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$295+ 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 1/30. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — OPO
Nov 26 — Dec 31
Wed 11/26
Wed 12/3
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. to Porto are usually found in January or October, booked 40 days in advance, depart on a Sunday or Monday and return on a Thursday

Cheap 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 October 27, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$492
(KAYAK)

One-way from

$327
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$598
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. 15% potential increase in price ($136 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find 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 October 27, 2025.

This Delta deal was found by Cheapflights users on 10/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/17:49 pmIAD - OPO
2 stops33h 41mDelta
Mon 12/86:30 amOPO - IAD
2 stops58h 09mDelta
Deal found 10/25$492
This Delta deal was found by Cheapflights users on 10/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/111:51 pmBWI - OPO
2 stops15h 39mDelta
Tue 11/186:05 amOPO - BWI
2 stops17h 58mDelta
Deal found 10/24$492
This KLM deal was found by Cheapflights users on 10/24. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/92:00 pmDCA - OPO
2 stops15h 30mMultiple Airlines
Tue 12/1611:15 amOPO - DCA
2 stops16h 42mMultiple Airlines
Deal found 10/24$492
This Mytrip deal was found by Cheapflights users on 10/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/238:30 pmIAD - OPO
1 stop33h 45mMultiple Airlines
Mon 12/84:15 pmOPO - IAD
2 stops33h 11mMultiple Airlines
Deal found 10/25$493
This United Airlines deal was found by Cheapflights users on 10/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/235:12 pmBWI - OPO
2 stops35h 18mUnited Airlines
Tue 12/166:00 amOPO - BWI
2 stops20h 08mUnited Airlines
Deal found 10/26$493
This Gotogate deal was found by Cheapflights users on 10/25. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/44:30 pmIAD - OPO
2 stops21h 00mMultiple Airlines
Mon 12/87:20 pmOPO - IAD
1 stop26h 20mMultiple Airlines
Deal found 10/25$494
This United Airlines deal was found by Cheapflights users on 10/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/106:20 pmDCA - OPO
1 stop10h 10mUnited Airlines
Wed 11/2612:35 pmOPO - DCA
1 stop11h 29mUnited Airlines
Deal found 10/26$494
This KAYAK deal was found by Cheapflights users on 10/26. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/98:30 pmIAD - OPO
1 stop33h 45mSWISS
Mon 11/179:10 amOPO - IAD
2 stops36h 30mSWISS
Deal found 10/26$495
This Priceline deal was found by Cheapflights users on 10/25. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/36:00 amDCA - OPO
2 stops26h 15mAir Canada
Mon 12/86:00 amOPO - DCA
2 stops57h 21mAir Canada
Deal found 10/25$495
This KLM deal was found by Cheapflights users on 10/25. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/37:35 pmIAD - OPO
2 stops14h 50mKLM
Tue 12/96:05 amOPO - IAD
2 stops17h 16mKLM
Deal found 10/25$497
This Delta deal was found by Cheapflights users on 10/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/305:36 pmBWI - OPO
2 stops16h 49mDelta
Tue 1/136:05 amOPO - BWI
2 stops22h 02mDelta
Deal found 10/26$497
This Delta deal was found by Cheapflights users on 10/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/911:10 amDCA - OPO
2 stops18h 20mDelta
Tue 11/256:05 amOPO - DCA
2 stops22h 36mDelta
Deal found 10/26$497

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 October 27, 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 11/18

6:00 am-10:30 am

2 stops23h 30m

Porto

Tue 12/2

6:05 am-7:19 pm

2 stops42h 14m

$492

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Wed 1/14

10:05 am-12:05 pm

2 stops21h 00m

Porto

Thu 1/22

6:00 am-9:41 pm

2 stops20h 41m

$492

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 12/9

12:19 pm-10:30 am

2 stops17h 11m

Porto

Tue 12/16

6:05 am-9:29 pm

2 stops20h 24m

$492

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Tue 12/9

2:00 pm-10:30 am

2 stops15h 30m

Porto

Tue 12/16

11:15 am-10:57 pm

2 stops16h 42m

$492

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 12/2

12:19 pm-10:30 am

2 stops17h 11m

Porto

Tue 12/9

6:05 am-9:29 pm

2 stops20h 24m

$492

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 11/16

5:59 pm-10:30 am

2 stops35h 31m

Porto

Tue 12/2

6:05 am-7:19 pm

2 stops42h 14m

$492

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Wed 12/3

10:47 am-10:30 am

2 stops18h 43m

Porto

Wed 12/10

6:00 am-12:22 am

2 stops23h 22m

$492

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Mon 1/12

11:00 am-10:30 am

2 stops18h 30m

Porto

Thu 2/26

6:35 am-7:20 pm

2 stops17h 45m

$492

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Wed 1/14

11:00 am-10:30 am

2 stops18h 30m

Porto

Thu 2/26

6:35 am-10:56 pm

2 stops21h 21m

$492

Washington, D.C.Porto

DCA - OPO

DCAOPO

Washington, D.C. Reagan-National

Wed 1/14

11:00 am-10:30 am

2 stops18h 30m

Porto

Fri 2/27

6:30 am-10:56 pm

2 stops21h 26m

$492

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/24

Showing 1-10 of 53 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 October.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 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 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 October 24, 2025.

The best time to book flights from Washington, D.C. to Porto is 40 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, February is the cheapest month in which you can book a flight from Washington, D.C. to Porto (average of $406). 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 October 27, 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 Tuesday mornings 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 October 27, 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
7,996 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
7.9
Good
7,996 reviews
Delta
7.9
Good
7,996 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
United Airlines
7.4
Good
8,997 reviews
Delta
7.9
Good
7,996 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
TAP AIR PORTUGAL
7.1
Good
2,033 reviews
Delta
7.9
Good
7,996 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Iberia
7.0
Good
3,001 reviews
Delta
7.9
Good
7,996 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Lufthansa
6.8
Okay
7,532 reviews
Delta
7.9
Good
7,996 reviews

Food

7.3

Overall

7.9

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

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 $494, Delta can have you in Porto from Washington, D.C. in 10h 10m. 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 $493. Other airlines that can offer you cheap pricing are TAP AIR PORTUGAL, from $506, and Iberia, from $515. United Airlines is priced at 32% lower than the current average price of a flight leaving 3 months from now.

  • 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. Amsterdam sees the next most layovers on Washington, D.C. to Porto flights.

  • 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 $17.

  • What are some popular points of interest to see during a layover in Amsterdam?

    Most Amsterdam visitors opt to spend their time at Museumplein, Van Gogh Museum, and De Dam. Those on a layover in Amsterdam interested in visiting Museumplein, Van Gogh Museum, or De Dam can do so by traveling 6.0 mi, 6.0 mi, and 7.0 mi, respectively from Amsterdam Schiphol. Those landing in Amsterdam looking to spend some time exploring during their layover can rent a car for about $48 per day.

  • 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 Amsterdam.

  • 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, February is the cheapest month in which you can book a flight from Washington, D.C. to Porto (average of $406). 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

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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 October 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$493Average$935FlexibilityNo cancel feeOn-time69%
TAP AIR PORTUGALCheapest$506Average$790FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$515Average$672FlexibilityNo cancel feeOn-time77%
DeltaCheapest$529Average$828FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$555Average$741FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$618Average$693FlexibilityNo cancel feeOn-time76%

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