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Portugal

$266+ 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 4/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
feb. 26 — mar. 51
jue. 2/26
jue. 3/5
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 enero 27, 2026.

This Gotogate deal was found by Cheapflights users on 1/25. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 2/228:00 am
SEA
-
OPO
2 stops26h 30m
Multiple Airlines
dom. 3/16:15 am
OPO
-
SEA
1 stop15h 05m
Multiple Airlines
Deal found 1/25$461
This Mytrip deal was found by Cheapflights users on 1/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/248:00 am
SEA
-
OPO
2 stops26h 30m
Multiple Airlines
mar. 3/31:45 pm
OPO
-
SEA
1 stop31h 35m
Multiple Airlines
Deal found 1/27$478
This KLM deal was found by Cheapflights users on 1/25. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/241:40 pm
SEA
-
OPO
1 stop12h 50m
KLM
mar. 3/311:15 am
OPO
-
SEA
1 stop32h 20m
KLM
Deal found 1/25$479
This Delta deal was found by Cheapflights users on 1/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/131:45 pm
SEA
-
OPO
2 stops24h 45m
Delta
jue. 4/235:00 am
OPO
-
SEA
1 stop19h 30m
Delta
Deal found 1/26$482
This KLM deal was found by Cheapflights users on 1/26. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 3/53:05 pm
SEA
-
FAO
1 stop20h 15m
KLM
mar. 3/107:45 pm
FAO
-
SEA
1 stop23h 50m
KLM
Deal found 1/26$483
This KLM deal was found by Cheapflights users on 1/25. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 3/37:30 am
SEA
-
OPO
2 stops19h 00m
Multiple Airlines
mar. 3/109:55 am
OPO
-
SEA
1 stop33h 40m
Multiple Airlines
Deal found 1/25$483
This FlightHub deal was found by Cheapflights users on 1/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 3/43:10 pm
SEA
-
OPO
1 stop24h 30m
Lufthansa
jue. 3/126:00 am
OPO
-
SEA
2 stops20h 03m
Lufthansa
Deal found 1/27$484
This FlightHub deal was found by Cheapflights users on 1/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/203:40 pm
SEA
-
LIS
2 stops33h 40m
Multiple Airlines
mar. 4/285:05 am
LIS
-
SEA
1 stop15h 15m
Multiple Airlines
Deal found 1/26$484
This Delta deal was found by Cheapflights users on 1/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/146:40 pm
SEA
-
LIS
1 stop15h 10m
Delta
mié. 4/2211:55 am
LIS
-
SEA
1 stop31h 50m
Delta
Deal found 1/26$486
This United Airlines deal was found by Cheapflights users on 1/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/249:00 am
SEA
-
OPO
2 stops16h 30m
United Airlines
mar. 3/312:30 pm
OPO
-
SEA
2 stops20h 29m
United Airlines
Deal found 1/26$487
This KLM deal was found by Cheapflights users on 1/26. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 4/197:23 am
SEA
-
LIS
1 stop16h 37m
KLM
mié. 4/297:45 pm
LIS
-
SEA
1 stop24h 00m
KLM
Deal found 1/26$487
This KLM deal was found by Cheapflights users on 1/25. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 3/117:20 am
SEA
-
FAO
2 stops19h 15m
KLM
mié. 3/186:55 pm
FAO
-
SEA
1 stop24h 40m
KLM
Deal found 1/25$488

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 enero 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$461
(Gotogate)

One-way from

$266
(Cheapflightsfares)

Popular in

June

Cheapest in

January

Average price

$504
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 ($274 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 enero 27, 2026.
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

dom. 2/22

8:00 am-6:30 pm

2 stops26h 30m

Porto

dom. 3/1

6:15 am-1:20 pm

1 stop15h 05m

$466

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

1:40 pm-10:30 am

1 stop12h 50m

Porto

mar. 3/3

5:00 am-11:35 am

1 stop14h 35m

$479

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

jue. 3/5

3:05 pm-7:20 pm

1 stop20h 15m

Faro

mar. 3/10

7:45 pm-12:35 pm

1 stop23h 50m

$483

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

mié. 3/11

4:05 pm-8:25 am

1 stop33h 20m

Faro

mié. 3/18

10:20 am-12:35 pm

1 stop33h 15m

$483

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 3/3

3:05 pm-10:30 am

1 stop35h 25m

Porto

mar. 3/10

9:55 am-12:35 pm

1 stop33h 40m

$485

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

9:00 am-9:30 am

2 stops16h 30m

Porto

mar. 3/3

12:30 pm-12:59 am

2 stops20h 29m

$487

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

mar. 4/21

7:00 am-8:20 am

2 stops17h 20m

Lisbon Humberto Delgado

mié. 5/6

5:05 am-10:20 pm

2 stops25h 15m

$490

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

dom. 4/19

7:00 am-10:30 am

2 stops19h 30m

Lisbon Humberto Delgado

mié. 4/29

5:05 am-12:20 pm

1 stop15h 15m

$490

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

mié. 3/11

4:10 pm-1:20 pm

1 stop14h 10m

Lisbon Humberto Delgado

mié. 3/18

6:10 am-2:20 pm

1 stop15h 10m

$490

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

lun. 4/13

5:30 pm-10:15 pm

1 stop20h 45m

Porto

jue. 5/7

5:55 am-11:15 am

1 stop13h 20m

$490

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 60 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 $869). 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 enero 27, 2026.
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
8,119 reviews

Crew

8.5

Comfort

7.9

Food

7.2

Overall

7.9

Boarding

8.1

Entertainment

7.8

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
8,119 reviews
Delta
7.9
Good
8,119 reviews

Crew

8.5

Comfort

7.9

Food

7.2

Overall

7.9

Boarding

8.1

Entertainment

7.8

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
9,206 reviews
Delta
7.9
Good
8,119 reviews

Crew

8.5

Comfort

7.9

Food

7.2

Overall

7.9

Boarding

8.1

Entertainment

7.8

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
603 reviews
Delta
7.9
Good
8,119 reviews

Crew

8.5

Comfort

7.9

Food

7.2

Overall

7.9

Boarding

8.1

Entertainment

7.8

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
7,749 reviews
Delta
7.9
Good
8,119 reviews

Crew

8.5

Comfort

7.9

Food

7.2

Overall

7.9

Boarding

8.1

Entertainment

7.8

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
7,702 reviews
Delta
7.9
Good
8,119 reviews

Crew

8.5

Comfort

7.9

Food

7.2

Overall

7.9

Boarding

8.1

Entertainment

7.8

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 $479, KLM can have you in Portugal from Seattle in 12h 50m. 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 $286. Users have also found prices from $317 and $360 on British Airways and TAP AIR PORTUGAL, 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 $348). Flying from Seattle to Portugal in June is currently the most expensive (average of $869). 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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Alternative routes for Seattle to Portugal

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 enero 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$348Average$530FlexibilityNo cancel feeOn-time76%
KLMCheapest$481Average$901FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$486Average$852FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$488Average$1,033FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$498Average$1,205FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$543Average$1,056FlexibilityNo cancel feeOn-time67%
Air FranceCheapest$546Average$950FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$558Average$1,126FlexibilityNo cancel feeOn-time71%
DeltaCheapest$561Average$918FlexibilityNo cancel feeOn-timeN/A
SWISSCheapest$562Average$1,002FlexibilityNo cancel feeOn-time79%

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