Porto

$241+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — OPO
Aug 25 — Sep 11
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Cheapflights Tip: The best prices from Washington, D.C. to Porto are usually found in November or October, booked 74 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 August 20, 2025.

Round-trip from

$525
(United Airlines)

One-way from

$241
(Mytrip)

Popular in

June

Cheapest in

November

Average price

$787
From Washington, D.C. (WAS) to Porto
One-way flight from Washington, D.C. (WAS) to Porto
Highest demand for flights based on searches. 19% potential increase in price ($168 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
Average for round-trip flights in August 2025

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 August 20, 2025.

This United Airlines deal was found by Cheapflights users on 8/18. 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 11/510:56 amBWI - OPO
2 stops23h 29mUnited Airlines
Fri 11/1412:35 pmOPO - BWI
2 stops26h 24mUnited Airlines
Deal found 8/18$525
This British Airways deal was found by Cheapflights users on 8/20. 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.
Tue 11/258:35 pmBWI - OPO
1 stop16h 00mBritish Airways
Wed 12/106:30 pmOPO - BWI
1 stop29h 15mBritish Airways
Deal found 8/20$547
This oojo deal was found by Cheapflights users on 8/19. 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 9/3010:20 pmIAD - OPO
1 stop13h 40mTAP AIR PORTUGAL
Wed 10/89:15 pmOPO - IAD
1 stop28h 35mTAP AIR PORTUGAL
Deal found 8/19$556
This KAYAK deal was found by Cheapflights users on 8/20. 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.
Tue 11/258:30 pmIAD - OPO
1 stop33h 45mSWISS
Fri 12/57:20 pmOPO - IAD
1 stop26h 20mSWISS
Deal found 8/20$558
This CheapOair deal was found by Cheapflights users on 8/18. 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 10/233:36 pmIAD - OPO
2 stops21h 54mAir Canada
Tue 11/46:00 amOPO - IAD
2 stops19h 29mAir Canada
Deal found 8/18$559
This Iberia deal was found by Cheapflights users on 8/20. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2712:56 pmDCA - OPO
2 stops17h 49mIberia
Tue 12/98:20 amOPO - DCA
2 stops15h 39mIberia
Deal found 8/20$559
This Air Canada deal was found by Cheapflights users on 8/20. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/279:45 amIAD - OPO
2 stops21h 20mAir Canada
Wed 12/106:00 amOPO - IAD
2 stops19h 29mAir Canada
Deal found 8/20$560
This United Airlines deal was found by Cheapflights users on 8/18. 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.
Sat 11/84:10 pmDCA - OPO
2 stops42h 05mUnited Airlines
Sun 11/166:00 amOPO - DCA
2 stops31h 58mUnited Airlines
Deal found 8/18$563
This United Airlines deal was found by Cheapflights users on 8/19. 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 11/78:15 amIAD - OPO
2 stops25h 30mUnited Airlines
Fri 2/276:00 amOPO - IAD
2 stops34h 44mUnited Airlines
Deal found 8/19$564
This FlightHub deal was found by Cheapflights users on 8/18. 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 10/69:40 pmIAD - OPO
1 stop31h 10mTurkish Airlines
Tue 10/1410:50 amOPO - IAD
1 stop29h 55mTurkish Airlines
Deal found 8/18$566
This Air Canada deal was found by Cheapflights users on 8/20. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/259:40 amDCA - OPO
2 stops21h 00mAir Canada
Sun 12/76:00 amOPO - DCA
2 stops19h 40mAir Canada
Deal found 8/20$566
This United Airlines deal was found by Cheapflights users on 8/18. 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.
Sat 11/810:35 pmIAD - OPO
2 stops32h 05mUnited Airlines
Sun 11/166:00 amOPO - IAD
2 stops19h 57mUnited Airlines
Deal found 8/18$567

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 August 20, 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

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Wed 11/5

10:56 am-3:25 pm

2 stops23h 29m

Porto

Fri 11/14

12:35 pm-9:59 am

2 stops26h 24m

$525

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 9/30

10:20 pm-5:00 pm

1 stop13h 40m

Porto

Wed 10/8

9:15 pm-8:50 pm

1 stop28h 35m

$556

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Fri 11/7

8:30 pm-11:15 am

1 stop33h 45m

Porto

Sat 11/15

6:00 am-8:29 pm

2 stops19h 29m

$557

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 11/25

8:30 pm-11:15 am

1 stop33h 45m

Porto

Fri 12/5

7:20 pm-4:40 pm

1 stop26h 20m

$558

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Fri 11/28

6:20 pm-8:00 pm

2 stops20h 40m

Porto

Wed 12/10

12:25 pm-4:30 pm

1 stop33h 05m

$559

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 11/25

4:30 pm-11:15 am

2 stops37h 45m

Porto

Mon 12/8

6:00 am-9:20 pm

2 stops44h 20m

$559

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 11/12

9:45 am-3:25 pm

2 stops24h 40m

Porto

Sun 11/16

6:00 am-9:20 pm

2 stops44h 20m

$559

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 11/26

5:15 pm-11:50 am

2 stops37h 35m

Porto

Mon 12/8

6:00 am-8:29 pm

2 stops43h 29m

$559

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sun 11/30

6:20 pm-7:40 am

2 stops32h 20m

Porto

Sat 12/6

8:40 pm-4:30 pm

1 stop24h 50m

$559

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Sat 11/8

10:11 pm-3:15 pm

2 stops36h 04m

Porto

Sun 11/16

6:00 am-3:50 pm

1 stop14h 50m

$559

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 59 results
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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 August 8, 2025.

The best time to book flights from Washington, D.C. to Porto is 74 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, January is the cheapest month in which you can book a flight from Washington, D.C. to Porto (average of $523). Flying from Washington, D.C. to Porto in June is currently the most expensive (average of $1,030). 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 August 20, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 17% on flights from Washington, D.C. to Porto by exploring options for tickets in the afternoon.

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 at noon when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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.

Frankfurt am Main (FRA) – 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.

Frankfurt am Main (FRA) is the most affordable 1-stop option, with an average round-trip price of $689.

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: 10h 20m.

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 1h 50m.

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 August 20, 2025.
See what other customers who have flown with Delta, KLM, and United 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.
8.0
Very good

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good
8.0
Very good

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 7 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 $556, United Airlines can have you in Porto from Washington, D.C. in 13h 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 $418. Other airlines that can offer you cheap pricing are KLM, from $424, and TAP AIR PORTUGAL, from $471. Delta is priced at 39% 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 $249. PLAY flights start at $289 while deals on United Airlines start at $354 one-way.

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

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

  • 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 $30.

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

    Most Paris visitors opt to spend their time at Eiffel Tower, Champs-Elysées, and Louvre Museum. Those on a layover in Paris interested in visiting Eiffel Tower, Champs-Elysées, or Louvre Museum can do so by traveling 15.8 mi, 14.7 mi, and 14.3 mi, respectively from Paris Charles de Gaulle. Those landing in Paris looking to spend some time exploring during their layover can rent a car for about $42 per day.

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

  • 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, January is the cheapest month in which you can book a flight from Washington, D.C. to Porto (average of $523). Flying from Washington, D.C. to Porto in June is currently the most expensive (average of $1,030). 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 7 airlines flying from Washington, D.C. to Porto

Discover the top 7 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 August 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$418Average$740FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$424Average$693FlexibilityNo cancel feeOn-time75%
TAP AIR PORTUGALCheapest$471Average$772FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$515Average$692FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$520Average$941FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$573Average$698FlexibilityNo cancel feeOn-time71%
LufthansaCheapest$620Average$691FlexibilityNo cancel feeOn-time76%

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