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Portugal

$294+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$708
(American Airlines)

One-way from

$294
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$1,079
Provider with most accurate pricing for Seattle/Tacoma Intl-Lisbon Humberto Delgado flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Lisbon Humberto Delgado flights.
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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 ($194 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in May 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 May 1, 2025.

This American Airlines deal was found by Cheapflights users on 4/30. 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.
Thu 10/98:20 pmSEA - LIS
1 stop18h 45mAmerican Airlines
Thu 11/206:30 amLIS - SEA
2 stops18h 25mAmerican Airlines
Deal found 4/30$708
This Gotogate deal was found by Cheapflights users on 4/30. 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.
Wed 8/2010:00 amSEA - OPO
2 stops15h 20mLufthansa
Tue 9/212:50 pmOPO - SEA
2 stops32h 15mLufthansa
Deal found 4/30$714
This Scandinavian Airlines deal was found by Cheapflights users on 5/1. 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.
Sun 8/174:00 pmSEA - LIS
1 stop19h 25mScandinavian Airlines
Wed 8/277:15 amLIS - SEA
1 stop14h 35mScandinavian Airlines
Deal found 5/1$715
This Gotogate deal was found by Cheapflights users on 4/30. 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.
Wed 8/207:20 amSEA - OPO
1 stop18h 00mMultiple Airlines
Tue 9/212:50 pmOPO - SEA
2 stops32h 15mMultiple Airlines
Deal found 4/30$716
This United Airlines deal was found by Cheapflights users on 4/30. 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.
Fri 10/175:00 amSEA - LIS
2 stops22h 05mUnited Airlines
Thu 10/3011:00 amLIS - SEA
2 stops36h 38mUnited Airlines
Deal found 4/30$720
This Kiwi.com deal was found by Cheapflights users on 4/30. 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.
Tue 8/127:35 pmSEA - LIS
1 stop18h 00mMultiple Airlines
Tue 8/199:35 amLIS - SEA
1 stop16h 15mMultiple Airlines
Deal found 4/30$721
This American Airlines deal was found by Cheapflights users on 4/30. 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.
Tue 8/51:33 pmSEA - OPO
2 stops18h 22mAmerican Airlines
Fri 8/228:15 amOPO - SEA
2 stops21h 17mAmerican Airlines
Deal found 4/30$722
This United Airlines deal was found by Cheapflights users on 4/30. 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 8/207:20 amSEA - OPO
1 stop18h 00mUnited Airlines
Tue 9/212:50 pmOPO - SEA
2 stops30h 41mUnited Airlines
Deal found 4/30$725
This Orbitz deal was found by Cheapflights users on 4/30. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/136:18 amSEA - LIS
2 stops21h 32mIberia
Thu 8/2112:30 pmLIS - SEA
2 stops20h 14mIberia
Deal found 4/30$725
This Air Canada deal was found by Cheapflights users on 4/30. 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.
Wed 9/1710:00 amSEA - OPO
2 stops15h 20mAir Canada
Wed 9/246:00 amOPO - SEA
2 stops24h 16mAir Canada
Deal found 4/30$734
This Icelandair deal was found by Cheapflights users on 5/1. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/211:30 pmSEA - LIS
1 stop13h 50mIcelandair
Sun 8/1010:20 pmLIS - SEA
1 stop21h 05mIcelandair
Deal found 5/1$742
This SWISS deal was found by Cheapflights users on 4/30. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/191:45 pmSEA - OPO
2 stops34h 00mSWISS
Wed 9/312:20 pmOPO - SEA
2 stops38h 16mSWISS
Deal found 4/30$761

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 May 1, 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 10/9

8:20 pm-11:05 pm

1 stop18h 45m

Lisbon Humberto Delgado

Thu 11/20

6:30 am-4:55 pm

2 stops18h 25m

$708

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 8/20

10:00 am-9:20 am

2 stops15h 20m

Porto

Tue 9/2

12:50 pm-1:05 pm

2 stops32h 15m

$714

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 8/17

4:00 pm-7:25 pm

1 stop19h 25m

Lisbon Humberto Delgado

Wed 8/27

7:15 am-1:50 pm

1 stop14h 35m

$715

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 8/20

7:20 am-9:20 am

1 stop18h 00m

Porto

Tue 9/2

12:50 pm-1:05 pm

2 stops32h 15m

$716

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 10/17

5:00 am-11:05 am

2 stops22h 05m

Lisbon Humberto Delgado

Thu 10/30

11:00 am-4:38 pm

2 stops36h 38m

$720

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 8/12

7:35 pm-9:35 pm

1 stop18h 00m

Lisbon Humberto Delgado

Tue 8/19

9:35 am-5:50 pm

1 stop16h 15m

$721

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 8/5

1:33 pm-3:55 pm

2 stops18h 22m

Porto

Fri 8/22

8:15 am-9:32 pm

2 stops21h 17m

$722

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 8/13

6:18 am-11:50 am

2 stops21h 32m

Lisbon Humberto Delgado

Thu 8/21

12:30 pm-12:44 am

2 stops20h 14m

$725

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 8/20

7:20 am-9:20 am

1 stop18h 00m

Porto

Tue 9/2

12:50 pm-11:31 am

2 stops30h 41m

$725

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 9/17

10:00 am-9:20 am

2 stops15h 20m

Porto

Wed 9/24

6:00 am-10:16 pm

2 stops24h 16m

$734

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

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 $612). Flying from Seattle to Portugal in June is currently the most expensive (average of $1,178). 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 May 1, 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 May 1, 2025.
Read through reviews of airlines operating flights from Seattle to Portugal, such as Delta, KLM and SWISS. 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
7,934 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,934 reviews
Delta
8.0
Very good
7,934 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,334 reviews
Delta
8.0
Very good
7,934 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,588 reviews
Delta
8.0
Very good
7,934 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.4
Good
1,446 reviews
Delta
8.0
Very good
7,934 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,696 reviews
Delta
8.0
Very good
7,934 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 $337. Users have also found prices from $417 and $497 on Scandinavian Airlines and Aer Lingus, 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 $1,178). 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$466Average$652FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$581Average$1,052FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$632Average$1,091FlexibilityNo cancel feeOn-time76%
DeltaCheapest$636Average$1,081FlexibilityNo cancel feeOn-timeN/A
Aer LingusCheapest$639Average$963FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$643Average$1,022FlexibilityNo cancel feeOn-time71%
KLMCheapest$649Average$991FlexibilityNo cancel feeOn-time75%
Scandinavian AirlinesCheapest$652Average$821FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$699Average$1,211FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$703Average$1,048FlexibilityNo cancel feeOn-time67%

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