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$274+ 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 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
nov. 27 — déc. 41
jeu. 11/27
jeu. 12/4
1 adult, Economy
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Find 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 octobre 28, 2025.

This Orbitz deal was found by Cheapflights users on 10/28. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 11/268:10 amSEA - LIS
1 stop16h 45mMultiple Airlines
lun. 12/12:10 pmLIS - SEA
2 stops37h 06mMultiple Airlines
Deal found 10/28$505
This Finnair deal was found by Cheapflights users on 10/28. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 10/3112:03 pmSEA - LIS
1 stop13h 42mMultiple Airlines
ven. 11/711:05 amLIS - SEA
1 stop19h 15mMultiple Airlines
Deal found 10/28$506
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
mar. 11/252:00 pmSEA - OPO
1 stop24h 25mLufthansa
mar. 12/21:45 pmOPO - SEA
1 stop31h 35mLufthansa
Deal found 10/26$507
This United Airlines deal was found by Cheapflights users on 10/27. 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.
sam. 11/2212:10 amSEA - LIS
1 stop24h 00mUnited Airlines
mar. 12/910:15 amLIS - SEA
2 stops19h 31mUnited Airlines
Deal found 10/27$507
This United Airlines deal was found by Cheapflights users on 10/27. 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. 12/18:10 amSEA - LIS
1 stop17h 10mUnited Airlines
lun. 12/85:00 amLIS - SEA
1 stop15h 10mUnited Airlines
Deal found 10/27$508
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
mar. 11/252:00 pmSEA - OPO
1 stop16h 45mMultiple Airlines
mar. 12/212:05 pmOPO - SEA
2 stops43h 10mMultiple Airlines
Deal found 10/26$509
This Mytrip deal was found by Cheapflights users on 10/26. 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.
jeu. 11/2710:05 amSEA - OPO
2 stops17h 35mMultiple Airlines
ven. 12/126:30 amOPO - SEA
2 stops20h 46mMultiple Airlines
Deal found 10/26$510
This American Airlines deal was found by Cheapflights users on 10/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/289:09 amSEA - LIS
2 stops16h 56mAmerican Airlines
sam. 11/810:45 amLIS - SEA
1 stop19h 35mAmerican Airlines
Deal found 10/28$510
This Mytrip deal was found by Cheapflights users on 10/28. 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. 11/252:00 pmSEA - LIS
1 stop16h 30mLufthansa
mar. 12/22:10 pmLIS - SEA
1 stop31h 10mLufthansa
Deal found 10/28$515
This United Airlines deal was found by Cheapflights users on 10/28. 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.
mer. 11/58:36 amSEA - LIS
2 stops17h 39mUnited Airlines
mer. 11/1910:15 amLIS - SEA
2 stops18h 39mUnited Airlines
Deal found 10/28$519
This Air Canada deal was found by Cheapflights users on 10/26. 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.
mer. 11/268:10 amSEA - LIS
1 stop16h 45mAir Canada
sam. 12/611:20 amLIS - SEA
2 stops35h 11mAir Canada
Deal found 10/26$522
This KAYAK deal was found by Cheapflights users on 10/25. 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.
dim. 11/93:10 pmSEA - LIS
2 stops23h 40mLufthansa
jeu. 11/205:00 amLIS - SEA
1 stop15h 10mLufthansa
Deal found 10/25$524

Cheap flight deals from Seattle to Portugal

Keep the following information in mind while searching for Seattle to Portugal flight deals. Data was last updated octobre 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$505
(Orbitz)

One-way from

$274
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$818
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. 19% potential increase in price ($216 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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 octobre 28, 2025.
Use the filters below to find and compare flights from Seattle to Portugal that are best for you.

Fly from

Seattle

Fly to

Portugal

Route

Depart

Return

Price

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

lun. 2/23

12:37 pm-9:20 am

3 stops36h 43m

Lisbon Humberto Delgado

mer. 3/4

3:55 pm-3:01 pm

2 stops31h 06m

$512

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

jeu. 11/27

6:20 am-9:30 am

1 stop19h 10m

Porto

ven. 12/12

6:30 am-1:20 pm

1 stop14h 50m

$521

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

sam. 2/21

8:17 am-10:15 am

1 stop17h 58m

Lisbon Humberto Delgado

sam. 2/28

5:00 am-12:10 pm

1 stop15h 10m

$522

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

mar. 2/17

7:20 am-4:05 pm

2 stops24h 45m

Lisbon Humberto Delgado

ven. 2/20

6:55 am-10:25 pm

2 stops23h 30m

$526

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

lun. 11/24

3:00 pm-6:55 pm

1 stop19h 55m

Faro

dim. 12/7

6:50 pm-11:50 am

1 stop25h 00m

$531

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

dim. 3/22

11:38 pm-9:05 am

1 stop26h 27m

Lisbon Humberto Delgado

dim. 3/29

11:05 am-9:53 pm

1 stop18h 48m

$540

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

jeu. 1/15

3:10 pm-2:35 pm

1 stop15h 25m

Lisbon Humberto Delgado

dim. 1/18

5:00 am-11:50 am

1 stop14h 50m

$541

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 11/25

3:37 pm-11:15 am

2 stops35h 38m

Porto

mar. 12/2

1:45 pm-1:20 pm

1 stop31h 35m

$543

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

sam. 3/14

12:00 pm-9:30 pm

2 stops26h 30m

Lisbon Humberto Delgado

sam. 3/21

7:05 am-10:16 pm

2 stops22h 11m

$544

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

sam. 3/14

12:00 pm-9:30 pm

2 stops26h 30m

Lisbon Humberto Delgado

sam. 3/21

7:05 am-10:16 pm

2 stops22h 11m

$544

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 48 results
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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 $351). Flying from Seattle to Portugal in June is currently the most expensive (average of $1,000). 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.

What is the cheapest time of day to fly from SEA to PT?

Find hourly flight availability from Seattle to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated octobre 28, 2025.

It’s typically best to fly out from Seattle to Portugal in the afternoon. Doing so could potentially save you 22% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Seattle to Portugal?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Portugal. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Seattle to Portugal flight should consider departing on Tuesday mornings when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 octobre 28, 2025.
Get a feel of what it's like to fly with Delta, Air France, and United Airlines 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
7,993 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
7.9
Good
7,993 reviews
Delta
7.9
Good
7,993 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Air France
7.4
Good
1,481 reviews
Delta
7.9
Good
7,993 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
United Airlines
7.4
Good
8,996 reviews
Delta
7.9
Good
7,993 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Lufthansa
6.8
Okay
7,532 reviews
Delta
7.9
Good
7,993 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
British Airways
6.7
Okay
7,481 reviews
Delta
7.9
Good
7,993 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

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 $522, United Airlines can have you in Portugal from Seattle in 17h 58m. 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 Scandinavian Airlines. According to our data, you can fly for as low as $308. Users have also found prices from $433 and $464 on Aer Lingus and British Airways, 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 - Funchal Madeira 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 $351). Flying from Seattle to Portugal in June is currently the most expensive (average of $1,000). 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

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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 octobre 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$357Average$603FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$517Average$1,018FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$543Average$1,024FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$544Average$1,285FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$551Average$1,000FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$560Average$965FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$627Average$1,040FlexibilityNo cancel feeOn-time71%
Aer LingusCheapest$627Average$966FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$632Average$1,007FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$646Average$789FlexibilityNo cancel feeOn-time77%

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