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$305+ 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 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
ago. 3 — ago. 101
dom. 8/3
dom. 8/10
1 adult, Economy
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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 julio 29, 2025.

Round-trip from

$576
(Delta)

One-way from

$305
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$1,036
From Seattle/Tacoma Intl to Portugal
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One-way flight from Seattle/Tacoma Intl to Portugal
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Highest demand for flights based on searches. 16% potential increase in price ($188 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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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 julio 29, 2025.

This Delta deal was found by Cheapflights users on 7/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/1411:29 amSEA - LIS
2 stops19h 21mDelta
jue. 12/1110:00 amLIS - SEA
1 stop20h 16mDelta
Deal found 7/27$576
This United Airlines deal was found by Cheapflights users on 7/28. 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.
dom. 11/25:00 amSEA - OPO
1 stop19h 30mUnited Airlines
mar. 11/1812:35 pmOPO - SEA
1 stop18h 06mUnited Airlines
Deal found 7/28$583
This CheapOair deal was found by Cheapflights users on 7/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/2810:05 amSEA - LIS
2 stops16h 15mMultiple Airlines
sáb. 11/85:00 amLIS - SEA
1 stop15h 10mMultiple Airlines
Deal found 7/27$589
This Expedia deal was found by Cheapflights users on 7/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/82:00 pmSEA - LIS
2 stops25h 30mLufthansa
sáb. 11/152:10 pmLIS - SEA
1 stop31h 10mLufthansa
Deal found 7/27$594
This FlightHub deal was found by Cheapflights users on 7/27. 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.
sáb. 11/152:35 pmSEA - LIS
1 stop21h 45mIcelandair
dom. 11/309:20 pmLIS - SEA
1 stop27h 40mIcelandair
Deal found 7/27$597
This Booking.com deal was found by Cheapflights users on 7/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/87:35 pmSEA - LIS
1 stop18h 00mAer Lingus
mar. 9/1610:15 pmLIS - SEA
1 stop27h 35mAer Lingus
Deal found 7/27$606
This Air Canada deal was found by Cheapflights users on 7/29. 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.
vie. 10/175:30 amSEA - LIS
2 stops21h 35mAir Canada
dom. 11/95:00 amLIS - SEA
2 stops22h 16mAir Canada
Deal found 7/29$610
This FlightHub deal was found by Cheapflights users on 7/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/263:10 pmSEA - OPO
1 stop14h 00mMultiple Airlines
mié. 1/2112:10 pmOPO - SEA
2 stops40h 49mMultiple Airlines
Deal found 7/28$614
This FlightHub deal was found by Cheapflights users on 7/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/263:10 pmSEA - OPO
1 stop14h 00mLufthansa
mié. 1/2112:30 pmOPO - SEA
1 stop31h 40mLufthansa
Deal found 7/28$618
This Scandinavian Airlines deal was found by Cheapflights users on 7/26. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/84:00 pmSEA - LIS
1 stop33h 00mScandinavian Airlines
jue. 9/257:00 amLIS - SEA
2 stops39h 00mScandinavian Airlines
Deal found 7/26$621
This FlightHub deal was found by Cheapflights users on 7/29. 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.
mar. 8/197:10 pmSEA - OPO
1 stop36h 40mTurkish Airlines
mar. 9/2310:50 amOPO - SEA
1 stop38h 25mTurkish Airlines
Deal found 7/29$625
This United Airlines deal was found by Cheapflights users on 7/29. 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.
mié. 10/297:00 amSEA - LIS
2 stops18h 10mUnited Airlines
mar. 11/1111:20 amLIS - SEA
3 stops43h 55mUnited Airlines
Deal found 7/29$627

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 julio 29, 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

mar. 10/14

11:29 am-2:50 pm

2 stops19h 21m

Lisbon Humberto Delgado

jue. 12/11

10:00 am-10:16 pm

1 stop20h 16m

$576

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

mié. 10/22

9:45 am-9:05 am

1 stop15h 20m

Lisbon Humberto Delgado

dom. 11/9

11:05 am-10:30 pm

1 stop19h 25m

$595

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

lun. 9/8

7:35 pm-9:35 pm

1 stop18h 00m

Lisbon Humberto Delgado

mar. 9/16

10:15 pm-5:50 pm

1 stop27h 35m

$606

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

sáb. 8/9

11:30 pm-9:20 pm

1 stop13h 50m

Lisbon Humberto Delgado

dom. 8/31

10:25 pm-11:25 am

1 stop21h 00m

$607

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

vie. 10/17

5:30 am-11:05 am

2 stops21h 35m

Lisbon Humberto Delgado

dom. 11/9

5:00 am-7:16 pm

2 stops22h 16m

$610

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

lun. 9/8

4:00 pm-9:00 am

1 stop33h 00m

Lisbon Humberto Delgado

jue. 9/25

7:00 am-2:00 pm

2 stops39h 00m

$621

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 8/19

7:10 pm-3:50 pm

1 stop36h 40m

Porto

mar. 9/23

10:50 am-5:15 pm

1 stop38h 25m

$625

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

mié. 10/1

7:10 pm-3:30 pm

1 stop36h 20m

Lisbon Humberto Delgado

mar. 10/28

11:30 am-6:05 pm

1 stop37h 35m

$638

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

lun. 10/20

11:40 pm-9:20 am

2 stops25h 40m

Lisbon Humberto Delgado

mar. 10/28

5:00 am-1:10 pm

1 stop15h 10m

$639

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

mié. 10/22

6:50 pm-9:50 pm

1 stop19h 00m

Lisbon Humberto Delgado

mié. 10/29

3:55 pm-1:10 pm

1 stop28h 15m

$645

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 51 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 $612). Flying from Seattle to Portugal in June is currently the most expensive (average of $1,129). 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 julio 29, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Portugal as you normally would.

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 julio 29, 2025.
Get a feel of what it's like to fly with Delta, KLM, and Air France 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
8.0
Very good
7,977 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,977 reviews
Delta
8.0
Very good
7,977 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,977 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,977 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,683 reviews
Delta
8.0
Very good
7,977 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,899 reviews
Delta
8.0
Very good
7,977 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

  • 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 $346. Users have also found prices from $396 and $469 on Scandinavian Airlines 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 - Ponta Delgada Nordela 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 $612). Flying from Seattle to Portugal in June is currently the most expensive (average of $1,129). 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 julio 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$466Average$644FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$571Average$1,026FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$581Average$1,052FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$621Average$1,064FlexibilityNo cancel feeOn-time71%
DeltaCheapest$636Average$1,022FlexibilityNo cancel feeOn-timeN/A
Turkish AirlinesCheapest$646Average$804FlexibilityNo cancel feeOn-time77%
KLMCheapest$648Average$1,012FlexibilityNo cancel feeOn-time75%
Air FranceCheapest$649Average$994FlexibilityNo cancel feeOn-time77%
Scandinavian AirlinesCheapest$652Average$828FlexibilityNo cancel feeOn-time77%
Aer LingusCheapest$660Average$969FlexibilityNo cancel feeOn-timeN/A

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