$489+ Cheap flights from Porto (OPO) to Seattle (SEA)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Nov 8 — Nov 151
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
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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
Best
Last-minute
One-way
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 October 9, 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 October 9, 2026.
This Mytrip deal was found by Cheapflights users on 10/5. 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.
Thu 10/226:40 am -
2 stops22h 00m
Mon 10/263:35 pm -
2 stops25h 20m
Deal found 10/5![Multiple Airlines logo]()
$815
This Mytrip deal was found by Cheapflights users on 10/8. 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.
Sun 11/82:30 pm -
3 stops34h 30m
Sun 11/152:35 pm -
2 stops25h 20m
Deal found 10/8![Multiple Airlines logo]()
$843
This Mytrip deal was found by Cheapflights users on 10/5. 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.
Mon 10/197:55 pm -
3 stops32h 45m
Mon 10/263:35 pm -
3 stops23h 55m
Deal found 10/5![Multiple Airlines logo]()
$881
This Mytrip deal was found by Cheapflights users on 10/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/237:45 am -
2 stops17h 15m
Mon 11/302:35 pm -
3 stops33h 35m
Deal found 10/9![Multiple Airlines logo]()
$935
This Rumbo deal was found by Cheapflights users on 10/4. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/194:50 pm -
1 stop32h 30m
Fri 10/237:15 pm -
1 stop31h 40m
Deal found 10/4![Turkish Airlines logo]()
$951
This Gotogate deal was found by Cheapflights users on 10/5. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/224:40 pm -
1 stop32h 40m
Mon 10/268:05 pm -
1 stop36h 20m
Deal found 10/5![Turkish Airlines logo]()
$953
This Gotogate deal was found by Cheapflights users on 10/5. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/194:50 pm -
1 stop32h 30m
Mon 10/268:05 pm -
1 stop36h 20m
Deal found 10/5![Turkish Airlines logo]()
$956
This Delta deal was found by Cheapflights users on 10/6. 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 10/225:00 am -
1 stop14h 52m
Mon 10/267:24 am -
2 stops20h 11m
Deal found 10/6![Delta logo]()
$960
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 October 9, 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 October 9, 2026.
This Mytrip deal was found by Cheapflights users on 10/5. 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.
Thu 10/226:40 am -
2 stops22h 00m
Mon 10/263:35 pm -
2 stops25h 20m
Deal found 10/5![Multiple Airlines logo]()
$815
This Turkish Airlines deal was found by Cheapflights users on 10/9. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/234:25 pm -
2 stops38h 42m
Mon 11/307:05 pm -
1 stop36h 20m
Deal found 10/9![Turkish Airlines logo]()
$929
This Scandinavian Airlines deal was found by Cheapflights users on 10/8. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/155:45 pm -
2 stops36h 17m
Sun 1/177:15 am -
2 stops20h 50m
Deal found 10/8![Scandinavian Airlines logo]()
$956
This Delta deal was found by Cheapflights users on 10/6. 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 10/225:00 am -
1 stop14h 52m
Mon 10/267:24 am -
2 stops20h 11m
Deal found 10/6![Delta logo]()
$960
This Mytrip deal was found by Cheapflights users on 10/8. 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.
Sun 11/88:00 pm -
3 stops29h 00m
Sun 11/152:35 pm -
3 stops33h 35m
Deal found 10/8![Multiple Airlines logo]()
$832
This Rumbo deal was found by Cheapflights users on 10/4. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/194:50 pm -
1 stop32h 30m
Fri 10/237:15 pm -
1 stop31h 40m
Deal found 10/4![Turkish Airlines logo]()
$951
Last-minute flights from Porto to SeattleDiscover last-minute flight deals from Porto to Seattle. Data last updated October 9, 2026 and is based on user searches.
Discover last-minute flight deals from Porto to Seattle. Data last updated October 9, 2026 and is based on user searches.
This Mytrip deal was found by Cheapflights users on 10/5. 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.
Mon 10/197:55 pm -
3 stops32h 45m
Mon 10/263:35 pm -
3 stops23h 55m
Deal found 10/5![Multiple Airlines logo]()
$881
This Rumbo deal was found by Cheapflights users on 10/4. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/194:50 pm -
1 stop32h 30m
Fri 10/237:15 pm -
1 stop31h 40m
Deal found 10/4![Turkish Airlines logo]()
$951
This Gotogate deal was found by Cheapflights users on 10/5. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/194:50 pm -
1 stop32h 30m
Mon 10/268:05 pm -
1 stop36h 20m
Deal found 10/5![Turkish Airlines logo]()
$956
This Mytrip deal was found by Cheapflights users on 10/5. 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.
Thu 10/226:40 am -
2 stops22h 00m
Mon 10/263:35 pm -
2 stops25h 20m
Deal found 10/5![Multiple Airlines logo]()
$815
This Gotogate deal was found by Cheapflights users on 10/5. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/224:40 pm -
1 stop32h 40m
Mon 10/268:05 pm -
1 stop36h 20m
Deal found 10/5![Turkish Airlines logo]()
$953
This Delta deal was found by Cheapflights users on 10/6. 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 10/225:00 am -
1 stop14h 52m
Mon 10/267:24 am -
2 stops20h 11m
Deal found 10/6![Delta logo]()
$960
This Mytrip deal was found by Cheapflights users on 10/8. 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.
Sun 11/82:30 pm -
3 stops34h 30m
Sun 11/152:35 pm -
2 stops25h 20m
Deal found 10/8![Multiple Airlines logo]()
$843
This Mytrip deal was found by Cheapflights users on 10/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/237:45 am -
2 stops17h 15m
Mon 11/302:35 pm -
3 stops33h 35m
Deal found 10/9![Multiple Airlines logo]()
$935
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 October 9, 2026.
Search for one-way flight options from Porto to Seattle. Find affordable one-way fares based on user searches. Data last updated October 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/4. 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 11/186:25 am -
2 stops35h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/4![Multiple Airlines logo]()
$489
This Kiwi.com deal was found by Cheapflights users on 10/9. 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.
Thu 10/291:35 pm -
3 stops36h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/9![Multiple Airlines logo]()
$548
This Kiwi.com deal was found by Cheapflights users on 10/6. 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 10/146:30 am -
3 stops43h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/6![Multiple Airlines logo]()
$553
This Kiwi.com deal was found by Cheapflights users on 10/5. 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.
Sun 11/17:30 pm -
3 stops52h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/5![Multiple Airlines logo]()
$584
This Kiwi.com deal was found by Cheapflights users on 10/4. 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 10/275:45 pm -
2 stops55h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/4![Multiple Airlines logo]()
$607
This Kiwi.com deal was found by Cheapflights users on 10/9. 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.
Wed 10/286:10 am -
3 stops43h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/9![Multiple Airlines logo]()
$640
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 October 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $815 (Mytrip) |
One-way from | $489 (Kiwi.com) |
Popular in | July |
Cheapest in | May |
Average price | $977 |
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 7,457,451 searches. Data last updated October 9, 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
6:25 am-10:16 am
2 stops35h 51m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$489
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Wed 10/14
6:30 am-5:55 pm
3 stops43h 25m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$553
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Sun 11/1
7:30 pm-3:55 pm
3 stops52h 25m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$584
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Tue 10/27
5:45 pm-6:00 pm
2 stops55h 15m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$607
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Sun 11/1
4:25 pm-11:07 pm
2 stops38h 42m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$679
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Wed 10/28
10:55 am-3:32 pm
2 stops59h 37m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$693
Quickest round-trip
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Tue 10/27
4:10 pm-6:10 pm
1 stop33h 00m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$761
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Thu 10/22
6:40 am-8:40 pm
2 stops22h 00m
Seattle/Tacoma Intl
Mon 10/26
3:35 pm-11:55 pm
2 stops25h 20m
$815
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Sun 11/8
8:00 pm-5:00 pm
3 stops29h 00m
Seattle/Tacoma Intl
Sun 11/15
2:35 pm-8:10 am
3 stops33h 35m
$832
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Mon 11/23
4:25 pm-11:07 pm
2 stops38h 42m
Seattle/Tacoma Intl
Mon 11/30
7:05 pm-3:25 pm
1 stop36h 20m
$929
Showing 1-10 of 13 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
Centralia
Kent
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