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
TAP AIR PORTUGAL
7.2
Good
2,250 reviews
Delta
7.9
Good
8,456 reviews

Overall

7.9

Boarding

8.1

Comfort

7.8

Food

7.2

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Lufthansa
6.8
Okay
7,992 reviews
Delta
7.9
Good
8,456 reviews

Overall

7.9

Boarding

8.1

Comfort

7.8

Food

7.2

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

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 $836, United Airlines can have you in Porto from Washington, D.C. in 10h. The distance from Washington, D.C. to Porto is about 3537 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 United Airlines, from $493, and TAP AIR PORTUGAL, from $497. KLM is priced at 34% 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. Lufthansa flights start at $300 while deals on KLM start at $356 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, November is the cheapest month in which you can book a flight from Washington, D.C. to Porto (average of $132). Flying from Washington, D.C. to Porto in June is currently the most expensive (average of $651). 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

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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 May 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$477Average$883FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$493Average$851FlexibilityNo cancel feeOn-time69%
TAP AIR PORTUGALCheapest$497Average$777FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$514Average$724FlexibilityNo cancel feeOn-time76%
IberiaCheapest$515Average$653FlexibilityNo cancel feeOn-time77%
DeltaCheapest$529Average$915FlexibilityNo cancel feeOn-timeN/A

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