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$435+ Cheap flights from Porto (OPO) to Washington

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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheap flight deals from Porto to Washington

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

Round-trip from

$682
(Trip.com)

One-way from

$435
(Kiwi.com)

Popular in

August

Cheapest in

October

Average price

$1,054
From Porto to Washington
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One-way flight from Porto to Washington
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Highest demand for flights based on searches. 11% potential increase in price ($114 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Porto to Washington

Cheapest flights from Porto to Washington
Explore the most affordable flight options available from Porto to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/48:05 amOPO - SEA
2 stops20h 35mMultiple Airlines
Mon 9/83:45 pmSEA - OPO
2 stops19h 00mMultiple Airlines
Deal found 8/16$682
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/96:05 pmOPO - SEA
1 stop36h 34mMultiple Airlines
Wed 10/151:02 pmSEA - OPO
2 stops21h 58mMultiple Airlines
Deal found 8/16$779
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:00 amOPO - SEA
1 stop13h 55mUnited Airlines
Mon 9/87:15 amSEA - OPO
1 stop18h 20mUnited Airlines
Deal found 8/16$821
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/96:00 amOPO - SEA
2 stops20h 36mAir Canada
Wed 10/1510:00 amSEA - OPO
2 stops24h 30mAir Canada
Deal found 8/16$824
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/306:20 amOPO - SEA
2 stops22h 20mMultiple Airlines
Tue 10/73:45 pmSEA - OPO
2 stops19h 05mMultiple Airlines
Deal found 8/16$826
This Lufthansa 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:00 amOPO - SEA
2 stops20h 49mLufthansa
Mon 9/810:00 amSEA - OPO
2 stops15h 35mLufthansa
Deal found 8/16$828
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/1512:30 pmOPO - SEA
2 stops31h 15mUnited Airlines
Tue 1/65:07 amSEA - OPO
2 stops25h 38mUnited Airlines
Deal found 8/16$835
This Lufthansa 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/306:00 amOPO - SEA
1 stop13h 55mLufthansa
Tue 10/72:20 pmSEA - OPO
1 stop17h 25mLufthansa
Deal found 8/16$839
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/306:00 amOPO - SEA
1 stop13h 55mUnited Airlines
Tue 10/76:35 amSEA - OPO
2 stops19h 10mUnited Airlines
Deal found 8/16$840

Cheapflights Fare Finder

 
Customize your flight search to find flights from Porto to Washington 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 Porto to Washington that are best for you.

Fly from

Porto

Fly to

Washington

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 9/4

8:05 am-8:40 pm

2 stops20h 35m

Seattle/Tacoma Intl

Mon 9/8

3:45 pm-6:45 pm

2 stops19h 00m

$682

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/9

6:05 pm-10:39 pm

1 stop36h 34m

Seattle/Tacoma Intl

Wed 10/15

1:02 pm-7:00 pm

2 stops21h 58m

$779

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 9/4

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Mon 9/8

7:15 am-9:35 am

1 stop18h 20m

$821

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 9/4

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Mon 9/8

10:00 am-9:35 am

2 stops15h 35m

$822

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/9

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Wed 10/15

12:00 pm-9:45 am

1 stop13h 45m

$822

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/9

6:00 am-6:36 pm

2 stops20h 36m

Seattle/Tacoma Intl

Wed 10/15

10:00 am-6:30 pm

2 stops24h 30m

$824

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 9/8

7:25 pm-8:35 pm

3 stops57h 10m

$435

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 10/1

7:15 am-10:08 pm

3 stops46h 53m

$460

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 11/1

8:00 pm-1:13 pm

3 stops48h 13m

$479

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 9/6

9:15 pm-12:30 am

3 stops59h 15m

$532

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 11 results
1
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Best time to book a flight from Porto to Washington

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

How much does it cost to fly round-trip from Porto to State of Washington?

Related info for your journey

Find useful and relevant information for your journey from Porto to Washington. 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 from for flights from Porto to Washington?

    Most people fly from Porto (OPO) if they book a flight from Porto to Washington. Porto is conveniently located just 6.8 mi from Porto’s city center.

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

    There are many flights that can get you from Porto to State of Washington in 13h 55m. Fly via United Airlines to get the fastest option. The distance from Porto to State of Washington is about 5083 mi.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Porto to State of Washington (average of $238). Flying from Porto to State of Washington in June is currently the most expensive (average of $388). 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

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