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$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 4/26. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
abr. 7 — abr. 141
mar. 4/7
mar. 4/14
1 adult, Economy
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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 marzo 8, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/5. 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.
jue. 4/309:50 am
OPO
-
SEA
1 stop17h 33m
Multiple Airlines
lun. 5/47:00 pm
SEA
-
OPO
2 stops37h 25m
Multiple Airlines
Deal found 3/5$813
This Mytrip deal was found by Cheapflights users on 3/5. 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.
lun. 6/18:55 pm
OPO
-
SEA
2 stops27h 05m
Multiple Airlines
lun. 6/155:40 am
SEA
-
OPO
2 stops17h 20m
Multiple Airlines
Deal found 3/5$841
This KLM deal was found by Cheapflights users on 3/5. 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.
jue. 3/1911:15 am
OPO
-
SEA
1 stop32h 20m
KLM
jue. 5/281:30 pm
SEA
-
OPO
1 stop24h 30m
KLM
Deal found 3/5$850
This Delta deal was found by Cheapflights users on 3/5. 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.
jue. 4/305:00 am
OPO
-
SEA
2 stops17h 42m
Delta
lun. 5/47:15 am
SEA
-
OPO
2 stops19h 25m
Delta
Deal found 3/5$859
This Delta deal was found by Cheapflights users on 3/5. 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.
jue. 3/195:00 am
OPO
-
SEA
2 stops21h 48m
Delta
jue. 5/286:40 pm
SEA
-
OPO
1 stop19h 20m
Delta
Deal found 3/5$864
This KLM deal was found by Cheapflights users on 3/7. 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.
jue. 4/24:20 pm
OPO
-
SEA
1 stop32h 10m
Multiple Airlines
lun. 4/66:40 pm
SEA
-
OPO
1 stop19h 20m
Multiple Airlines
Deal found 3/7$881
This Air Canada deal was found by Cheapflights users on 3/3. 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.
mié. 4/156:00 am
OPO
-
SEA
2 stops35h 38m
Air Canada
dom. 4/198:00 pm
SEA
-
OPO
2 stops35h 40m
Air Canada
Deal found 3/3$882
This United Airlines deal was found by Cheapflights users on 3/3. 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.
mié. 4/156:00 am
OPO
-
SEA
2 stops21h 00m
United Airlines
dom. 4/192:10 pm
SEA
-
OPO
1 stop17h 30m
United Airlines
Deal found 3/3$887

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 marzo 8, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$813
(Kiwi.com)

One-way from

$384
(Kiwi.com)

Popular in

July

Cheapest in

May

Average price

$983
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 ($101 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 March 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 marzo 8, 2026.
Use the filters below to find and compare flights from Porto to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoSeattle

OPO - SEA

OPOSEA

Porto

lun. 6/1

8:55 pm-4:00 pm

2 stops27h 05m

Seattle/Tacoma Intl

lun. 6/15

5:40 am-7:00 am

2 stops17h 20m

$841

PortoSeattle

OPO - SEA

OPOSEA

Porto

jue. 3/19

11:15 am-12:35 pm

1 stop32h 20m

Seattle/Tacoma Intl

jue. 5/28

1:30 pm-10:00 pm

1 stop24h 30m

$850
Quickest round-trip

PortoSeattle

OPO - SEA

OPOSEA

Porto

jue. 4/30

5:00 am-2:42 pm

2 stops17h 42m

Seattle/Tacoma Intl

lun. 5/4

7:15 am-10:40 am

2 stops19h 25m

$859

PortoSeattle

OPO - SEA

OPOSEA

Porto

jue. 3/19

5:00 am-7:48 pm

2 stops21h 48m

Seattle/Tacoma Intl

jue. 5/28

6:40 pm-10:00 pm

1 stop19h 20m

$864

PortoSeattle

OPO - SEA

OPOSEA

Porto

jue. 4/2

4:20 pm-4:30 pm

1 stop32h 10m

Seattle/Tacoma Intl

lun. 4/6

6:40 pm-10:00 pm

1 stop19h 20m

$881

PortoSeattle

OPO - SEA

OPOSEA

Porto

mié. 4/15

6:00 am-9:38 am

2 stops35h 38m

Seattle/Tacoma Intl

dom. 4/19

8:00 pm-3:40 pm

2 stops35h 40m

$882

PortoSeattle

OPO - SEA

OPOSEA

Porto

jue. 4/2

5:00 am-4:47 pm

2 stops19h 47m

Seattle/Tacoma Intl

lun. 4/6

7:15 am-10:40 am

2 stops19h 25m

$915

PortoSeattle

OPO - SEA

OPOSEA

Porto

sáb. 4/4

11:45 am-11:45 am

1 stop32h 00m

Seattle/Tacoma Intl

sáb. 4/11

1:30 pm-10:00 pm

1 stop24h 30m

$976

PortoSeattle

OPO - SEA

OPOSEA

Porto

sáb. 4/4

5:00 am-4:49 pm

2 stops19h 49m

Seattle/Tacoma Intl

sáb. 4/11

7:15 am-10:55 am

2 stops19h 40m

$1,001

PortoSeattle

OPO - SEA

OPOSEA

Porto

mié. 4/15

6:00 am-11:27 pm

3 stops25h 27m

Seattle/Tacoma Intl

dom. 4/19

7:00 am-9:45 am

2 stops18h 45m

$1,051

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

Showing 1-10 of 20 resultsSorted by cheapest first
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.

Cheapflights Insights

Everything you need to know about your flight from Porto to Seattle

How much does it cost to fly round-trip from Porto to Seattle?

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 48m. Fly via 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 Lufthansa ($724), KLM ($742), and United Airlines ($948).

  • 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
Kent
Lynnwood
Edmonds
Lacey
Renton
Puyallup
Kirkland
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis

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