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$419+ Cheap flights from Portugal 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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — SEA
Aug 19 — Aug 261
Wed 8/19
Wed 8/26
1 adult, Economy
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Cheap flight deals from Portugal to Seattle

Cheapest flights from Portugal to Seattle
Explore the most affordable flight options available from Portugal to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 20, 2026.

This Ticket deal was found by Cheapflights users on 7/17. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2910:55 pm
LIS
-
SEA
1 stop22h 50m
Scandinavian Airlines
Fri 9/113:55 pm
SEA
-
LIS
1 stop22h 10m
Scandinavian Airlines
Deal found 7/17$809
This Rumbo deal was found by Cheapflights users on 7/19. 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.
Sat 9/510:55 pm
LIS
-
SEA
1 stop22h 50m
Scandinavian Airlines
Fri 9/183:55 pm
SEA
-
LIS
1 stop22h 10m
Scandinavian Airlines
Deal found 7/19$823
This Mytrip deal was found by Cheapflights users on 7/19. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/58:10 pm
OPO
-
SEA
3 stops32h 30m
Multiple Airlines
Mon 10/123:40 pm
SEA
-
OPO
3 stops24h 00m
Multiple Airlines
Deal found 7/19$824
This Rumbo deal was found by Cheapflights users on 7/15. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2712:20 pm
OPO
-
SEA
1 stop33h 25m
Scandinavian Airlines
Sat 9/53:55 pm
SEA
-
OPO
1 stop17h 10m
Scandinavian Airlines
Deal found 7/15$876
This Mytrip deal was found by Cheapflights users on 7/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:15 am
LIS
-
SEA
2 stops35h 25m
Multiple Airlines
Tue 9/83:40 pm
SEA
-
LIS
2 stops21h 05m
Multiple Airlines
Deal found 7/17$885
This Mytrip deal was found by Cheapflights users on 7/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:15 am
LIS
-
SEA
2 stops35h 25m
WestJet
Sun 8/307:00 am
SEA
-
LIS
3 stops30h 45m
WestJet
Deal found 7/17$893
This Mytrip deal was found by Cheapflights users on 7/18. 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.
Sat 9/56:10 am
LIS
-
SEA
2 stops35h 30m
Multiple Airlines
Fri 9/183:40 pm
SEA
-
LIS
2 stops23h 45m
Multiple Airlines
Deal found 7/18$922
This Mytrip deal was found by Cheapflights users on 7/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/279:30 pm
OPO
-
SEA
3 stops44h 10m
Multiple Airlines
Mon 8/317:00 pm
SEA
-
OPO
3 stops20h 40m
Multiple Airlines
Deal found 7/17$935
This Delta deal was found by Cheapflights users on 7/16. 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 8/275:00 am
OPO
-
SEA
1 stop14h 37m
Delta
Fri 9/41:30 pm
SEA
-
OPO
1 stop17h 55m
Delta
Deal found 7/16$944
This Delta deal was found by Cheapflights users on 7/17. 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.
Mon 8/315:00 am
OPO
-
SEA
1 stop14h 37m
Delta
Mon 9/76:45 pm
SEA
-
OPO
1 stop19h 45m
Delta
Deal found 7/17$945
This Delta deal was found by Cheapflights users on 7/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/275:00 am
OPO
-
SEA
2 stops19h 54m
Delta
Sat 9/56:45 pm
SEA
-
OPO
1 stop19h 15m
Delta
Deal found 7/15$948
This Delta deal was found by Cheapflights users on 7/17. 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 8/275:00 am
OPO
-
SEA
1 stop14h 37m
Delta
Mon 8/317:15 am
SEA
-
OPO
2 stops19h 25m
Delta
Deal found 7/17$949

Find flight deals from Portugal to Seattle

Keep the following information in mind while searching for Portugal to Seattle flight deals. Data was last updated July 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$809
(Ticket)

One-way from

$419
(Mytrip)

Popular in

July

Cheapest in

December

Average price

$1,382
Provider with most accurate pricing for Lisbon Humberto Delgado-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lisbon Humberto Delgado-Seattle/Tacoma Intl flights.
Search Deals
From Portugal to Seattle/Tacoma Intl
Search Deals
One-way flight from Portugal to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($105 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portugal 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 July 20, 2026.
Use the filters below to find and compare flights from Portugal to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 8/27

5:00 am-11:37 am

1 stop14h 37m

Seattle/Tacoma Intl

Mon 8/31

6:40 pm-10:30 pm

1 stop19h 50m

$944

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 10/5

5:00 am-4:35 pm

1 stop19h 35m

Seattle/Tacoma Intl

Mon 10/12

6:45 pm-10:00 pm

1 stop19h 15m

$944

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 8/31

5:00 am-11:37 am

1 stop14h 37m

Seattle/Tacoma Intl

Mon 9/7

6:45 pm-10:30 pm

1 stop19h 45m

$944

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 8/27

5:00 am-4:54 pm

2 stops19h 54m

Seattle/Tacoma Intl

Sat 9/5

6:45 pm-10:00 pm

1 stop19h 15m

$948

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 10/5

5:00 am-4:45 pm

2 stops19h 45m

Seattle/Tacoma Intl

Mon 10/12

9:43 am-3:25 pm

2 stops21h 42m

$949
Quickest round-trip

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Mon 8/31

5:00 am-11:37 am

1 stop14h 37m

Seattle/Tacoma Intl

Mon 9/7

6:45 pm-5:50 pm

1 stop15h 05m

$951

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Sat 8/29

5:00 am-4:27 pm

1 stop19h 27m

Seattle/Tacoma Intl

Fri 9/11

11:50 am-2:55 pm

2 stops19h 05m

$951

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Mon 1/11

5:00 am-11:50 am

1 stop14h 50m

Seattle/Tacoma Intl

Mon 1/25

2:15 pm-3:10 pm

1 stop16h 55m

$952

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Tue 9/1

5:00 am-11:47 am

1 stop14h 47m

Seattle/Tacoma Intl

Tue 9/8

6:45 pm-5:50 pm

1 stop15h 05m

$952

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Sat 9/5

5:00 am-11:47 am

1 stop14h 47m

Seattle/Tacoma Intl

Fri 9/18

7:15 am-11:15 am

2 stops20h 00m

$952

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/19

Showing 1-10 of 34 resultsSorted by cheapest first
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Best time to book a flight from Portugal to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Portugal with our price prediction graph.
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 Portugal to Seattle

What is the cheapest month to book a flight from Portugal to Seattle?

Currently, February is the cheapest month in which you can book a flight from Portugal to Seattle (average of $897). Flying from Portugal to Seattle in July is currently the most expensive (average of $1,463). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How often are flights from Portugal to Seattle delayed?

About 50% of weekly flights between Portugal and Seattle have experienced delays in the past year, with the average delay time being 108 minutes.

What is the most punctual flight time for Portugal to Seattle flights?

Historically, flights departing at night are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Tuesday tends to have the lowest number of delays on this route, whereas Tuesday has historically faced a higher average of delays compared to other days of the week.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated July 20, 2026.
Read reviews from past customers who have flown Delta from Portugal to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,478 reviews

Comfort

7.8

Boarding

8.1

Overall

7.8

Food

7.2

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Delta
7.8
Good
8,478 reviews
Delta
7.8
Good
8,478 reviews

Comfort

7.8

Boarding

8.1

Overall

7.8

Food

7.2

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,

Related info for your journey

Find useful and relevant information for your journey from Portugal to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Seattle from Portugal?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl (SEA) is the airport most travelers will use when flying to Seattle from Portugal.

  • How long is the flight from Portugal to Seattle?

    Departing from Portugal to Seattle will take you 14h 37m. There are 5083 mi between Portugal and Seattle.

  • What are the cheapest airlines to fly from Portugal to Seattle one-way?

    $546 is the cheapest one-way deal found within the past few days, from British Airways. You may also be able to find cheap deals on Aer Lingus and American Airlines, with prices starting from $570 and $588, respectively.

  • Can I find deals for flights from Portugal to Seattle that include hotel bookings?

    Yes. In addition to deals on Portugal to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portugal to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portugal to Seattle.

  • Can I find deals for business class flights from Portugal to Seattle?

    Yes. Cheapflights offers flight deals from Portugal to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Portugal to Seattle?

    Currently, February is the cheapest month in which you can book a flight from Portugal to Seattle (average of $897). Flying from Portugal to Seattle in July is currently the most expensive (average of $1,463). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
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Tukwila
Centralia
Puyallup
Kent
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Ocean Shores
Lakewood
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Issaquah

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Portugal to Seattle

Discover the top airline that operate flights from Portugal to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$1,041Average$1,185FlexibilityNo cancel feeOn-timeN/A

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