HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Seattle

$384+ 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 5/8. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Feb 19 — Feb 261
Thu 2/19
Thu 2/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Porto to Seattle 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 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 20, 2026.

This Mytrip deal was found by Cheapflights users on 1/20. 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.
Fri 4/176:35 am
OPO
-
SEA
2 stops22h 05m
Multiple Airlines
Fri 4/247:00 pm
SEA
-
OPO
3 stops29h 00m
Multiple Airlines
Deal found 1/20$674
This Iberia deal was found by Cheapflights users on 1/19. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/268:20 am
OPO
-
SEA
2 stops22h 00m
Iberia
Tue 2/38:35 am
SEA
-
OPO
2 stops23h 25m
Iberia
Deal found 1/19$764
This British Airways deal was found by Cheapflights users on 1/20. 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.
Thu 1/298:20 am
OPO
-
SEA
2 stops22h 00m
Multiple Airlines
Tue 2/310:50 am
SEA
-
OPO
2 stops25h 10m
Multiple Airlines
Deal found 1/20$766
This Gurufare deal was found by Cheapflights users on 1/20. 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.
Sun 5/108:20 am
OPO
-
SEA
2 stops23h 19m
Iberia
Mon 5/251:35 pm
SEA
-
OPO
2 stops34h 05m
Iberia
Deal found 1/20$768
This Air France deal was found by Cheapflights users on 1/20. 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.
Sat 5/95:00 am
OPO
-
SEA
1 stop19h 30m
Multiple Airlines
Mon 5/251:30 pm
SEA
-
OPO
1 stop17h 55m
Multiple Airlines
Deal found 1/20$799
This KLM deal was found by Cheapflights users on 1/19. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/2611:15 am
OPO
-
SEA
1 stop32h 35m
Multiple Airlines
Tue 2/39:25 am
SEA
-
OPO
2 stops17h 05m
Multiple Airlines
Deal found 1/19$800
This Delta deal was found by Cheapflights users on 1/20. 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.
Sun 5/105:00 am
OPO
-
SEA
2 stops21h 52m
Delta
Mon 5/251:30 pm
SEA
-
OPO
1 stop17h 55m
Delta
Deal found 1/20$807
This Iberia deal was found by Cheapflights users on 1/20. 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.
Fri 5/88:20 am
OPO
-
SEA
2 stops23h 19m
Iberia
Mon 5/253:09 pm
SEA
-
OPO
2 stops32h 31m
Iberia
Deal found 1/20$816
This Iberia deal was found by Cheapflights users on 1/20. 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 5/912:25 pm
OPO
-
SEA
2 stops31h 10m
Iberia
Mon 5/253:09 pm
SEA
-
OPO
2 stops32h 31m
Iberia
Deal found 1/20$831

Find 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 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
1 star

Round-trip from

$674
(Mytrip)

One-way from

$384
(Kiwi.com)

Popular in

July

Cheapest in

May

Average price

$937
Provider with most accurate pricing for Porto-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Porto-Seattle/Tacoma Intl flights.
Search Deals
From Porto to Seattle/Tacoma Intl
Search Deals
One-way flight from Porto to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($100 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($43 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
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 20, 2026.
Use the filters below to find and compare flights from Porto to Seattle that are best for you.

Fly from

Porto

Fly to

Seattle

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 5/10

8:20 am-11:39 pm

2 stops23h 19m

Seattle/Tacoma Intl

Mon 5/25

1:35 pm-7:40 am

2 stops34h 05m

$768

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 5/11

7:00 pm-11:42 am

1 stop24h 42m

Seattle/Tacoma Intl

Mon 5/25

1:30 pm-3:25 pm

1 stop17h 55m

$799

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 5/10

5:00 am-6:52 pm

2 stops21h 52m

Seattle/Tacoma Intl

Mon 5/25

1:30 pm-3:25 pm

1 stop17h 55m

$807

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 5/11

8:20 am-11:39 pm

2 stops23h 19m

Seattle/Tacoma Intl

Mon 5/25

3:09 pm-7:40 am

2 stops32h 31m

$816

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 5/12

8:20 am-11:39 pm

2 stops23h 19m

Seattle/Tacoma Intl

Mon 5/25

3:09 pm-7:40 am

2 stops32h 31m

$816

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/5

10:20 am-1:20 pm

3 stops35h 00m

Seattle/Tacoma Intl

Thu 3/12

3:00 pm-7:55 am

3 stops33h 55m

$832

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 5/7

6:00 am-9:15 am

2 stops35h 15m

Seattle/Tacoma Intl

Mon 5/25

9:55 am-11:25 am

2 stops41h 30m

$875

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 4/9

5:05 am-9:51 pm

2 stops24h 46m

Seattle/Tacoma Intl

Sat 4/25

3:40 pm-4:00 pm

2 stops16h 20m

$878

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/5

12:30 pm-12:10 pm

1 stop31h 40m

Seattle/Tacoma Intl

Thu 3/12

3:00 pm-2:45 pm

1 stop16h 45m

$886

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/5

6:00 am-7:03 pm

2 stops21h 03m

Seattle/Tacoma Intl

Thu 3/12

3:00 pm-2:45 pm

1 stop16h 45m

$886

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Showing 1-10 of 19 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.

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.

  • How long is the flight from Porto to Seattle?

    There are many flights that can get you from Porto to Seattle in 21h 52m. Fly via Iberia, KLM, or Delta to get the fastest option. Porto and Seattle are separated by a distance of 5083 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 Delta ($707), Lufthansa ($724), and KLM ($726).

  • 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.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Lynnwood
Lacey
Edmonds
Renton
Puyallup
Kirkland
Kent
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis

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 Porto to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
Lisbon to Seattle flights
Lisbon to Portland flights

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.