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$373+ Cheap flights from Portugal to Seattle (SEA)

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 11/23. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — SEA
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheap flight deals from Portugal to Seattle

Keep the following information in mind while searching for Portugal to Seattle flight deals. Data was last updated July 30, 2025.

Round-trip from

$662
(Rumbo)

One-way from

$404
(Kiwi.com)

Popular in

July

Cheapest in

April

Average price

$1,211
From Portugal to Seattle/Tacoma Intl
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One-way flight from Portugal to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 14% potential increase in price ($155 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($26 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 Portugal to Seattle

Cheapest flights from Portugal to Seattle
Explore the most affordable flight options available from Portugal to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

This Rumbo 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/510:15 pmLIS - SEA
1 stop27h 35mAer Lingus
Sat 9/207:35 pmSEA - LIS
1 stop18h 00mAer Lingus
Deal found 7/29$662
This Delta deal was found by Cheapflights users on 7/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/55:00 amLIS - SEA
1 stop14h 45mDelta
Thu 9/189:40 amSEA - LIS
2 stops21h 10mDelta
Deal found 7/30$767
This KLM deal was found by Cheapflights users on 7/30. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/175:00 amLIS - SEA
1 stop14h 50mMultiple Airlines
Thu 10/236:35 pmSEA - LIS
1 stop15h 15mMultiple Airlines
Deal found 7/30$771
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/281:35 pmOPO - SEA
2 stops32h 15mMultiple Airlines
Fri 9/54:00 pmSEA - OPO
2 stops18h 30mMultiple Airlines
Deal found 7/29$783
This KLM 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/286:30 amOPO - SEA
1 stop17h 25mKLM
Fri 9/56:45 pmSEA - OPO
1 stop17h 50mKLM
Deal found 7/29$788
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Thu 8/286:00 amOPO - SEA
1 stop13h 55mUnited Airlines
Fri 9/511:10 pmSEA - OPO
1 stop23h 45mUnited Airlines
Deal found 7/30$848
This British Airways 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/511:05 amLIS - SEA
1 stop18h 59mBritish Airways
Sat 9/208:20 pmSEA - LIS
1 stop29h 45mBritish Airways
Deal found 7/29$854
This United Airlines deal was found by Cheapflights users on 7/30. 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 10/175:05 amLIS - SEA
1 stop14h 50mUnited Airlines
Thu 10/235:00 amSEA - LIS
2 stops19h 20mUnited Airlines
Deal found 7/30$856
This SWISS deal was found by Cheapflights users on 7/30. 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.
Fri 10/175:55 amLIS - SEA
2 stops20h 41mSWISS
Wed 10/221:00 pmSEA - LIS
2 stops26h 20mSWISS
Deal found 7/30$868
This Booking.com deal was found by Cheapflights users on 7/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/76:15 amLIS - SEA
2 stops24h 01mAir Canada
Mon 9/225:30 amSEA - LIS
2 stops19h 50mAir Canada
Deal found 7/30$870
This Virgin Atlantic 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1210:00 amLIS - SEA
1 stop20h 25mVirgin Atlantic
Fri 9/197:55 pmSEA - LIS
2 stops28h 05mVirgin Atlantic
Deal found 7/29$908
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/165:55 amLIS - SEA
1 stop19h 20mTurkish Airlines
Wed 9/177:10 pmSEA - LIS
1 stop30h 35mTurkish Airlines
Deal found 7/29$922

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portugal to Seattle 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 July 30, 2025.
Use the filters below to find and compare flights from Portugal to Seattle that are best for you.

Fly from

Portugal

Fly to

Seattle

Route

Depart

Return

Price

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Fri 9/5

10:15 pm-5:50 pm

1 stop27h 35m

Seattle/Tacoma Intl

Sat 9/20

7:35 pm-9:35 pm

1 stop18h 00m

$662

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Fri 9/5

5:00 am-11:45 am

1 stop14h 45m

Seattle/Tacoma Intl

Thu 9/18

9:40 am-2:50 pm

2 stops21h 10m

$767

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Fri 10/17

5:00 am-11:50 am

1 stop14h 50m

Seattle/Tacoma Intl

Thu 10/23

6:35 pm-5:50 pm

1 stop15h 15m

$771

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 8/28

1:35 pm-1:50 pm

2 stops32h 15m

Seattle/Tacoma Intl

Fri 9/5

4:00 pm-6:30 pm

2 stops18h 30m

$783

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 8/28

6:30 am-3:55 pm

1 stop17h 25m

Seattle/Tacoma Intl

Fri 9/5

6:45 pm-8:35 pm

1 stop17h 50m

$788

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 8/28

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Fri 9/5

10:55 pm-6:55 am

2 stops24h 00m

$848

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Fri 9/5

11:05 am-10:04 pm

1 stop18h 59m

Seattle/Tacoma Intl

Sat 9/20

8:20 pm-10:05 am

1 stop29h 45m

$854

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Fri 10/17

5:05 am-11:55 am

1 stop14h 50m

Seattle/Tacoma Intl

Thu 10/23

5:00 am-8:20 am

2 stops19h 20m

$856

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Fri 10/17

5:55 am-6:36 pm

2 stops20h 41m

Seattle/Tacoma Intl

Wed 10/22

1:00 pm-11:20 pm

2 stops26h 20m

$868

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Sun 9/7

6:15 am-10:16 pm

2 stops24h 01m

Seattle/Tacoma Intl

Mon 9/22

5:30 am-9:20 am

2 stops19h 50m

$870

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 29 results
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Best time to book a flight from Portugal to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Portugal 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 Portugal to Seattle

What is the cheapest month to book a flight from Portugal to Seattle?

Currently, January is the cheapest month in which you can book a flight from Portugal to Seattle (average of $238). Flying from Portugal to Seattle in June is currently the most expensive (average of $389). 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 PT to SEA?

Find hourly flight availability from Portugal to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 30, 2025.

When flying from Portugal to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated July 30, 2025.
Read reviews from past customers who have flown Delta, KLM, and Austrian Airlines from Portugal to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Austrian Airlines
7.6
Good
823 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
SWISS
7.5
Good
1,686 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

Related info for your journey

Find useful and relevant information for your journey from Portugal to Seattle. 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 into for flights to Seattle from Portugal?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl (SEA) is the airport most travelers will use when flying to Seattle from Portugal.

  • What are the cheapest airlines to fly from Portugal to Seattle one-way?

    $680 is the cheapest one-way deal found within the past few days, from Turkish Airlines. You may also be able to find cheap deals on Lufthansa and Air Europa, with prices starting from $729 and $756, respectively.

  • Can I find deals for flights from Portugal to Seattle that include hotel bookings?

    Yes. In addition to deals on Portugal to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portugal to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portugal to Seattle.

  • Can I find deals for business class flights from Portugal to Seattle?

    Yes. Cheapflights offers flight deals from Portugal to Seattle 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 Portugal to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Portugal to Seattle (average of $238). Flying from Portugal to Seattle in June is currently the most expensive (average of $389). 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

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
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Puyallup
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Shelton

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Alternative routes for Portugal to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Portugal to Seattle

Discover the top 5 airlines that operate flights from Portugal to Seattle. 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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$720Average$1,084FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$738Average$863FlexibilityNo cancel feeOn-time69%
Air FranceCheapest$762Average$1,151FlexibilityNo cancel feeOn-time77%
DeltaCheapest$775Average$888FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$794Average$968FlexibilityNo cancel feeOn-time75%

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