$486+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Sep 12 — Sep 191
Round-trip
1 adult, Economy
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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
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Last-minute
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Cheapest flights from Porto to SeattleExplore 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 August 13, 2026.
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 August 13, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/11. 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.
Sun 10/257:45 am -
1 stop17h 20m
Sun 11/16:55 pm -
1 stop16h 50m
Deal found 8/11![Multiple Airlines logo]()
$851
This Mytrip deal was found by Cheapflights users on 8/10. 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.
Thu 9/246:40 am -
2 stops22h 00m
Thu 10/17:00 pm -
2 stops20h 40m
Deal found 8/10![Multiple Airlines logo]()
$919
This Turkish Airlines deal was found by Cheapflights users on 8/10. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/184:25 pm -
2 stops38h 34m
Thu 1/711:00 am -
2 stops44h 25m
Deal found 8/10![Turkish Airlines logo]()
$924
This Turkish Airlines deal was found by Cheapflights users on 8/11. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2510:55 am -
2 stops35h 37m
Sun 11/110:50 am -
2 stops39h 05m
Deal found 8/11![Turkish Airlines logo]()
$925
This KLM deal was found by Cheapflights users on 8/10. 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 9/245:00 am -
1 stop14h 47m
Thu 10/11:30 pm -
1 stop17h 55m
Deal found 8/10![KLM logo]()
$962
This Delta deal was found by Cheapflights users on 8/13. 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 9/275:00 am -
1 stop14h 47m
Sun 10/411:22 am -
2 stops20h 08m
Deal found 8/13![Delta logo]()
$963
This Delta deal was found by Cheapflights users on 8/13. 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 8/275:00 am -
2 stops19h 37m
Sat 9/56:45 pm -
1 stop19h 15m
Deal found 8/13![Delta logo]()
$969
Best flights from Porto to SeattleDiscover carefully curated flight deals from Porto to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 13, 2026.
Discover carefully curated flight deals from Porto to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 13, 2026.
This Turkish Airlines deal was found by Cheapflights users on 8/10. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/184:25 pm -
2 stops38h 34m
Thu 1/711:00 am -
2 stops44h 25m
Deal found 8/10![Turkish Airlines logo]()
$924
This KLM deal was found by Cheapflights users on 8/10. 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 9/245:00 am -
1 stop14h 47m
Thu 10/11:30 pm -
1 stop17h 55m
Deal found 8/10![KLM logo]()
$962
This Air France deal was found by Cheapflights users on 8/13. 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.
Sun 9/275:00 am -
1 stop14h 47m
Sun 10/41:30 pm -
1 stop18h 00m
Deal found 8/13![Multiple Airlines logo]()
$963
This Delta deal was found by Cheapflights users on 8/13. 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 9/275:00 am -
1 stop14h 47m
Sun 10/411:22 am -
2 stops20h 08m
Deal found 8/13![Delta logo]()
$963
This United Airlines deal was found by Cheapflights users on 8/12. 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 10/156:00 am -
2 stops19h 37m
Mon 10/1911:59 pm -
2 stops25h 46m
Deal found 8/12![United Airlines logo]()
$997
This Turkish Airlines deal was found by Cheapflights users on 8/11. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2510:55 am -
2 stops35h 37m
Sun 11/110:50 am -
2 stops39h 05m
Deal found 8/11![Turkish Airlines logo]()
$925
This Delta deal was found by Cheapflights users on 8/12. 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 10/255:00 am -
2 stops21h 05m
Sun 11/16:00 am -
2 stops20h 35m
Deal found 8/12![Delta logo]()
$969
This United Airlines deal was found by Cheapflights users on 8/10. 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.
Fri 11/206:00 am -
2 stops19h 54m
Sat 1/233:51 pm -
3 stops39h 29m
Deal found 8/10![United Airlines logo]()
$1,005
This Delta deal was found by Cheapflights users on 8/13. 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 8/275:00 am -
2 stops19h 37m
Sat 9/56:45 pm -
1 stop19h 15m
Deal found 8/13![Delta logo]()
$969
Last-minute flights from Porto to SeattleDiscover last-minute flight deals from Porto to Seattle. Data last updated August 13, 2026 and is based on user searches.
Discover last-minute flight deals from Porto to Seattle. Data last updated August 13, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 8/10. 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.
Mon 8/2411:25 am -
1 stop32h 12m
Sun 8/306:40 pm -
1 stop19h 20m
Deal found 8/10![Delta logo]()
$1,034
This Delta deal was found by Cheapflights users on 8/13. 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 8/275:00 am -
2 stops19h 37m
Sat 9/56:45 pm -
1 stop19h 15m
Deal found 8/13![Delta logo]()
$969
This Mytrip deal was found by Cheapflights users on 8/10. 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.
Thu 9/246:40 am -
2 stops22h 00m
Thu 10/17:00 pm -
2 stops20h 40m
Deal found 8/10![Multiple Airlines logo]()
$919
This KLM deal was found by Cheapflights users on 8/10. 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 9/245:00 am -
1 stop14h 47m
Thu 10/11:30 pm -
1 stop17h 55m
Deal found 8/10![KLM logo]()
$962
This Delta deal was found by Cheapflights users on 8/10. 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 9/245:00 am -
1 stop19h 35m
Thu 10/16:00 am -
2 stops20h 40m
Deal found 8/10![Delta logo]()
$970
This Delta deal was found by Cheapflights users on 8/13. 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 9/275:00 am -
1 stop14h 47m
Sun 10/411:22 am -
2 stops20h 08m
Deal found 8/13![Delta logo]()
$963
This Flighttix deal was found by Cheapflights users on 8/13. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/276:35 pm -
2 stops34h 02m
Sun 10/45:40 am -
2 stops28h 35m
Deal found 8/13![Multiple Airlines logo]()
$1,008
One-way flights from Porto to SeattleSearch for one-way flight options from Porto to Seattle. Find affordable one-way fares based on user searches. Data last updated August 13, 2026.
Search for one-way flight options from Porto to Seattle. Find affordable one-way fares based on user searches. Data last updated August 13, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/10. 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.
Wed 10/143:15 pm -
3 stops33h 55m
Deal found 8/10![Multiple Airlines logo]()
$486
This Kiwi.com deal was found by Cheapflights users on 8/9. 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.
Mon 9/281:55 pm -
3 stops38h 45m
Deal found 8/9![Multiple Airlines logo]()
$515
This Kiwi.com deal was found by Cheapflights users on 8/9. 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.
Tue 9/89:30 pm -
3 stops32h 10m
Deal found 8/9![Multiple Airlines logo]()
$519
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 10/19:25 pm -
3 stops49h 43m
Deal found 8/12![Multiple Airlines logo]()
$527
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 10/89:25 pm -
2 stops31h 15m
Deal found 8/11![Multiple Airlines logo]()
$529
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
Sat 10/171:55 pm -
3 stops50h 42m
Deal found 8/13![Multiple Airlines logo]()
$557
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
Sat 9/269:50 pm -
3 stops52h 38m
Deal found 8/13![Multiple Airlines logo]()
$562
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 August 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $851 (Kiwi.com) |
One-way from | $486 (Kiwi.com) |
Popular in | July |
Cheapest in | May |
Average price | $962 |
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 August 13, 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
Cheapest round-trip
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Wed 11/18
4:25 pm-10:59 pm
2 stops38h 34m
Seattle/Tacoma Intl
Thu 1/7
11:00 am-3:25 pm
2 stops44h 25m
$924
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Sun 10/25
10:55 am-3:32 pm
2 stops35h 37m
Seattle/Tacoma Intl
Sun 11/1
10:50 am-9:55 am
2 stops39h 05m
$925
Quickest round-trip
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Thu 9/24
5:00 am-11:47 am
1 stop14h 47m
Seattle/Tacoma Intl
Thu 10/1
1:30 pm-3:25 pm
1 stop17h 55m
$962
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Sun 9/27
5:00 am-11:47 am
1 stop14h 47m
Seattle/Tacoma Intl
Sun 10/4
1:30 pm-3:30 pm
1 stop18h 00m
$963
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Sun 9/27
5:00 am-11:47 am
1 stop14h 47m
Seattle/Tacoma Intl
Sun 10/4
11:22 am-3:30 pm
2 stops20h 08m
$963
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Sun 10/25
5:00 am-7:05 pm
2 stops21h 05m
Seattle/Tacoma Intl
Sun 11/1
6:00 am-10:35 am
2 stops20h 35m
$969
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Thu 8/27
5:00 am-4:37 pm
2 stops19h 37m
Seattle/Tacoma Intl
Sat 9/5
6:45 pm-10:00 pm
1 stop19h 15m
$969
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Thu 10/15
6:00 am-5:37 pm
2 stops19h 37m
Seattle/Tacoma Intl
Mon 10/19
11:59 pm-9:45 am
2 stops25h 46m
$997
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Fri 11/20
6:00 am-5:54 pm
2 stops19h 54m
Seattle/Tacoma Intl
Sat 1/23
3:51 pm-3:20 pm
3 stops39h 29m
$1,005
Cheapest one-way
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Wed 10/14
5:45 pm-7:00 pm
1 stop33h 15m
$571
Showing 1-10 of 16 resultsSorted by cheapest first
- 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.
OPO-SEA
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
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.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
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Lynnwood
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Puyallup
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Kent
Ellensburg
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