$444+ 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 12/14. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Nov 13 — Nov 201
Round-trip
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
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 14, 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 14, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/11. 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 11/56:10 am -
1 stop18h 50m
Mon 11/96:45 pm -
1 stop16h 15m
Deal found 10/11![Multiple Airlines logo]()
$679
This Kiwi.com deal was found by Cheapflights users on 10/12. 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.
Mon 11/29:55 pm -
2 stops27h 05m
Mon 11/96:45 pm -
1 stop16h 15m
Deal found 10/12![Multiple Airlines logo]()
$734
This oojo deal was found by Cheapflights users on 10/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/910:55 am -
2 stops44h 12m
Mon 11/167:05 pm -
1 stop30h 50m
Deal found 10/12![Turkish Airlines logo]()
$912
This oojo deal was found by Cheapflights users on 10/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/264:25 pm -
1 stop32h 45m
Thu 12/310:48 am -
2 stops44h 37m
Deal found 10/12![Turkish Airlines logo]()
$926
This Turkish Airlines deal was found by Cheapflights users on 10/13. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/54:25 pm -
2 stops38h 55m
Mon 11/97:05 pm -
1 stop30h 50m
Deal found 10/13![Turkish Airlines logo]()
$927
This Booking.com deal was found by Cheapflights users on 10/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/99:55 pm -
3 stops27h 05m
Mon 11/162:35 pm -
3 stops20h 25m
Deal found 10/12![Multiple Airlines logo]()
$954
This Delta deal was found by Cheapflights users on 10/12. 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.
Mon 11/95:00 am -
1 stop14h 47m
Mon 11/163:25 pm -
1 stop22h 35m
Deal found 10/12![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 14, 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 14, 2026.
This Turkish Airlines deal was found by Cheapflights users on 10/13. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/54:25 pm -
2 stops38h 55m
Mon 11/97:05 pm -
1 stop30h 50m
Deal found 10/13![Turkish Airlines logo]()
$927
This Scandinavian 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 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 10/9![Scandinavian Airlines logo]()
$956
This Delta deal was found by Cheapflights users on 10/13. 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.
Mon 11/95:00 am -
1 stop14h 47m
Mon 11/302:35 pm -
1 stop16h 50m
Deal found 10/13![Delta logo]()
$963
This KLM deal was found by Cheapflights users on 10/14. 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 3/65:00 am -
1 stop14h 35m
Sat 4/31:30 pm -
1 stop17h 55m
Deal found 10/14![KLM logo]()
$970
This Turkish Airlines deal was found by Cheapflights users on 10/12. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/210:55 am -
2 stops44h 12m
Mon 11/91:16 pm -
2 stops42h 09m
Deal found 10/12![Turkish Airlines logo]()
$929
This Delta deal was found by Cheapflights users on 10/12. 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.
Mon 11/95:00 am -
2 stops17h 55m
Mon 11/168:30 am -
2 stops18h 05m
Deal found 10/12![Delta logo]()
$966
This Turkish Airlines deal was found by Cheapflights users on 10/11. 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.
Wed 1/2710:55 am -
1 stop38h 15m
Thu 2/410:52 am -
2 stops44h 33m
Deal found 10/11![Turkish Airlines logo]()
$952
Last-minute flights from Porto to SeattleDiscover last-minute flight deals from Porto to Seattle. Data last updated October 14, 2026 and is based on user searches.
Discover last-minute flight deals from Porto to Seattle. Data last updated October 14, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 10/12. 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.
Mon 11/29:55 pm -
2 stops27h 05m
Mon 11/96:45 pm -
1 stop16h 15m
Deal found 10/12![Multiple Airlines logo]()
$734
This Kiwi.com deal was found by Cheapflights users on 10/11. 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 11/56:10 am -
1 stop18h 50m
Mon 11/96:45 pm -
1 stop16h 15m
Deal found 10/11![Multiple Airlines logo]()
$679
This Turkish Airlines deal was found by Cheapflights users on 10/13. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/54:25 pm -
2 stops38h 55m
Mon 11/97:05 pm -
1 stop30h 50m
Deal found 10/13![Turkish Airlines logo]()
$927
This oojo deal was found by Cheapflights users on 10/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/910:55 am -
2 stops44h 12m
Mon 11/167:05 pm -
1 stop30h 50m
Deal found 10/12![Turkish Airlines logo]()
$912
This Booking.com deal was found by Cheapflights users on 10/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/99:55 pm -
3 stops27h 05m
Mon 11/162:35 pm -
3 stops20h 25m
Deal found 10/12![Multiple Airlines logo]()
$954
This Delta deal was found by Cheapflights users on 10/12. 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.
Mon 11/95:00 am -
1 stop14h 47m
Mon 11/163:25 pm -
1 stop22h 35m
Deal found 10/12![Delta logo]()
$960
This oojo deal was found by Cheapflights users on 10/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/264:25 pm -
1 stop32h 45m
Thu 12/310:48 am -
2 stops44h 37m
Deal found 10/12![Turkish Airlines logo]()
$926
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 14, 2026.
Search for one-way flight options from Porto to Seattle. Find affordable one-way fares based on user searches. Data last updated October 14, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/10. 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.
Mon 12/143:25 pm -
2 stops33h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/10![Multiple Airlines logo]()
$444
This Kiwi.com deal was found by Cheapflights users on 10/11. 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 1/76:40 pm -
3 stops30h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/11![Multiple Airlines logo]()
$512
This Kiwi.com deal was found by Cheapflights users on 10/13. 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.
Sun 3/79:10 am -
3 stops39h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/13![Multiple Airlines logo]()
$515
This Kiwi.com deal was found by Cheapflights users on 10/11. 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 1/1010:25 am -
3 stops38h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/11![Multiple Airlines logo]()
$518
This Kiwi.com deal was found by Cheapflights users on 10/11. 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.
Sat 1/99:50 am -
3 stops39h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/11![Multiple Airlines logo]()
$535
This Kiwi.com deal was found by Cheapflights users on 10/11. 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.
Fri 1/810:10 am -
3 stops38h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/11![Multiple Airlines logo]()
$538
This Kiwi.com deal was found by Cheapflights users on 10/13. 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.
Fri 4/29:50 pm -
3 stops48h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/13![Multiple Airlines logo]()
$541
This Kiwi.com deal was found by Cheapflights users on 10/12. 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.
Mon 11/26:30 am -
3 stops44h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/12![Multiple Airlines logo]()
$554
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 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $679 (Kiwi.com) |
One-way from | $444 (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 14, 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
Mon 12/14
4:25 pm-5:00 pm
3 stops32h 35m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$482
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Sun 3/7
9:10 am-5:00 pm
3 stops39h 50m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$515
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Fri 4/2
9:50 pm-2:40 pm
3 stops48h 50m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$541
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Sat 4/3
9:00 am-7:12 am
3 stops30h 12m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$563
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Fri 12/18
1:25 pm-5:00 pm
3 stops59h 35m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$582
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Mon 12/14
5:00 am-11:50 am
1 stop14h 50m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$629
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Mon 12/7
5:00 am-3:29 pm
2 stops18h 29m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$635
Quickest round-trip
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Sun 3/7
5:00 am-11:35 am
1 stop14h 35m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$643
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Thu 10/29
10:55 am-3:32 pm
2 stops35h 37m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$721
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
Fri 1/8
5:00 am-11:49 am
1 stop14h 49m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$791
Showing 1-10 of 18 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
Renton
Tacoma
Lacey
Leavenworth
Olympia
Tukwila
Snoqualmie
Puyallup
Lynnwood
Centralia
Kent
Tumwater
Ocean Shores
Ellensburg
Issaquah
Lakewood
Poulsbo
Marysville
Shoreline
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
Complete your trip
Flights by cabin class
Other flight options
Other flights from Porto
Popular flights
Seattle flight routes