HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Porto

$309+ Cheap flights from Washington 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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — OPO
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Washington to Porto with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Washington to Porto

Keep the following information in mind while searching for Washington to Porto flight deals. Data was last updated August 18, 2025.

Round-trip from

$594
(United Airlines)

One-way from

$309
(Kiwi.com)

Popular in

June

Cheapest in

March

Average price

$1,116
From Washington to Porto
Search Deals
One-way flight from Washington to Porto
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($200 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Washington to Porto

Cheapest flights from Washington to Porto
Explore the most affordable flight options available from Washington to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 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.
Sun 11/1611:59 pmPDX - OPO
2 stops25h 31mUnited Airlines
Tue 11/256:00 amOPO - PDX
2 stops26h 45mUnited Airlines
Deal found 8/18$594
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.
Sun 11/1611:59 pmPDX - OPO
2 stops25h 31mUnited Airlines
Wed 11/2612:35 pmOPO - PDX
1 stop17h 35mUnited Airlines
Deal found 8/18$597
This Iberia 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/152:16 pmPDX - OPO
2 stops33h 24mIberia
Tue 11/258:40 pmOPO - PDX
2 stops32h 40mIberia
Deal found 8/18$625
This CrystalTravel deal was found by Cheapflights users on 8/17. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1812:30 pmSEA - OPO
1 stop19h 20mTurkish Airlines
Wed 10/14:50 pmOPO - SEA
1 stop25h 45mTurkish Airlines
Deal found 8/17$632
This United 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/187:00 amPDX - OPO
2 stops18h 30mMultiple Airlines
Fri 11/286:15 amOPO - PDX
2 stops20h 15mMultiple Airlines
Deal found 8/18$633
This KLM deal was found by Cheapflights users on 8/16. 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 11/181:40 pmSEA - OPO
1 stop12h 50mMultiple Airlines
Thu 11/2711:25 amOPO - SEA
1 stop33h 50mMultiple Airlines
Deal found 8/16$635
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/188:30 amPDX - OPO
2 stops20h 20mLufthansa
Mon 12/112:30 pmOPO - PDX
2 stops44h 14mLufthansa
Deal found 8/18$636
This KLM deal was found by Cheapflights users on 8/16. 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.
Mon 11/179:30 amSEA - OPO
2 stops16h 45mMultiple Airlines
Thu 11/2711:25 amOPO - SEA
1 stop33h 50mMultiple Airlines
Deal found 8/16$639
This KLM 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1810:15 amPDX - OPO
2 stops16h 15mKLM
Thu 11/2711:15 amOPO - PDX
1 stop32h 10mKLM
Deal found 8/18$641
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.
Fri 11/2811:59 pmPDX - OPO
2 stops25h 31mUnited Airlines
Fri 12/126:00 amOPO - PDX
2 stops26h 44mUnited Airlines
Deal found 8/18$644
This Ovago deal was found by Cheapflights users on 8/17. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/86:50 pmSEA - OPO
1 stop16h 25mBritish Airways
Fri 11/218:20 amOPO - SEA
2 stops22h 58mBritish Airways
Deal found 8/17$646
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/153:54 pmPDX - OPO
2 stops39h 21mLufthansa
Wed 11/2612:30 pmOPO - PDX
2 stops44h 16mLufthansa
Deal found 8/18$646

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington 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 18, 2025.
Use the filters below to find and compare flights from Washington to Porto that are best for you.

Fly from

Washington

Fly to

Porto

Route

Depart

Return

Price

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 11/17

7:00 am-9:30 am

2 stops18h 30m

Porto

Thu 11/27

12:30 pm-12:46 am

2 stops20h 16m

$594

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 11/17

11:59 pm-9:30 am

2 stops25h 31m

Porto

Tue 11/25

6:00 am-12:45 am

2 stops26h 45m

$594

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 11/18

5:00 am-9:30 am

2 stops20h 30m

Porto

Wed 11/26

6:00 am-12:45 am

2 stops26h 45m

$594

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 11/16

11:59 pm-9:30 am

2 stops25h 31m

Porto

Tue 11/25

6:00 am-12:45 am

2 stops26h 45m

$594

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 11/17

11:59 pm-9:30 am

2 stops25h 31m

Porto

Wed 11/26

12:30 pm-12:45 am

2 stops20h 15m

$594

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 11/18

8:30 am-9:30 am

2 stops17h 00m

Porto

Tue 11/25

6:00 am-12:45 am

2 stops26h 45m

$594

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 11/16

11:59 pm-9:30 am

2 stops25h 31m

Porto

Thu 11/27

12:30 pm-12:46 am

2 stops20h 16m

$594

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 11/16

11:59 pm-9:30 am

2 stops25h 31m

Porto

Wed 11/26

6:00 am-12:45 am

2 stops26h 45m

$594

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 11/18

7:00 am-9:30 am

2 stops18h 30m

Porto

Thu 11/27

12:30 pm-12:46 am

2 stops20h 16m

$594

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/19

8:20 am-9:30 am

2 stops17h 10m

Porto

Tue 11/25

6:00 am-12:45 am

2 stops26h 45m

$594

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/15

Showing 1-10 of 33 results
1
2
3
4

Best time to book a flight from Washington to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Washington 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 to Porto

What is the cheapest month to book a flight from State of Washington to Porto?

Currently, January is the cheapest month in which you can book a flight from State of Washington to Porto (average of $523). Flying from State of Washington 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 WA to OPO?

Find hourly flight availability from Washington 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 18, 2025.

When flying from State of Washington to Porto, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Related info for your journey

Find useful and relevant information for your journey from Washington 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?

    Porto (OPO) is the airport you will fly into if you book a flight from Washington to Porto. It is only a 6.8 mi journey from Porto (OPO) to Porto’s city center.

  • How long is the flight from State of Washington to Porto?

    United Airlines, Turkish Airlines, and British Airways can get you from State of Washington to Porto in just under 16h 25m. Your travel time can differ by up to 2h 55m. There are 5083 mi between State of Washington and Porto. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from Washington to Porto that include hotel bookings?

    Yes. In addition to deals on Washington to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Porto.

  • Can I find deals for business class flights from Washington to Porto?

    Yes. Cheapflights offers flight deals from Washington 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 State of Washington to Porto?

    Currently, January is the cheapest month in which you can book a flight from State of Washington to Porto (average of $523). Flying from State of Washington 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Washington to Porto

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Lisbon flights
Newark to Lisbon flights
Boston to Lisbon flights
Dulles Intl to Lisbon flights
LaGuardia to Lisbon flights
Newark to Porto flights
Miami to Lisbon flights
Dallas/Fort Worth to Lisbon flights
San Francisco to Lisbon flights
Seattle to Lisbon flights
O'Hare Intl to Lisbon flights
Boston to Ponta Delgada flights
John F Kennedy Intl to Porto flights
Baltimore to Lisbon flights
Philadelphia to Lisbon flights
Reagan-National to Lisbon flights
LaGuardia to Porto flights
Los Angeles to Lisbon flights
Boston to Porto flights
Cleveland to Lisbon flights
Denver to Lisbon flights
Minneapolis to Lisbon flights
John F Kennedy Intl to Ponta Delgada flights
Atlanta to Lisbon flights
Newark to Ponta Delgada flights
Midway to Lisbon flights
Los Angeles to Porto flights
Tampa to Lisbon flights
Newark to Funchal flights
Dulles Intl to Porto flights
John F Kennedy Intl to Funchal flights
Portland to Lisbon flights
Charlotte to Lisbon flights
Raleigh to Lisbon flights
Newark to Faro flights
John F Kennedy Intl to Faro flights
Seattle to Porto flights
Detroit to Lisbon flights
Boston to Faro flights
Orlando to Lisbon flights
Sky Harbor Intl to Lisbon flights
O'Hare Intl to Porto flights
Hobby to Lisbon flights
Reagan-National to Porto flights
Fort Lauderdale to Lisbon flights
Austin to Lisbon flights
Love Field to Lisbon flights
LaGuardia to Funchal flights
George Bush Intcntl to Lisbon flights
San Diego to Lisbon flights

Top 6 airlines flying from Washington to Porto

Discover the top 6 airlines that operate flights from Washington 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 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$642Average$963FlexibilityNo cancel feeOn-time76%
KLMCheapest$649Average$1,026FlexibilityNo cancel feeOn-time75%
DeltaCheapest$659Average$1,099FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$673Average$914FlexibilityNo cancel feeOn-time70%
Turkish AirlinesCheapest$685Average$833FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$717Average$1,203FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.