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$495+ Cheap flights from Washington to Porto (OPO)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/26. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — OPO
Nov 18 — Nov 251
Tue 11/18
Tue 11/25
1 adult, Economy
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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 October 19, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/263:10 pmSEA - OPO
1 stop14h 05mMultiple Airlines
Wed 12/312:10 pmOPO - SEA
2 stops43h 05mMultiple Airlines
Deal found 10/18$495
This Kiwi.com deal was found by Cheapflights users on 10/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/263:10 pmSEA - OPO
1 stop24h 30mLufthansa
Wed 12/34:15 pmOPO - SEA
1 stop27h 55mLufthansa
Deal found 10/18$502
This United deal was found by Cheapflights users on 10/17. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/236:00 amSEA - OPO
1 stop19h 30mMultiple Airlines
Sun 12/76:15 amOPO - SEA
1 stop15h 05mMultiple Airlines
Deal found 10/17$522
This KAYAK deal was found by Cheapflights users on 10/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/151:20 pmSEA - OPO
2 stops21h 15mSWISS
Mon 12/1512:05 pmOPO - SEA
2 stops42h 23mSWISS
Deal found 10/17$525
This United deal was found by Cheapflights users on 10/19. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/244:02 pmPDX - OPO
2 stops33h 28mMultiple Airlines
Sun 12/76:15 amOPO - PDX
2 stops20h 15mMultiple Airlines
Deal found 10/19$525
This KLM deal was found by Cheapflights users on 10/18. 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 12/21:40 pmSEA - OPO
1 stop12h 50mKLM
Tue 12/94:10 pmOPO - SEA
1 stop27h 40mKLM
Deal found 10/18$527
This Air France deal was found by Cheapflights users on 10/19. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/32:05 pmSEA - OPO
1 stop36h 20mMultiple Airlines
Wed 12/1011:15 amOPO - SEA
1 stop32h 35mMultiple Airlines
Deal found 10/19$528
This Booking.com deal was found by Cheapflights users on 10/18. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/23:40 pmSEA - OPO
2 stops36h 00mLufthansa
Tue 12/96:00 amOPO - SEA
2 stops22h 54mLufthansa
Deal found 10/18$530
This Air France deal was found by Cheapflights users on 10/18. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/29:30 amSEA - OPO
2 stops17h 00mMultiple Airlines
Tue 12/911:15 amOPO - SEA
1 stop32h 35mMultiple Airlines
Deal found 10/18$531
This Delta deal was found by Cheapflights users on 10/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1411:15 pmPDX - OPO
2 stops27h 15mDelta
Thu 12/411:15 amOPO - PDX
1 stop32h 10mDelta
Deal found 10/17$531
This Delta deal was found by Cheapflights users on 10/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/141:25 pmPDX - OPO
1 stop13h 05mDelta
Sun 12/75:00 amOPO - PDX
1 stop14h 25mDelta
Deal found 10/17$532
This Delta deal was found by Cheapflights users on 10/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/151:40 pmSEA - OPO
1 stop12h 50mDelta
Mon 12/156:30 amOPO - SEA
2 stops22h 20mDelta
Deal found 10/17$536

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 October 19, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$495
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$734
Provider with most accurate pricing for Seattle/Tacoma Intl-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Porto flights.
Search Deals
From Washington to Porto
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($226 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 19, 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

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 12/3

5:50 am-11:40 am

2 stops21h 50m

Porto

Wed 12/10

12:30 pm-12:10 pm

1 stop31h 40m

$530

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 1/10

5:30 am-10:30 am

2 stops21h 00m

Porto

Thu 1/22

11:15 am-11:25 am

1 stop32h 10m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 11/15

5:30 am-10:30 am

2 stops21h 00m

Porto

Thu 12/4

11:15 am-11:25 am

1 stop32h 10m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 1/6

5:30 am-10:30 am

2 stops21h 00m

Porto

Thu 1/22

11:15 am-11:25 am

1 stop32h 10m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Fri 11/14

11:15 pm-10:30 am

2 stops27h 15m

Porto

Sun 12/7

11:15 am-11:25 am

1 stop32h 10m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Fri 11/14

1:25 pm-10:30 am

1 stop13h 05m

Porto

Thu 12/4

11:15 am-11:25 am

1 stop32h 10m

$532

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 11/24

1:25 pm-3:25 pm

1 stop18h 00m

Porto

Sun 12/7

5:00 am-11:25 am

1 stop14h 25m

$532

PortlandPorto

PDX - OPO

PDXOPO

Portland

Thu 1/8

10:15 am-1:20 pm

2 stops19h 05m

Porto

Thu 1/22

4:10 pm-11:25 am

1 stop27h 15m

$536

PortlandPorto

PDX - OPO

PDXOPO

Portland

Thu 1/8

11:10 am-1:20 pm

2 stops18h 10m

Porto

Tue 1/20

4:10 pm-11:25 am

1 stop27h 15m

$536

PortlandPorto

PDX - OPO

PDXOPO

Portland

Fri 11/14

10:52 am-9:30 am

2 stops14h 38m

Porto

Fri 12/5

6:00 am-10:15 pm

2 stops24h 15m

$537

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/17

Showing 1-10 of 34 results
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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, November is the cheapest month in which you can book a flight from State of Washington to Porto (average of $625). Flying from State of Washington to Porto in June is currently the most expensive (average of $1,000). 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 October 19, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 24% on flights from State of Washington to Porto by exploring options for tickets in the evening.

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?

    Delta, Lufthansa, and United Airlines can get you from State of Washington to Porto in just under 19h 30m. Your travel time can differ by up to 4h 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, November is the cheapest month in which you can book a flight from State of Washington to Porto (average of $625). Flying from State of Washington to Porto in June is currently the most expensive (average of $1,000). 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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Alternative routes for Washington to Porto

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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 October 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$642Average$949FlexibilityNo cancel feeOn-time76%
DeltaCheapest$647Average$1,072FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$659Average$1,030FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$685Average$841FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$707Average$1,199FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$741Average$1,174FlexibilityNo cancel feeOn-time70%

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