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$244+ Cheap flights from Seattle (SEA) to Portugal

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 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
เม.ย. 16 — เม.ย. 231
พฤ. 4/16
พฤ. 4/23
1 adult, Economy
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Cheap flight deals from Seattle to Portugal

Cheapest flights from Seattle to Portugal
Explore the most affordable flight options available from Seattle to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on มีนาคม 17, 2026.

This FlightHub deal was found by Cheapflights users on 3/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
พ. 8/1912:00 pm
SEA
-
LIS
2 stops24h 40m
Scandinavian Airlines
ส. 10/104:25 pm
LIS
-
SEA
1 stop29h 20m
Scandinavian Airlines
Deal found 3/16$554
This FlightHub deal was found by Cheapflights users on 3/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ศ. 10/23:55 pm
SEA
-
LIS
1 stop33h 05m
Scandinavian Airlines
ส. 10/104:25 pm
LIS
-
SEA
1 stop29h 20m
Scandinavian Airlines
Deal found 3/17$555
This Kiwi.com deal was found by Cheapflights users on 3/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
พ. 4/86:50 pm
SEA
-
LIS
1 stop19h 55m
Lufthansa
พ. 4/226:15 am
LIS
-
SEA
2 stops24h 27m
Lufthansa
Deal found 3/14$560
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
จ. 4/132:10 pm
SEA
-
LIS
1 stop25h 20m
Lufthansa
จ. 4/206:15 am
LIS
-
SEA
2 stops24h 27m
Lufthansa
Deal found 3/16$561
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
พ. 4/156:50 pm
SEA
-
LIS
1 stop19h 55m
Lufthansa
ส. 4/255:05 am
LIS
-
SEA
1 stop15h 15m
Lufthansa
Deal found 3/16$562
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
อา. 4/126:50 pm
SEA
-
LIS
1 stop19h 55m
Lufthansa
ส. 4/255:05 am
LIS
-
SEA
1 stop15h 15m
Lufthansa
Deal found 3/13$565
This oojo deal was found by Cheapflights users on 3/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ส. 9/53:55 pm
SEA
-
LIS
1 stop33h 05m
Scandinavian Airlines
ส. 9/124:25 pm
LIS
-
SEA
1 stop29h 20m
Scandinavian Airlines
Deal found 3/15$566
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
อ. 4/72:10 pm
SEA
-
LIS
1 stop24h 00m
Lufthansa
พ. 4/226:15 am
LIS
-
SEA
2 stops24h 27m
Lufthansa
Deal found 3/13$572
This Air Canada deal was found by Cheapflights users on 3/13. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
อ. 4/78:00 am
SEA
-
FAO
2 stops23h 05m
Air Canada
พ. 4/223:55 pm
FAO
-
SEA
2 stops55h 10m
Air Canada
Deal found 3/13$625
This KAYAK deal was found by Cheapflights users on 3/13. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
อา. 4/122:10 pm
SEA
-
FAO
1 stop16h 20m
Lufthansa
อ. 4/213:55 pm
FAO
-
SEA
1 stop33h 04m
Lufthansa
Deal found 3/13$629
This KAYAK deal was found by Cheapflights users on 3/13. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
อ. 4/72:10 pm
SEA
-
FAO
1 stop16h 20m
Lufthansa
พ. 4/223:55 pm
FAO
-
SEA
2 stops38h 47m
Lufthansa
Deal found 3/13$639
This United Airlines deal was found by Cheapflights users on 3/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
อ. 4/218:00 am
SEA
-
FAO
2 stops19h 20m
United Airlines
จ. 4/273:25 pm
FAO
-
SEA
2 stops40h 02m
United Airlines
Deal found 3/14$643

Find flight deals from Seattle to Portugal

Keep the following information in mind while searching for Seattle to Portugal flight deals. Data was last updated มีนาคม 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$554
(FlightHub)

One-way from

$244
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$666
Provider with most accurate pricing for Seattle/Tacoma Intl-Lisbon Humberto Delgado flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Lisbon Humberto Delgado flights.
Search Deals
From Seattle/Tacoma Intl to Portugal
Search Deals
One-way flight from Seattle/Tacoma Intl to Portugal
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($266 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Portugal 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 มีนาคม 17, 2026.
Use the filters below to find and compare flights from Seattle to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

ศ. 4/17

6:50 pm-10:45 pm

1 stop19h 55m

Lisbon Humberto Delgado

อ. 4/21

5:05 am-12:20 pm

1 stop15h 15m

$608

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

อ. 4/28

10:48 am-10:45 pm

2 stops27h 57m

Lisbon Humberto Delgado

อ. 5/5

11:25 am-2:36 pm

2 stops35h 11m

$615

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

อ. 4/7

9:25 am-2:35 pm

2 stops21h 10m

Lisbon Humberto Delgado

อ. 4/21

5:00 am-4:48 pm

2 stops19h 48m

$634

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

อ. 4/21

8:00 am-11:20 am

2 stops19h 20m

Faro

จ. 4/27

3:25 pm-11:27 pm

2 stops40h 02m

$643

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

พฤ. 4/23

5:35 pm-6:45 pm

1 stop17h 10m

Lisbon Humberto Delgado

จ. 4/27

7:45 pm-11:45 am

1 stop24h 00m

$648

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

พ. 4/8

2:10 pm-2:30 pm

1 stop16h 20m

Faro

จ. 4/20

3:25 pm-11:27 pm

3 stops40h 02m

$657

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

พฤ. 4/23

7:15 am-10:55 am

2 stops19h 40m

Lisbon Humberto Delgado

พฤ. 4/30

5:00 am-5:16 pm

2 stops20h 16m

$682

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

อ. 5/5

7:15 am-11:15 am

2 stops20h 00m

Lisbon Humberto Delgado

อ. 5/19

5:00 am-4:01 pm

2 stops19h 01m

$704

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

อ. 4/7

2:10 pm-2:30 pm

1 stop16h 20m

Faro

อา. 4/19

3:25 pm-7:45 pm

2 stops36h 20m

$707

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

พ. 4/8

2:10 pm-2:30 pm

1 stop16h 20m

Faro

พ. 4/22

3:25 pm-12:20 pm

1 stop28h 55m

$725

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/12

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Seattle to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal from Seattle 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 Seattle to Portugal

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

Currently, January is the cheapest month in which you can book a flight from Seattle to Portugal (average of $347). Flying from Seattle to Portugal in June is currently the most expensive (average of $749). 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.

Reviews of airlines servicing Portugal

Get insights into the airlines that provide service to Portugal. 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 Portugal. Reviews last updated มีนาคม 17, 2026.
Get a feel of what it's like to fly with Delta,United Airlines, andIcelandair from Seattle to Portugal by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,288 reviews

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,288 reviews
Delta
7.9
Good
8,288 reviews

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,434 reviews
Delta
7.9
Good
8,288 reviews

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Icelandair
7.1
Good
622 reviews
Delta
7.9
Good
8,288 reviews

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Lufthansa
6.8
Okay
7,858 reviews
Delta
7.9
Good
8,288 reviews

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
British Airways
6.7
Okay
7,800 reviews
Delta
7.9
Good
8,288 reviews

Overall

7.9

Comfort

7.9

Crew

8.5

Entertainment

7.8

Boarding

8.1

Food

7.2

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Portugal. 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 from for flights from Seattle to Portugal?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Portugal. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

  • How long is the flight from Seattle to Portugal?

    For as low as $648, United Airlines can have you in Portugal from Seattle in 17h 10m. The distance between Seattle and Portugal is about 5199 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $257. Users have also found prices from $272 and $284 on Scandinavian Airlines and Icelandair, respectively.

  • What are the most popular routes from Seattle to Portugal?

    When deciding which route to take from Seattle to Portugal consider Seattle/Tacoma Intl - Lisbon Humberto Delgado, Seattle/Tacoma Intl - Porto or Seattle/Tacoma Intl - Faro as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle to Portugal 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 Seattle to Portugal?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Portugal (average of $347). Flying from Seattle to Portugal in June is currently the most expensive (average of $749). 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

Browse thousands of different options on Cheapflights for your next trip

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Top 10 airlines flying from Seattle to Portugal

Discover the top 10 airlines that operate flights from Seattle to Portugal. 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 มีนาคม 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$348Average$493FlexibilityNo cancel feeOn-time76%
KLMCheapest$481Average$865FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$482Average$835FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$484Average$1,016FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$494Average$1,185FlexibilityNo cancel feeOn-time69%
Air FranceCheapest$530Average$947FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$543Average$917FlexibilityNo cancel feeOn-time67%
DeltaCheapest$545Average$913FlexibilityNo cancel feeOn-timeN/A
Aer LingusCheapest$553Average$957FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$558Average$1,028FlexibilityNo cancel feeOn-time71%

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