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$249+ 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 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
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 septiembre 11, 2025.

Round-trip from

$524
(lol.travel)

One-way from

$249
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$897
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 ($34 potential savings vs. average RT price).
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Average for round-trip flights in September 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 septiembre 11, 2025.

This lol.travel deal was found by Cheapflights users on 9/11. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/2012:00 pmSEA - OPO
1 stop13h 45mUnited Airlines
mié. 11/512:35 pmOPO - SEA
1 stop18h 06mUnited Airlines
Deal found 9/11$524
This Mytrip deal was found by Cheapflights users on 9/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/810:00 amSEA - OPO
3 stops22h 35mMultiple Airlines
mié. 10/2210:00 pmOPO - SEA
3 stops31h 45mMultiple Airlines
Deal found 9/10$576
This Iberia deal was found by Cheapflights users on 9/11. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/201:35 pmSEA - OPO
2 stops18h 20mIberia
mié. 11/58:20 amOPO - SEA
2 stops22h 58mIberia
Deal found 9/11$577
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/201:30 pmSEA - OPO
1 stop18h 00mDelta
mié. 11/511:25 amOPO - SEA
2 stops30h 53mDelta
Deal found 9/11$587
This Scandinavian Airlines deal was found by Cheapflights users on 9/10. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/132:11 pmSEA - FAO
2 stops42h 09mScandinavian Airlines
mar. 11/2510:50 amFAO - SEA
2 stops44h 11mScandinavian Airlines
Deal found 9/10$588
This United deal was found by Cheapflights users on 9/11. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/1811:40 pmSEA - OPO
2 stops26h 05mMultiple Airlines
dom. 11/25:15 amOPO - SEA
1 stop15h 05mMultiple Airlines
Deal found 9/11$615
This KLM deal was found by Cheapflights users on 9/10. 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.
sáb. 10/254:00 pmSEA - FNC
1 stop34h 35mKLM
sáb. 11/16:40 pmFNC - SEA
2 stops28h 05mKLM
Deal found 9/10$616
This Mytrip deal was found by Cheapflights users on 9/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/107:00 pmSEA - FAO
2 stops17h 50mMultiple Airlines
sáb. 10/186:20 amFAO - SEA
2 stops22h 20mMultiple Airlines
Deal found 9/11$618
This FlightHub deal was found by Cheapflights users on 9/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/77:15 pmSEA - OPO
2 stops39h 15mMultiple Airlines
lun. 11/37:20 pmOPO - SEA
2 stops35h 55mMultiple Airlines
Deal found 9/10$628
This British Airways deal was found by Cheapflights users on 9/10. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/126:50 pmSEA - FAO
1 stop14h 55mBritish Airways
lun. 11/247:05 pmFAO - SEA
1 stop29h 50mBritish Airways
Deal found 9/10$630
This Air Canada deal was found by Cheapflights users on 9/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/187:15 pmSEA - OPO
2 stops36h 25mAir Canada
dom. 11/96:15 amOPO - SEA
2 stops35h 16mAir Canada
Deal found 9/10$633
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/104:20 pmSEA - FAO
1 stop17h 35mScandinavian Airlines
sáb. 10/187:35 pmFAO - SEA
2 stops26h 25mScandinavian Airlines
Deal found 9/10$641

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 septiembre 11, 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

lun. 10/20

8:00 am-9:45 am

2 stops17h 45m

Porto

mié. 11/5

12:35 pm-11:28 am

2 stops30h 53m

$555

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

dom. 11/9

11:59 pm-9:30 am

2 stops25h 31m

Porto

mié. 11/19

6:00 am-6:52 pm

2 stops20h 52m

$564

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 11/18

6:20 am-9:30 am

1 stop19h 10m

Porto

lun. 12/1

12:30 pm-12:10 pm

1 stop31h 40m

$569

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

dom. 11/9

11:59 pm-9:30 am

2 stops25h 31m

Porto

mié. 11/19

12:30 pm-12:10 pm

1 stop31h 40m

$574

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

lun. 10/20

1:30 pm-3:30 pm

1 stop18h 00m

Porto

mié. 11/5

11:25 am-10:18 am

2 stops30h 53m

$587

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

vie. 11/14

10:40 am-4:20 pm

2 stops21h 40m

Faro

mar. 11/25

10:50 am-11:01 pm

2 stops44h 11m

$588

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

vie. 11/28

7:00 am-9:30 am

2 stops18h 30m

Porto

mar. 12/16

6:00 am-8:54 pm

2 stops22h 54m

$614

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

lun. 10/20

1:30 pm-7:50 pm

1 stop22h 20m

Porto

mié. 11/5

6:30 pm-4:55 pm

1 stop30h 25m

$615

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

sáb. 10/25

4:00 pm-10:35 am

1 stop34h 35m

Funchal Madeira

sáb. 11/1

6:40 pm-3:45 pm

2 stops28h 05m

$616

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

vie. 11/28

6:20 am-9:30 am

1 stop19h 10m

Porto

mar. 12/16

1:45 pm-1:20 pm

1 stop31h 35m

$621

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 55 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 $1,127). 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 septiembre 11, 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 septiembre 11, 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
8.0
Very good
7,960 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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
7.4
Good
1,469 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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!
Lufthansa
6.8
Okay
7,409 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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!
British Airways
6.7
Okay
7,361 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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.

  • How long is the flight from Seattle to Portugal?

    For as low as $555, United Airlines can have you in Portugal from Seattle in 17h 45m. 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 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 $612). Flying from Seattle to Portugal in June is currently the most expensive (average of $1,127). 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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$466Average$645FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$543Average$1,029FlexibilityNo cancel feeOn-time67%
British AirwaysCheapest$565Average$1,017FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$587Average$961FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$611Average$1,087FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$611Average$1,289FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$627Average$1,061FlexibilityNo cancel feeOn-time71%
Aer LingusCheapest$627Average$967FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$632Average$947FlexibilityNo cancel feeOn-time75%
DeltaCheapest$647Average$1,023FlexibilityNo cancel feeOn-timeN/A

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