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Portugal

$270+ 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 1/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
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 December 12, 2025.

This United Airlines deal was found by Cheapflights users on 12/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:00 amSEA - LIS
1 stop18h 15mUnited Airlines
Wed 1/1411:20 amLIS - SEA
2 stops36h 41mUnited Airlines
Deal found 12/11$498
This Air Canada deal was found by Cheapflights users on 12/11. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:00 pmSEA - LIS
2 stops28h 55mAir Canada
Wed 1/145:00 amLIS - SEA
2 stops25h 16mAir Canada
Deal found 12/11$501
This United Airlines deal was found by Cheapflights users on 12/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3011:59 pmSEA - LIS
2 stops26h 16mUnited Airlines
Wed 1/1411:20 amLIS - SEA
2 stops36h 41mUnited Airlines
Deal found 12/11$503
This KAYAK deal was found by Cheapflights users on 12/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/303:40 pmSEA - LIS
2 stops33h 15mLufthansa
Tue 1/132:10 pmLIS - SEA
1 stop31h 10mLufthansa
Deal found 12/11$507
This KAYAK deal was found by Cheapflights users on 12/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:10 pmSEA - LIS
1 stop16h 05mLufthansa
Tue 1/137:00 pmLIS - SEA
1 stop26h 20mLufthansa
Deal found 12/11$508
This Air Canada deal was found by Cheapflights users on 12/11. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/293:40 pmSEA - LIS
2 stops57h 15mAir Canada
Wed 1/1411:20 amLIS - SEA
2 stops18h 46mAir Canada
Deal found 12/11$513
This United Airlines deal was found by Cheapflights users on 12/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:00 amSEA - LIS
1 stop18h 15mUnited Airlines
Tue 1/1310:15 amLIS - SEA
2 stops19h 00mUnited Airlines
Deal found 12/11$519
This KAYAK deal was found by Cheapflights users on 12/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/303:40 pmSEA - LIS
2 stops33h 15mLufthansa
Mon 1/125:00 amLIS - SEA
2 stops45h 14mLufthansa
Deal found 12/11$525
This KAYAK deal was found by Cheapflights users on 12/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:10 pmSEA - LIS
1 stop24h 20mLufthansa
Mon 1/125:00 amLIS - SEA
2 stops45h 14mLufthansa
Deal found 12/11$526
This Air France deal was found by Cheapflights users on 12/11. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:05 pmSEA - LIS
1 stop17h 05mMultiple Airlines
Mon 1/1211:25 amLIS - SEA
1 stop32h 25mMultiple Airlines
Deal found 12/11$560
This KLM deal was found by Cheapflights users on 12/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/104:48 pmSEA - FNC
2 stops40h 22mKLM
Wed 12/2410:25 amFNC - SEA
1 stop33h 25mKLM
Deal found 12/10$1,167
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 12/129:00 amSEA - PDL
1 stop14h 20mMultiple Airlines
Fri 12/194:50 pmPDL - SEA
2 stops21h 30mMultiple Airlines
Deal found 12/11$1,269

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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$436
(Kiwi.com)

One-way from

$270
(Cheapflightsfares)

Popular in

June

Cheapest in

January

Average price

$1,107
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. 22% potential increase in price ($250 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 December 12, 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

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fri 1/30

3:10 pm-12:50 pm

1 stop13h 40m

Porto

Sun 2/15

4:15 pm-10:43 pm

2 stops38h 28m

$444

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 1/12

2:10 pm-10:30 am

1 stop36h 20m

Porto

Tue 1/20

5:00 am-11:50 am

1 stop14h 50m

$479

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Sat 1/24

8:10 am-2:15 pm

2 stops22h 05m

Faro

Sat 1/31

1:25 pm-7:16 pm

2 stops37h 51m

$487

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 3/3

6:00 am-8:00 am

2 stops18h 00m

Lisbon Humberto Delgado

Sun 3/8

5:30 am-1:05 pm

1 stop15h 35m

$487

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Sat 1/24

7:00 am-2:15 pm

2 stops23h 15m

Faro

Sat 1/31

1:25 pm-7:16 pm

2 stops37h 51m

$487

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sat 2/28

9:55 pm-8:55 am

1 stop27h 00m

Lisbon Humberto Delgado

Tue 3/10

11:25 am-12:35 pm

1 stop32h 10m

$487

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 3/2

7:10 am-9:00 am

1 stop17h 50m

Lisbon Humberto Delgado

Sun 3/8

5:30 am-1:05 pm

1 stop15h 35m

$487

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sat 2/28

11:59 pm-10:15 am

2 stops26h 16m

Lisbon Humberto Delgado

Thu 3/12

5:00 am-1:10 pm

1 stop15h 10m

$488

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 1/25

2:10 pm-10:30 am

1 stop36h 20m

Porto

Sun 2/1

5:00 am-5:49 pm

2 stops20h 49m

$489

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sat 2/28

11:59 pm-10:15 am

2 stops26h 16m

Lisbon Humberto Delgado

Wed 3/11

6:10 am-2:20 pm

1 stop15h 10m

$490

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 57 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 $348). 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 December 12, 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 at noon 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 December 12, 2025.
Get a feel of what it's like to fly with Delta, United Airlines, and Icelandair 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
8,007 reviews

Comfort

7.9

Crew

8.5

Overall

7.9

Entertainment

7.9

Food

7.3

Boarding

8.1

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
8,007 reviews
Delta
7.9
Good
8,007 reviews

Comfort

7.9

Crew

8.5

Overall

7.9

Entertainment

7.9

Food

7.3

Boarding

8.1

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
9,093 reviews
Delta
7.9
Good
8,007 reviews

Comfort

7.9

Crew

8.5

Overall

7.9

Entertainment

7.9

Food

7.3

Boarding

8.1

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
7.0
Good
589 reviews
Delta
7.9
Good
8,007 reviews

Comfort

7.9

Crew

8.5

Overall

7.9

Entertainment

7.9

Food

7.3

Boarding

8.1

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
7,626 reviews
Delta
7.9
Good
8,007 reviews

Comfort

7.9

Crew

8.5

Overall

7.9

Entertainment

7.9

Food

7.3

Boarding

8.1

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
7,571 reviews
Delta
7.9
Good
8,007 reviews

Comfort

7.9

Crew

8.5

Overall

7.9

Entertainment

7.9

Food

7.3

Boarding

8.1

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 $444, Lufthansa can have you in Portugal from Seattle in 13h 40m. The distance between Seattle and Portugal is about 5083 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 Icelandair. According to our data, you can fly for as low as $322. Users have also found prices from $360 and $379 on TAP AIR PORTUGAL and Air France, 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 $348). 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.

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See prices for flight routes from nearby airports that may be better suited for you.
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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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$356Average$577FlexibilityNo cancel feeOn-time76%
KLMCheapest$481Average$992FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$514Average$1,265FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$516Average$1,005FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$525Average$932FlexibilityNo cancel feeOn-time70%
Air CanadaCheapest$543Average$1,013FlexibilityNo cancel feeOn-time67%
Air FranceCheapest$553Average$944FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$558Average$1,030FlexibilityNo cancel feeOn-time71%
SWISSCheapest$562Average$940FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$576Average$821FlexibilityNo cancel feeOn-time77%

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