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$258+ 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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — OPO
Jul 29 — Aug 51
Wed 7/29
Wed 8/5
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 June 29, 2026.

This Mytrip deal was found by Cheapflights users on 6/26. 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.
Tue 8/188:30 pm
BWI
-
OPO
3 stops32h 00m
Multiple Airlines
Tue 8/257:10 am
OPO
-
BWI
2 stops17h 15m
Multiple Airlines
Deal found 6/26$700
This British Airways deal was found by Cheapflights users on 6/26. 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.
Wed 11/188:35 pm
BWI
-
OPO
1 stop16h 15m
British Airways
Mon 11/238:40 pm
OPO
-
BWI
2 stops27h 50m
British Airways
Deal found 6/26$749
This Mytrip deal was found by Cheapflights users on 6/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:30 pm
BWI
-
OPO
2 stops18h 55m
Multiple Airlines
Sun 8/308:20 pm
OPO
-
BWI
2 stops28h 05m
Multiple Airlines
Deal found 6/28$752
This United Airlines deal was found by Cheapflights users on 6/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:51 pm
BWI
-
OPO
2 stops57h 54m
United Airlines
Thu 12/106:00 am
OPO
-
BWI
2 stops19h 57m
United Airlines
Deal found 6/27$756
This Travelocity deal was found by Cheapflights users on 6/27. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/169:30 pm
BWI
-
OPO
1 stop16h 35m
Multiple Airlines
Thu 12/108:20 am
OPO
-
BWI
2 stops15h 25m
Multiple Airlines
Deal found 6/27$759
This Expedia deal was found by Cheapflights users on 6/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/209:30 pm
BWI
-
OPO
1 stop17h 00m
British Airways
Tue 10/278:40 pm
OPO
-
BWI
2 stops25h 44m
British Airways
Deal found 6/28$768
This Mytrip deal was found by Cheapflights users on 6/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/248:30 pm
BWI
-
OPO
3 stops30h 30m
Multiple Airlines
Tue 10/610:25 pm
OPO
-
BWI
2 stops26h 00m
Multiple Airlines
Deal found 6/24$771
This United Airlines deal was found by Cheapflights users on 6/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/2210:10 am
BWI
-
OPO
2 stops18h 20m
United Airlines
Fri 11/276:00 am
OPO
-
BWI
2 stops17h 49m
United Airlines
Deal found 6/27$775
This Delta deal was found by Cheapflights users on 6/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:30 pm
BWI
-
OPO
2 stops15h 55m
Delta
Tue 10/275:00 am
OPO
-
BWI
2 stops20h 32m
Delta
Deal found 6/27$776
This Expedia deal was found by Cheapflights users on 6/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2011:34 am
BWI
-
OPO
2 stops15h 06m
Multiple Airlines
Tue 10/278:40 pm
OPO
-
BWI
2 stops25h 44m
Multiple Airlines
Deal found 6/28$779
This oojo deal was found by Cheapflights users on 6/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2710:35 pm
IAD
-
OPO
1 stop15h 20m
TAP AIR PORTUGAL
Sun 9/209:15 pm
OPO
-
IAD
1 stop22h 55m
TAP AIR PORTUGAL
Deal found 6/28$806
This British Airways deal was found by Cheapflights users on 6/27. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/167:59 pm
DCA
-
OPO
2 stops18h 06m
British Airways
Thu 12/108:20 am
OPO
-
DCA
2 stops18h 55m
British Airways
Deal found 6/27$806

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 June 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$700
(Mytrip)

One-way from

$258
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$1,098
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. 19% potential increase in price ($187 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 29, 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 10/21

9:45 am-7:00 am

1 stop16h 15m

Porto

Mon 10/26

6:00 am-4:55 pm

1 stop14h 55m

$820

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Wed 10/21

10:50 am-7:40 am

2 stops15h 50m

Porto

Mon 10/26

8:40 pm-9:40 pm

2 stops29h 00m

$820

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Tue 11/24

12:00 pm-10:35 am

2 stops17h 35m

Porto

Mon 11/30

11:00 am-6:05 pm

1 stop12h 05m

$844

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Sun 7/26

11:00 am-10:25 am

1 stop18h 25m

Porto

Fri 8/21

5:00 am-6:45 pm

2 stops18h 45m

$862

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Wed 10/21

9:09 am-7:00 am

2 stops16h 51m

Porto

Mon 10/26

6:00 am-6:49 pm

2 stops16h 49m

$865

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 8/12

7:19 pm-3:25 pm

2 stops15h 06m

Porto

Wed 8/19

5:00 am-8:05 pm

2 stops20h 05m

$866

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 10/8

7:59 pm-3:25 pm

2 stops14h 26m

Porto

Tue 10/13

5:00 am-4:30 pm

2 stops16h 30m

$866

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Mon 10/5

6:35 pm-3:25 pm

2 stops15h 50m

Porto

Mon 10/19

11:25 am-10:48 pm

2 stops16h 23m

$866

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Mon 10/5

6:30 pm-3:25 pm

2 stops15h 55m

Porto

Mon 10/19

11:25 am-11:37 pm

2 stops17h 12m

$866

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Sun 7/26

11:52 am-10:25 am

2 stops17h 33m

Porto

Fri 8/21

5:00 am-5:15 pm

2 stops17h 15m

$867

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/26

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 June.
ProviderPrice AccuracyTrust Score*
AranGrantPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice 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 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

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 $274). Flying from Washington, D.C. to Porto in June is currently the most expensive (average of $684). 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 50% 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.

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 22 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.

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 June 29, 2026.
See what other customers who have flown with KLM,Delta, 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.
KLM
7.8
Good
1,531 reviews

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
KLM
7.8
Good
1,531 reviews
KLM
7.8
Good
1,531 reviews

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Delta
7.8
Good
8,449 reviews
KLM
7.8
Good
1,531 reviews

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
United Airlines
7.4
Good
9,894 reviews
KLM
7.8
Good
1,531 reviews

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
TAP AIR PORTUGAL
7.2
Good
2,306 reviews
KLM
7.8
Good
1,531 reviews

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Lufthansa
6.8
Okay
8,108 reviews
KLM
7.8
Good
1,531 reviews

Crew

8.4

Food

7.3

Overall

7.8

Boarding

7.8

Entertainment

7.2

Comfort

7.7

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

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 $820, United Airlines can have you in Porto from Washington, D.C. in 16h 15m. 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 $480, and TAP AIR PORTUGAL, from $501. KLM is priced at 36% 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 $250. Lufthansa flights start at $273 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, December is the cheapest month in which you can book a flight from Washington, D.C. to Porto (average of $274). Flying from Washington, D.C. to Porto in June is currently the most expensive (average of $684). 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

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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 June 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$477Average$883FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$480Average$867FlexibilityNo cancel feeOn-time69%
TAP AIR PORTUGALCheapest$501Average$784FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$514Average$709FlexibilityNo cancel feeOn-time76%
DeltaCheapest$533Average$1,048FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$593Average$690FlexibilityNo cancel feeOn-time77%

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