$499+ 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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
sep. 5 — sep. 121
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 agosto 6, 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 agosto 6, 2026.
This Mytrip deal was found by Cheapflights users on 8/4. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/106:40 am -
2 stops22h 00m
lun. 9/217:00 pm -
2 stops20h 20m
Deal found 8/4![Multiple Airlines logo]()
$917
This Turkish Airlines deal was found by Cheapflights users on 8/3. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/214:40 pm -
2 stops38h 16m
mié. 11/410:50 am -
2 stops44h 35m
Deal found 8/3![Turkish Airlines logo]()
$921
This Travelis deal was found by Cheapflights users on 8/3. 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 Travelis is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/204:20 pm -
1 stop27h 27m
dom. 9/276:45 pm -
1 stop19h 15m
Deal found 8/3![Multiple Airlines logo]()
$932
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/105:00 am -
1 stop14h 47m
lun. 9/216:45 pm -
1 stop19h 15m
Deal found 8/4![Delta logo]()
$962
This Delta deal was found by Cheapflights users on 8/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/215:00 am -
1 stop19h 35m
mié. 11/43:25 pm -
1 stop22h 35m
Deal found 8/3![Delta logo]()
$963
This Mytrip deal was found by Cheapflights users on 8/4. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/110:00 pm -
3 stops30h 40m
mar. 9/83:40 pm -
2 stops24h 00m
Deal found 8/4![Multiple Airlines logo]()
$965
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/85:00 am -
2 stops21h 36m
lun. 9/146:45 pm -
1 stop19h 45m
Deal found 8/4![Delta logo]()
$967
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/16:15 am -
1 stop19h 28m
mar. 9/86:45 pm -
1 stop19h 20m
Deal found 8/4![Delta logo]()
$968
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 agosto 6, 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 agosto 6, 2026.
This Turkish Airlines deal was found by Cheapflights users on 8/3. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/2110:45 am -
1 stop38h 35m
mié. 11/410:50 am -
2 stops44h 35m
Deal found 8/3![Turkish Airlines logo]()
$961
This United Airlines deal was found by Cheapflights users on 8/3. 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.
vie. 11/136:00 am -
3 stops25h 18m
lun. 11/168:09 am -
2 stops17h 21m
Deal found 8/3![United Airlines logo]()
$996
This Trip.com deal was found by Cheapflights users on 8/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/244:20 pm -
1 stop27h 17m
dom. 8/306:40 pm -
1 stop19h 20m
Deal found 8/5![Multiple Airlines logo]()
$1,015
This United Airlines deal was found by Cheapflights users on 8/3. 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.
jue. 9/176:00 am -
2 stops20h 41m
jue. 9/242:10 pm -
1 stop17h 35m
Deal found 8/3![United Airlines logo]()
$1,002
This United Airlines deal was found by Cheapflights users on 8/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/2412:10 pm -
1 stop31h 45m
dom. 8/3011:04 pm -
2 stops26h 41m
Deal found 8/5![United Airlines logo]()
$1,011
Last-minute flights from Porto to SeattleDiscover last-minute flight deals from Porto to Seattle. Data last updated agosto 6, 2026 and is based on user searches.
Discover last-minute flight deals from Porto to Seattle. Data last updated agosto 6, 2026 and is based on user searches.
This Flighttix deal was found by Cheapflights users on 8/5. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/244:35 pm -
1 stop27h 20m
dom. 8/303:00 pm -
2 stops32h 00m
Deal found 8/5![Multiple Airlines logo]()
$999
This Mytrip deal was found by Cheapflights users on 8/4. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/110:00 pm -
3 stops30h 40m
mar. 9/83:40 pm -
2 stops24h 00m
Deal found 8/4![Multiple Airlines logo]()
$965
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/16:15 am -
1 stop19h 28m
mar. 9/86:45 pm -
1 stop19h 20m
Deal found 8/4![Delta logo]()
$968
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/85:00 am -
2 stops21h 36m
lun. 9/146:45 pm -
1 stop19h 45m
Deal found 8/4![Delta logo]()
$967
This Mytrip deal was found by Cheapflights users on 8/4. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/106:40 am -
2 stops22h 00m
lun. 9/217:00 pm -
2 stops20h 20m
Deal found 8/4![Multiple Airlines logo]()
$917
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/105:00 am -
1 stop14h 47m
lun. 9/216:45 pm -
1 stop19h 15m
Deal found 8/4![Delta logo]()
$962
This Travelis deal was found by Cheapflights users on 8/3. 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 Travelis is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/204:20 pm -
1 stop27h 27m
dom. 9/276:45 pm -
1 stop19h 15m
Deal found 8/3![Multiple Airlines logo]()
$932
This Travelis deal was found by Cheapflights users on 8/3. 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 Travelis is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/2011:15 am -
2 stops17h 49m
dom. 9/277:15 pm -
2 stops27h 45m
Deal found 8/3![Air Canada logo]()
$989
This Travelis deal was found by Cheapflights users on 8/3. 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 Travelis is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/206:00 am -
2 stops22h 18m
dom. 9/272:10 pm -
1 stop17h 30m
Deal found 8/3![Lufthansa logo]()
$990
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 agosto 6, 2026.
Search for one-way flight options from Porto to Seattle. Find affordable one-way fares based on user searches. Data last updated agosto 6, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/2. 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. 10/86:40 am -
3 stops42h 30m
Deal found 8/2![Multiple Airlines logo]()
$499
This Kiwi.com deal was found by Cheapflights users on 8/5. 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. 9/2411:30 am -
3 stops36h 30m
Deal found 8/5![Multiple Airlines logo]()
$502
This Thrive Travel deal was found by Cheapflights users on 8/2. 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 Thrive Travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/146:30 am -
2 stops36h 04m
Deal found 8/2![Multiple Airlines logo]()
$619
This Thrive Travel deal was found by Cheapflights users on 8/1. 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 Thrive Travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/127:35 pm -
2 stops46h 59m
Deal found 8/1![Multiple Airlines logo]()
$707
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 agosto 6, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $886 (Mytrip) |
One-way from | $499 (Kiwi.com) |
Popular in | July |
Cheapest in | May |
Average price | $968 |
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 agosto 6, 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
mié. 10/21
10:45 am-5:20 pm
1 stop38h 35m
Seattle/Tacoma Intl
mié. 11/4
10:50 am-3:25 pm
2 stops44h 35m
$961
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
vie. 11/13
6:00 am-11:18 pm
3 stops25h 18m
Seattle/Tacoma Intl
lun. 11/16
8:09 am-9:30 am
2 stops17h 21m
$996
Quickest round-trip
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
jue. 9/17
6:00 am-6:41 pm
2 stops20h 41m
Seattle/Tacoma Intl
jue. 9/24
2:10 pm-3:45 pm
1 stop17h 35m
$1,002
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
lun. 8/24
12:10 pm-11:55 am
1 stop31h 45m
Seattle/Tacoma Intl
dom. 8/30
11:04 pm-9:45 am
2 stops26h 41m
$1,011
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
lun. 8/24
4:20 pm-11:37 am
1 stop27h 17m
Seattle/Tacoma Intl
dom. 8/30
6:40 pm-10:00 pm
1 stop19h 20m
$1,015
Cheapest one-way
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
lun. 9/14
6:30 am-10:34 am
2 stops36h 04m
$619
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
sáb. 9/12
7:35 pm-10:34 am
2 stops46h 59m
$707
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
sáb. 9/12
6:20 am-4:59 pm
1 stop18h 39m
$903
Quickest one-way
PortoSeattle
OPO Porto - SEA Seattle/Tacoma Intl
OPOSEA
Porto
dom. 11/8
12:35 pm-9:39 pm
1 stop17h 04m
$921
Sorted 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
Edmonds
Snoqualmie
Tumwater
Centralia
Marysville
Puyallup
Kent
Ellensburg
Fife
Ocean Shores
Lakewood
Lynnwood
Poulsbo
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