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$628+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Apr 27 — May 41
Sun 4/27
Sun 5/4
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 April 22, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$800
(Gotogate)

One-way from

$628
(Expedia)

Popular in

June

Cheapest in

October

Average price

$836
Provider with most accurate pricing for Porto-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Porto-Seattle/Tacoma Intl flights.
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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. 14% potential increase in price ($150 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 22, 2025.

This Gotogate deal was found by Cheapflights users on 4/22. 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.
Fri 5/235:55 pmOPO - SEA
1 stop27h 55mScandinavian Airlines
Sat 5/314:00 pmSEA - OPO
1 stop35h 10mScandinavian Airlines
Deal found 4/22$800
This KLM deal was found by Cheapflights users on 4/22. 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.
Thu 10/305:00 amOPO - SEA
1 stop14h 50mKLM
Thu 11/131:35 pmSEA - OPO
1 stop13h 15mKLM
Deal found 4/22$832
This Air France deal was found by Cheapflights users on 4/22. 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.
Thu 10/305:00 amOPO - SEA
1 stop14h 50mMultiple Airlines
Thu 11/139:55 amSEA - OPO
2 stops16h 55mMultiple Airlines
Deal found 4/22$837
This Air Canada deal was found by Cheapflights users on 4/22. 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.
Fri 6/66:00 amOPO - SEA
2 stops36h 51mAir Canada
Fri 6/137:15 pmSEA - OPO
2 stops30h 20mAir Canada
Deal found 4/22$845
This Delta deal was found by Cheapflights users on 4/22. 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 6/66:40 amOPO - SEA
2 stops23h 41mDelta
Fri 6/131:55 pmSEA - OPO
1 stop20h 15mDelta
Deal found 4/22$850
This United Airlines deal was found by Cheapflights users on 4/22. 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 6/76:00 amOPO - SEA
2 stops23h 58mUnited Airlines
Sat 6/145:15 amSEA - OPO
2 stops20h 20mUnited Airlines
Deal found 4/22$861
This Gurufare deal was found by Cheapflights users on 4/22. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/2312:10 pmOPO - SEA
1 stop32h 15mLufthansa
Fri 6/276:50 pmSEA - OPO
1 stop20h 30mLufthansa
Deal found 4/22$1,235
This Trip.com deal was found by Cheapflights users on 4/22. 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 10/304:55 pmOPO - SEA
1 stop26h 25mBritish Airways
Fri 10/317:50 pmSEA - OPO
1 stop16h 25mBritish Airways
Deal found 4/22$1,384
This SmartFares deal was found by Cheapflights users on 4/21. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1810:50 amOPO - SEA
1 stop31h 45mTurkish Airlines
Sun 6/297:10 pmSEA - OPO
1 stop36h 40mTurkish Airlines
Deal found 4/21$2,950

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 April 22, 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

Fri 5/23

5:55 pm-1:50 pm

1 stop27h 55m

Seattle/Tacoma Intl

Sat 5/31

4:00 pm-11:10 am

1 stop35h 10m

$800

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 6/6

6:40 am-3:55 pm

1 stop17h 15m

Seattle/Tacoma Intl

Fri 6/13

1:55 pm-6:10 pm

1 stop20h 15m

$838

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 6/6

6:00 am-10:51 am

2 stops36h 51m

Seattle/Tacoma Intl

Fri 6/13

7:15 pm-9:35 am

2 stops30h 20m

$845

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 6/6

6:40 am-10:21 pm

2 stops23h 41m

Seattle/Tacoma Intl

Fri 6/13

1:55 pm-6:10 pm

1 stop20h 15m

$850

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 6/7

6:00 am-12:25 pm

1 stop14h 25m

Seattle/Tacoma Intl

Sat 6/14

7:20 am-9:35 am

1 stop18h 15m

$856

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 6/7

6:00 am-9:58 pm

2 stops23h 58m

Seattle/Tacoma Intl

Sat 6/14

5:15 am-9:35 am

2 stops20h 20m

$861

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 6/23

12:10 pm-12:25 pm

1 stop32h 15m

Seattle/Tacoma Intl

Fri 6/27

6:50 pm-11:20 pm

1 stop20h 30m

$1,235

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 6/18

10:50 am-10:35 am

1 stop31h 45m

Seattle/Tacoma Intl

Sun 6/29

7:10 pm-3:50 pm

1 stop36h 40m

$2,950

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 10/14

12:35 pm-10:39 am

2 stops30h 04m

$628

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 10/14

10:50 am-5:15 pm

1 stop38h 25m

$688

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/21

Showing 1-10 of 14 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

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 July is currently the most expensive (average of $411). 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.

Rainfall in Washington by month

Plan your trip to Washington by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in State of Washington ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit State of Washington when rainfall is around 0.7 in.

Temperature in Washington by month

Plan your trip to Washington by taking into account the average temperature totals by month.

If weather is an important factor for your trip to State of Washington, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. 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 Washington. Reviews last updated April 22, 2025.
Delta
8.0
Very good
7,920 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,920 reviews
Delta
8.0
Very good
7,920 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,331 reviews
Delta
8.0
Very good
7,920 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,683 reviews
Delta
8.0
Very good
7,920 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Turkish Airlines
7.3
Good
3,773 reviews
Delta
8.0
Very good
7,920 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Scandinavian Airlines
7.3
Good
1,342 reviews
Delta
8.0
Very good
7,920 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

  • What are the cheapest airlines to fly from Porto to State of Washington one-way?

    To fly one-way, consider booking your trip with Turkish Airlines, which is currently one of the cheapest options available, starting at $688. United Airlines flights start at $981 while deals on Delta start at $1,057 one-way.

  • 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 July is currently the most expensive (average of $411). 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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Alternative routes for Porto to Washington

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Top airline flying from Porto to Washington

Discover the top airline that operate flights from Porto to Washington. 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 April 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$756Average$848FlexibilityNo cancel feeOn-time75%

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