$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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Jul 20 — Jul 271
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
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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 June 20, 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 June 20, 2026.
This Delta deal was found by Cheapflights users on 6/17. 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 10/15:00 am
OPO
- SEA
1 stop19h 35m
Delta
Sat 10/176:45 pm
SEA
- OPO
1 stop19h 15m
Delta
Deal found 6/17![Delta logo]()
$875
This Mytrip deal was found by Cheapflights users on 6/16. 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.
Tue 7/218:25 am
OPO
- SEA
3 stops33h 42m
Multiple Airlines
Mon 7/277:00 pm
SEA
- OPO
3 stops27h 50m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$926
This Mytrip deal was found by Cheapflights users on 6/16. 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.
Tue 8/188:55 am
OPO
- SEA
2 stops17h 00m
Multiple Airlines
Fri 8/283:40 pm
SEA
- OPO
3 stops32h 20m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$939
This Rumbo deal was found by Cheapflights users on 6/19. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/214:40 pm
OPO
- SEA
1 stop26h 00m
Turkish Airlines
Sat 6/2712:35 pm
SEA
- OPO
1 stop19h 05m
Turkish Airlines
Deal found 6/19![Turkish Airlines logo]()
$973
This oojo deal was found by Cheapflights users on 6/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/1811:00 am
OPO
- SEA
1 stop38h 20m
Turkish Airlines
Mon 6/227:15 pm
SEA
- OPO
1 stop30h 30m
Turkish Airlines
Deal found 6/16![Turkish Airlines logo]()
$981
This United Airlines deal was found by Cheapflights users on 6/16. 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 10/226:00 am
OPO
- SEA
2 stops23h 59m
United Airlines
Mon 10/266:50 am
SEA
- OPO
1 stop19h 40m
United Airlines
Deal found 6/16![United Airlines logo]()
$985
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 June 20, 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 June 20, 2026.
This Delta deal was found by Cheapflights users on 6/17. 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 10/15:00 am
OPO
- SEA
1 stop19h 35m
Delta
Sat 10/1711:50 am
SEA
- OPO
2 stops19h 35m
Delta
Deal found 6/17![Delta logo]()
$875
This Mytrip deal was found by Cheapflights users on 6/16. 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.
Tue 8/188:55 am
OPO
- SEA
2 stops17h 00m
Multiple Airlines
Fri 8/287:00 pm
SEA
- OPO
2 stops20h 40m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$942
This United Airlines deal was found by Cheapflights users on 6/15. 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 10/2212:35 pm
OPO
- SEA
1 stop17h 20m
United Airlines
Mon 10/266:50 am
SEA
- OPO
1 stop19h 40m
United Airlines
Deal found 6/15![United Airlines logo]()
$1,009
This Gotogate deal was found by Cheapflights users on 6/16. 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.
Tue 8/186:20 am
OPO
- SEA
1 stop18h 39m
Lufthansa
Fri 8/282:10 pm
SEA
- OPO
1 stop24h 35m
Lufthansa
Deal found 6/16![Lufthansa logo]()
$1,148
This KLM deal was found by Cheapflights users on 6/20. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/115:00 am
OPO
- SEA
1 stop19h 20m
Multiple Airlines
Wed 7/226:35 pm
SEA
- OPO
1 stop19h 25m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$1,106
This Delta deal was found by Cheapflights users on 6/20. 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.
Sat 7/115:00 am
OPO
- SEA
1 stop19h 20m
Delta
Wed 7/229:30 am
SEA
- OPO
2 stops17h 10m
Delta
Deal found 6/20![Delta logo]()
$1,109
This Delta deal was found by Cheapflights users on 6/17. 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.
Tue 8/185:00 am
OPO
- SEA
1 stop19h 27m
Delta
Fri 8/287:15 am
SEA
- OPO
2 stops19h 25m
Delta
Deal found 6/17![Delta logo]()
$1,121
This Ethiopian Air deal was found by Cheapflights users on 6/17. 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 Ethiopian Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/17:55 pm
OPO
- SEA
4 stops56h 42m
Ethiopian Air
Sat 10/178:10 am
SEA
- OPO
4 stops39h 05m
Ethiopian Air
Deal found 6/17![Ethiopian Air logo]()
$3,306
This Ethiopian Air deal was found by Cheapflights users on 6/16. 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 Ethiopian Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/217:55 pm
OPO
- SEA
4 stops52h 00m
Ethiopian Air
Mon 7/2711:20 pm
SEA
- OPO
3 stops47h 55m
Ethiopian Air
Deal found 6/16![Ethiopian Air logo]()
$3,426
This Delta deal was found by Cheapflights users on 6/17. 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.
Sat 10/35:00 am
OPO
- SEA
2 stops19h 35m
Delta
Sat 10/1711:50 am
SEA
- OPO
2 stops19h 25m
Delta
Deal found 6/17![Delta logo]()
$4,396
Last-minute flights from Porto to SeattleDiscover last-minute flight deals from Porto to Seattle. Data last updated June 20, 2026 and is based on user searches.
Discover last-minute flight deals from Porto to Seattle. Data last updated June 20, 2026 and is based on user searches.
This oojo deal was found by Cheapflights users on 6/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/1811:00 am
OPO
- SEA
1 stop38h 20m
Turkish Airlines
Mon 6/227:15 pm
SEA
- OPO
1 stop30h 30m
Turkish Airlines
Deal found 6/16![Turkish Airlines logo]()
$981
This Delta deal was found by Cheapflights users on 6/16. 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 6/185:00 am
OPO
- SEA
1 stop19h 24m
Delta
Mon 6/229:30 am
SEA
- OPO
2 stops17h 10m
Delta
Deal found 6/16![Delta logo]()
$1,110
This Delta deal was found by Cheapflights users on 6/17. 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.
Fri 6/195:00 am
OPO
- SEA
1 stop14h 37m
Delta
Tue 6/2311:05 am
SEA
- OPO
2 stops20h 20m
Delta
Deal found 6/17![Delta logo]()
$1,105
This Rumbo deal was found by Cheapflights users on 6/19. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/214:40 pm
OPO
- SEA
1 stop26h 00m
Turkish Airlines
Sat 6/2712:35 pm
SEA
- OPO
1 stop19h 05m
Turkish Airlines
Deal found 6/19![Turkish Airlines logo]()
$973
This KLM deal was found by Cheapflights users on 6/20. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/115:00 am
OPO
- SEA
1 stop19h 20m
Multiple Airlines
Wed 7/226:35 pm
SEA
- OPO
1 stop19h 25m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$1,106
This Delta deal was found by Cheapflights users on 6/20. 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.
Sat 7/115:00 am
OPO
- SEA
1 stop19h 20m
Delta
Wed 7/229:30 am
SEA
- OPO
2 stops17h 10m
Delta
Deal found 6/20![Delta logo]()
$1,109
This Mytrip deal was found by Cheapflights users on 6/16. 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.
Tue 7/218:25 am
OPO
- SEA
3 stops33h 42m
Multiple Airlines
Mon 7/277:00 pm
SEA
- OPO
3 stops27h 50m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$926
This Booking.com deal was found by Cheapflights users on 6/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/214:50 pm
OPO
- SEA
1 stop32h 30m
Turkish Airlines
Mon 7/2712:35 pm
SEA
- OPO
1 stop19h 15m
Turkish Airlines
Deal found 6/16![Turkish Airlines logo]()
$1,057
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 June 20, 2026.
Search for one-way flight options from Porto to Seattle. Find affordable one-way fares based on user searches. Data last updated June 20, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2010:20 pm
OPO
- SEA
3 stops43h 20m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$486
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/308:15 pm
OPO
- SEA
3 stops52h 55m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$511
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 9/710:40 pm
OPO
- SEA
3 stops43h 00m
Multiple Airlines
Deal found 6/17![Multiple Airlines logo]()
$515
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 9/810:25 pm
OPO
- SEA
3 stops43h 15m
Multiple Airlines
Deal found 6/17![Multiple Airlines logo]()
$518
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/195:55 pm
OPO
- SEA
3 stops47h 45m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$520
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/275:55 am
OPO
- SEA
3 stops58h 35m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$528
This Iberia deal was found by Cheapflights users on 6/20. 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.
Wed 9/308:20 am
OPO
- SEA
2 stops21h 16m
Iberia
Deal found 6/20![Iberia logo]()
$550
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/218:25 am
OPO
- SEA
3 stops33h 15m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$560
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/235:55 am
OPO
- SEA
3 stops42h 05m
Multiple Airlines
Deal found 6/20![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 June 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $875 (Delta) |
One-way from | $486 (Kiwi.com) |
Popular in | March |
Cheapest in | May |
Average price | $852 |
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 June 20, 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 - SEA
OPOSEA
Porto
Thu 10/1
5:00 am-4:35 pm
1 stop19h 35m
Seattle/Tacoma Intl
Sat 10/17
11:50 am-3:25 pm
2 stops19h 35m
$875
PortoSeattle
OPO - SEA
OPOSEA
Porto
Tue 8/18
8:55 am-5:55 pm
2 stops17h 00m
Seattle/Tacoma Intl
Fri 8/28
7:00 pm-11:40 pm
2 stops20h 40m
$942
PortoSeattle
OPO - SEA
OPOSEA
Porto
Thu 10/22
12:35 pm-9:55 pm
1 stop17h 20m
Seattle/Tacoma Intl
Mon 10/26
6:50 am-9:30 am
1 stop19h 40m
$1,009
PortoSeattle
OPO - SEA
OPOSEA
Porto
Sat 7/11
5:00 am-4:20 pm
1 stop19h 20m
Seattle/Tacoma Intl
Wed 7/22
6:35 pm-10:00 pm
1 stop19h 25m
$1,106
Quickest round-trip
PortoSeattle
OPO - SEA
OPOSEA
Porto
Sat 7/11
5:00 am-4:20 pm
1 stop19h 20m
Seattle/Tacoma Intl
Wed 7/22
9:30 am-10:40 am
2 stops17h 10m
$1,109
PortoSeattle
OPO - SEA
OPOSEA
Porto
Tue 8/18
5:00 am-4:27 pm
1 stop19h 27m
Seattle/Tacoma Intl
Fri 8/28
7:15 am-10:40 am
2 stops19h 25m
$1,121
PortoSeattle
OPO - SEA
OPOSEA
Porto
Tue 8/18
6:20 am-4:59 pm
1 stop18h 39m
Seattle/Tacoma Intl
Fri 8/28
2:10 pm-10:45 pm
1 stop24h 35m
$1,148
PortoSeattle
OPO - SEA
OPOSEA
Porto
Thu 10/1
7:55 pm-8:37 pm
4 stops56h 42m
Seattle/Tacoma Intl
Sat 10/17
8:10 am-7:15 am
4 stops39h 05m
$3,306
PortoSeattle
OPO - SEA
OPOSEA
Porto
Tue 7/21
7:55 pm-3:55 pm
4 stops52h 00m
Seattle/Tacoma Intl
Mon 7/27
11:20 pm-7:15 am
3 stops47h 55m
$3,426
PortoSeattle
OPO - SEA
OPOSEA
Porto
Sat 10/3
5:00 am-4:35 pm
2 stops19h 35m
Seattle/Tacoma Intl
Sat 10/17
11:50 am-3:15 pm
2 stops19h 25m
$4,396
Showing 1-10 of 17 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.
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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Puyallup
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Lynnwood
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Fife
Lakewood
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Shoreline
Marysville
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Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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