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$337+ 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 1/15. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — OPO
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. to Porto are usually found in October or February, booked 64 days in advance, depart on a Sunday or Monday and return on a Thursday

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 December 12, 2025.

This Orbitz deal was found by Cheapflights users on 12/10. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:45 pmIAD - OPO
1 stop15h 00mBritish Airways
Wed 1/76:35 pmOPO - IAD
1 stop26h 00mBritish Airways
Deal found 12/10$752
This SWISS deal was found by Cheapflights users on 12/9. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/105:20 pmIAD - OPO
1 stop33h 35mSWISS
Wed 12/1712:10 pmOPO - IAD
1 stop33h 30mSWISS
Deal found 12/9$761
This KLM deal was found by Cheapflights users on 12/9. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/106:05 pmIAD - OPO
1 stop11h 25mKLM
Wed 12/1711:15 amOPO - IAD
1 stop33h 50mKLM
Deal found 12/9$783
This oojo deal was found by Cheapflights users on 12/10. 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 12/301:44 pmDCA - OPO
2 stops23h 01mBritish Airways
Wed 1/76:35 pmOPO - DCA
2 stops27h 15mBritish Airways
Deal found 12/10$785
This Delta deal was found by Cheapflights users on 12/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1011:58 amIAD - OPO
2 stops17h 32mDelta
Wed 12/176:00 amOPO - IAD
1 stop15h 05mDelta
Deal found 12/9$788
This Expedia deal was found by Cheapflights users on 12/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1010:55 pmIAD - OPO
2 stops31h 45mMultiple Airlines
Wed 12/177:20 pmOPO - IAD
1 stop25h 10mMultiple Airlines
Deal found 12/9$819
This United Airlines deal was found by Cheapflights users on 12/9. 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 12/106:10 pmIAD - OPO
2 stops36h 30mUnited Airlines
Wed 12/176:00 amOPO - IAD
2 stops20h 25mUnited Airlines
Deal found 12/9$820
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/113:54 pmDCA - OPO
2 stops20h 21mBritish Airways
Thu 12/188:20 amOPO - DCA
2 stops18h 40mBritish Airways
Deal found 12/10$880
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/138:45 pmIAD - OPO
1 stop15h 10mMultiple Airlines
Mon 2/28:40 pmOPO - IAD
2 stops28h 15mMultiple Airlines
Deal found 12/10$888
This United Airlines deal was found by Cheapflights users on 12/10. 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.
Thu 12/116:10 pmIAD - OPO
2 stops36h 30mUnited Airlines
Wed 12/176:00 amOPO - IAD
2 stops37h 00mUnited Airlines
Deal found 12/10$895
This Expedia deal was found by Cheapflights users on 12/11. 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.
Fri 12/126:30 pmDCA - OPO
2 stops32h 10mIberia
Fri 12/1912:25 pmOPO - DCA
2 stops35h 33mIberia
Deal found 12/11$941
This Delta deal was found by Cheapflights users on 12/11. 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 12/136:19 pmBWI - OPO
2 stops16h 06mDelta
Mon 2/211:15 amOPO - BWI
2 stops18h 26mDelta
Deal found 12/11$973

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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$434
(Kiwi.com)

One-way from

$337
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$832
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 ($126 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 12, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Porto that are best for you.

Fly from

Washington, D.C.

Fly to

Porto

Route

Depart

Return

Price

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 3/24

5:25 pm-11:15 am

1 stop13h 50m

Porto

Tue 3/31

8:40 am-4:20 pm

1 stop12h 40m

$463

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 3/24

5:35 pm-9:30 am

1 stop11h 55m

Porto

Tue 3/31

6:00 am-7:55 pm

1 stop18h 55m

$476

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 3/10

7:50 pm-10:30 am

1 stop10h 40m

Porto

Mon 3/16

11:15 am-5:05 pm

1 stop33h 50m

$478

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 1/18

6:50 pm-10:30 am

1 stop10h 40m

Porto

Mon 1/26

11:15 am-4:05 pm

1 stop33h 50m

$478

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 2/24

12:35 pm-10:30 am

2 stops16h 55m

Porto

Tue 3/3

4:10 pm-4:05 pm

1 stop28h 55m

$482

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 3/24

5:25 pm-11:15 am

1 stop13h 50m

Porto

Mon 3/30

7:20 pm-4:20 pm

1 stop26h 00m

$482

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 2/24

12:38 pm-10:30 am

2 stops16h 52m

Porto

Tue 3/3

5:00 am-4:05 pm

1 stop16h 05m

$482

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 1/19

12:23 pm-10:30 am

2 stops17h 07m

Porto

Mon 1/26

11:15 am-4:05 pm

1 stop33h 50m

$482

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 1/12

12:23 pm-10:30 am

2 stops17h 07m

Porto

Mon 1/26

11:15 am-4:05 pm

1 stop33h 50m

$484

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 3/24

1:13 pm-12:05 pm

2 stops18h 52m

Porto

Mon 3/30

7:20 pm-3:15 pm

1 stop24h 55m

$486

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 58 results
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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 December.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars
ExpediaPrice Accuracy2 starsTrust 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Washington, D.C.-Porto flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 December 5, 2025.

The best time to book flights from Washington, D.C. to Porto is 64 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 $332). Flying from Washington, D.C. to Porto in May is currently the most expensive (average of $688). 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 WAS to OPO?

Find hourly flight availability from Washington, D.C. to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 12, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 29% on flights from Washington, D.C. to Porto by exploring options for tickets in the morning.

What is the cheapest day to fly from Washington, D.C. to Porto?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Porto. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Washington, D.C. to Porto flight should consider departing on Sunday afternoons when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 12, 2025.
See what other customers who have flown with Delta, United Airlines, and TAP AIR PORTUGAL 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
8,005 reviews

Entertainment

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

Overall

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
8,005 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

Overall

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
9,095 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

Overall

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
2,087 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

Overall

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.
Iberia
7.0
Good
3,045 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

Overall

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
7,626 reviews
Delta
7.9
Good
8,005 reviews

Entertainment

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

Overall

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 $478, SWISS can have you in Porto from Washington, D.C. in 10h 40m. 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 $439. Other airlines that can offer you cheap pricing are United Airlines, from $494, and TAP AIR PORTUGAL, from $505. Delta is priced at 40% 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 $253. KLM flights start at $384 while deals on United Airlines start at $483 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.

  • Where are the most common layover locations when flying from Washington, D.C. to Porto?

    Washington, D.C. to Porto flights have a layover in Lisbon most often.

  • What are some popular things to do or see while on a layover in Lisbon?

    Chiado, Praça do Marquês de Pombal, and Londres are the most popular attractions in Lisbon if you're in need of something to do during your layover. Chiado, Praça do Marquês de Pombal, and Londres can be accessed by traveling approximately 4.5 mi, 3.6 mi, and 2.3 mi, respectively from Lisbon Humberto Delgado. Those on a layover in Lisbon in need of a rental car can book one at Lisbon Humberto Delgado for about $16.

  • Where are the least popular layover locations for Washington, D.C. to Porto flights?

    Washington, D.C. to Porto flights that have layovers will least frequently stop in Madrid.

  • 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 $332). Flying from Washington, D.C. to Porto in May is currently the most expensive (average of $688). 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
Aveiro
Arcos de Valdevez
Coimbra
Vila Nova de Gaia

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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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$439Average$764FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$494Average$934FlexibilityNo cancel feeOn-time69%
TAP AIR PORTUGALCheapest$505Average$777FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$515Average$672FlexibilityNo cancel feeOn-time77%
KLMCheapest$555Average$741FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$615Average$693FlexibilityNo cancel feeOn-time76%

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