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Portugal

$291+ 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 9/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$663
(FlightHub)

One-way from

$291
(Trip.com)

Popular in

June

Cheapest in

January

Average price

$1,368
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. 17% potential increase in price ($207 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($37 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This United Airlines deal was found by Cheapflights users on 6/12. 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.
Thu 10/305:05 amSEA - LIS
2 stops20h 05mUnited Airlines
Sat 11/811:00 amLIS - SEA
2 stops21h 59mUnited Airlines
Deal found 6/12$548
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Fri 10/249:45 amSEA - LIS
1 stop15h 20mMultiple Airlines
Fri 11/147:05 amLIS - SEA
1 stop17h 50mMultiple Airlines
Deal found 6/12$561
This Air France deal was found by Cheapflights users on 6/12. 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 10/227:20 amSEA - LIS
1 stop16h 40mAir France
Sun 11/911:15 amLIS - SEA
1 stop18h 58mAir France
Deal found 6/12$571
This CheapOair deal was found by Cheapflights users on 6/12. 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.
Thu 10/307:50 pmSEA - LIS
1 stop19h 05mBritish Airways
Sat 11/810:30 amLIS - SEA
1 stop19h 19mBritish Airways
Deal found 6/12$572
This Delta deal was found by Cheapflights users on 6/12. 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.
Fri 10/246:05 amSEA - LIS
2 stops21h 10mDelta
Fri 11/145:30 amLIS - SEA
1 stop15h 45mDelta
Deal found 6/12$594
This FlightHub deal was found by Cheapflights users on 6/12. 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.
Fri 10/247:30 amSEA - LIS
2 stops16h 50mAir Canada
Fri 11/146:10 amLIS - SEA
2 stops20h 16mAir Canada
Deal found 6/12$629
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Mon 10/138:20 pmSEA - LIS
1 stop18h 50mAmerican Airlines
Tue 10/2811:10 amLIS - SEA
1 stop17h 34mAmerican Airlines
Deal found 6/12$653
This FlightHub deal was found by Cheapflights users on 6/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/187:15 pmSEA - OPO
2 stops39h 00mAir Canada
Sun 11/96:15 amOPO - SEA
2 stops40h 11mAir Canada
Deal found 6/11$655
This FlightHub deal was found by Cheapflights users on 6/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/167:10 pmSEA - OPO
1 stop36h 40mTurkish Airlines
Tue 9/304:50 pmOPO - SEA
1 stop32h 25mTurkish Airlines
Deal found 6/11$663
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/181:12 pmSEA - OPO
2 stops36h 33mUnited Airlines
Sun 11/912:40 pmOPO - SEA
1 stop31h 30mUnited Airlines
Deal found 6/10$670
This Mytrip deal was found by Cheapflights users on 6/10. 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.
Wed 8/65:30 amSEA - FAO
3 stops30h 50mMultiple Airlines
Wed 8/139:55 pmFAO - SEA
2 stops30h 46mMultiple Airlines
Deal found 6/10$671
This FlightHub deal was found by Cheapflights users on 6/12. 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.
Tue 9/27:10 pmSEA - LIS
1 stop30h 45mTurkish Airlines
Tue 9/165:55 amLIS - SEA
1 stop19h 20mTurkish Airlines
Deal found 6/12$675

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 June 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

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Thu 10/30

5:05 am-8:10 am

2 stops20h 05m

Lisbon Humberto Delgado

Sat 11/8

11:00 am-12:59 am

2 stops21h 59m

$548

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 10/24

9:45 am-9:05 am

1 stop15h 20m

Lisbon Humberto Delgado

Fri 11/14

7:05 am-4:55 pm

1 stop17h 50m

$561

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 10/22

7:20 am-8:00 am

1 stop16h 40m

Lisbon Humberto Delgado

Sun 11/9

11:15 am-10:13 pm

1 stop18h 58m

$571

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Thu 10/30

7:50 pm-9:55 pm

1 stop19h 05m

Lisbon Humberto Delgado

Sat 11/8

10:30 am-9:49 pm

1 stop19h 19m

$572

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 10/24

6:05 am-11:15 am

2 stops21h 10m

Lisbon Humberto Delgado

Fri 11/14

5:30 am-1:15 pm

1 stop15h 45m

$594

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 10/24

7:30 am-8:20 am

2 stops16h 50m

Lisbon Humberto Delgado

Fri 11/14

6:10 am-6:26 pm

2 stops20h 16m

$629

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 10/13

8:20 pm-11:10 pm

1 stop18h 50m

Lisbon Humberto Delgado

Tue 10/28

11:10 am-9:44 pm

1 stop17h 34m

$653

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 10/18

7:15 pm-6:15 pm

2 stops39h 00m

Porto

Sun 11/9

6:15 am-2:26 pm

2 stops40h 11m

$655

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 9/16

7:10 pm-10:05 am

1 stop30h 55m

Porto

Tue 9/30

10:50 am-5:15 pm

1 stop38h 25m

$663

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 10/18

1:12 pm-9:45 am

2 stops36h 33m

Porto

Sun 11/9

12:40 pm-12:10 pm

1 stop31h 30m

$670

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 59 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 $1,136). 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 June 12, 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.

Rainfall in Portugal by month

Plan your trip to Portugal by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Portugal ranges from 0.2 - 4.8 inches per month. December is typically the wettest month, when rainfall can reach 4.8 in. July is typically the driest time to visit Portugal when rainfall is around 0.2 in.

Temperature in Portugal by month

Plan your trip to Portugal by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Portugal, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

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 June 12, 2025.
Read through reviews of airlines operating flights from Seattle to Portugal, such as Delta, KLM and Air France. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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
7,946 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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
1,358 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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
1,463 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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
1,623 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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
8,790 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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 Air Canada. According to our data, you can fly for as low as $336. Users have also found prices from $338 and $351 on Icelandair and Lufthansa, 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 $1,136). 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$477Average$650FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$581Average$1,066FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$581Average$1,034FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$619Average$1,214FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$621Average$1,027FlexibilityNo cancel feeOn-time71%
DeltaCheapest$636Average$1,056FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$648Average$989FlexibilityNo cancel feeOn-time75%
Scandinavian AirlinesCheapest$652Average$828FlexibilityNo cancel feeOn-time77%
Aer LingusCheapest$654Average$972FlexibilityNo cancel feeOn-timeN/A
Air FranceCheapest$688Average$1,035FlexibilityNo cancel feeOn-time77%

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