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$368+ Cheap flights from Porto (OPO) to Seattle (SEA)

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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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Cheap flight deals from Porto to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Porto (OPO) to Seattle (SEA). 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 January 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$701
(Gotogate)

One-way from

$368
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$907
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 Seattle/Tacoma Intl
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One-way flight from Porto to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 21% potential increase in price ($251 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($51 potential savings vs. average RT price).
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Average for round-trip flights in January 2025
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Find flight deals from Porto to Seattle

Cheapest flights from Porto to Seattle
Explore the most affordable flight options available from Porto to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 30, 2025.

This Gotogate deal was found by Cheapflights users on 1/30. 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 5/305:55 pmOPO - SEA
1 stop27h 55mScandinavian Airlines
Sat 6/74:00 pmSEA - OPO
1 stop35h 10mScandinavian Airlines
Deal found 1/30$701
This Trip.com deal was found by Cheapflights users on 1/30. 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.
Fri 5/306:00 amOPO - SEA
2 stops19h 50mMultiple Airlines
Sun 6/83:45 pmSEA - OPO
2 stops23h 20mMultiple Airlines
Deal found 1/30$716
This Air Canada deal was found by Cheapflights users on 1/30. 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 5/306:00 amOPO - SEA
2 stops37h 16mAir Canada
Sat 6/77:15 pmSEA - OPO
2 stops30h 30mAir Canada
Deal found 1/30$779
This Expedia deal was found by Cheapflights users on 1/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/306:15 amOPO - SEA
1 stop18h 44mLufthansa
Sun 6/82:55 pmSEA - OPO
2 stops34h 50mLufthansa
Deal found 1/30$784
This United Airlines deal was found by Cheapflights users on 1/30. 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 3/26:00 amOPO - SEA
2 stops24h 42mUnited Airlines
Sat 3/86:15 amSEA - OPO
3 stops45h 20mUnited Airlines
Deal found 1/30$796
This Gotogate deal was found by Cheapflights users on 1/30. 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.
Sun 3/164:30 pmOPO - SEA
1 stop32h 35mTurkish Airlines
Sun 3/238:00 pmSEA - OPO
1 stop36h 10mTurkish Airlines
Deal found 1/30$834
This Delta deal was found by Cheapflights users on 1/29. 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.
Thu 7/36:30 amOPO - SEA
1 stop17h 25mDelta
Tue 11/181:35 pmSEA - OPO
1 stop13h 15mDelta
Deal found 1/29$996
This Justfly.com deal was found by Cheapflights users on 1/29. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/67:20 pmOPO - SEA
1 stop27h 35mSWISS
Thu 11/201:55 pmSEA - OPO
2 stops20h 45mSWISS
Deal found 1/29$1,121
This British Airways deal was found by Cheapflights users on 1/29. 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.
Sat 7/510:40 amOPO - SEA
1 stop32h 50mBritish Airways
Fri 11/216:50 pmSEA - OPO
1 stop16h 25mBritish Airways
Deal found 1/29$1,137

Find flights from Porto to Seattle within your budget

Customize your flight search to find flights from Porto to Seattle 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 January 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 5/30

5:55 pm-1:50 pm

1 stop27h 55m

Seattle/Tacoma Intl

Sat 6/7

4:00 pm-11:10 am

1 stop35h 10m

$701

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 5/30

6:00 am-5:50 pm

2 stops19h 50m

Seattle/Tacoma Intl

Sun 6/8

3:45 pm-11:05 pm

2 stops23h 20m

$716

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 5/30

6:00 am-11:16 am

2 stops37h 16m

Seattle/Tacoma Intl

Sat 6/7

7:15 pm-9:45 am

2 stops30h 30m

$779

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 5/30

6:15 am-4:59 pm

1 stop18h 44m

Seattle/Tacoma Intl

Sun 6/8

2:55 pm-9:45 am

2 stops34h 50m

$784

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 3/2

6:00 am-10:42 pm

2 stops24h 42m

Seattle/Tacoma Intl

Sat 3/8

6:15 am-11:35 am

3 stops45h 20m

$796

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 3/16

4:30 pm-6:05 pm

1 stop32h 35m

Seattle/Tacoma Intl

Sun 3/23

8:00 pm-3:10 pm

1 stop36h 10m

$834

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 7/3

6:30 am-3:55 pm

1 stop17h 25m

Seattle/Tacoma Intl

Tue 11/18

1:35 pm-10:50 am

1 stop13h 15m

$996

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 7/6

7:20 pm-2:55 pm

1 stop27h 35m

Seattle/Tacoma Intl

Thu 11/20

1:55 pm-6:40 pm

2 stops20h 45m

$1,121

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 7/5

10:40 am-11:30 am

1 stop32h 50m

Seattle/Tacoma Intl

Fri 11/21

6:50 pm-7:15 pm

1 stop16h 25m

$1,137

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 4/9

9:20 am-6:56 pm

2 stops41h 36m

$368

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

Showing 1-10 of 13 results
1
2
  • Most accurate provider: When it comes to deals on Porto-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Porto-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Porto-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Porto-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Porto-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Porto to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle 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.

Travel insights for flights from Porto to Seattle

Get recent, data-driven insights about flights from Porto to Seattle including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Porto to Seattle?

Currently, January is the cheapest month in which you can book a flight from Porto to Seattle (average of $238). Flying from Porto to Seattle 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 Seattle by month

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

In terms of precipitation, rainfall in Seattle 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 Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

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

If weather is an important factor for your trip to Seattle, 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 Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated January 30, 2025.
Delta
8.0
Very good
8,454 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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
8,454 reviews
Delta
8.0
Very good
8,454 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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

SWISS
7.5
Good
1,584 reviews
Delta
8.0
Very good
8,454 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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
8,913 reviews
Delta
8.0
Very good
8,454 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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
3,904 reviews
Delta
8.0
Very good
8,454 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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
1,315 reviews
Delta
8.0
Very good
8,454 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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 Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Porto to Seattle round-trip?

    Currently priced at $701, Scandinavian Airlines will fly you from Porto to Seattle and back. In addition to Scandinavian Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air Canada and Lufthansa - these airlines can fly you to your destination from $779 and $784, respectively. Users have found that Scandinavian Airlines is 22% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Porto to Seattle one-way?

    The cheapest airlines for a one-way flight from Porto to Seattle are Turkish Airlines ($640), Iberia ($666), and United Airlines ($892).

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Porto to Seattle 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 Seattle?

    Currently, January is the cheapest month in which you can book a flight from Porto to Seattle (average of $238). Flying from Porto to Seattle 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

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
SeaTac
Tukwila
Renton
Tacoma
Lacey
Federal Way
Ocean Shores
Leavenworth
Olympia
Marysville
Centralia
Cle Elum
Mukilteo
Aberdeen
Lakewood
Issaquah
Shoreline
Lynnwood
Shelton
Silverdale

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Alternative routes for Porto to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Porto to Seattle

Discover the top airline that operate flights from Porto to Seattle. 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 January 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$756Average$968FlexibilityNo cancel feeOn-time75%
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