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$325+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — SEA
Apr 6 — Apr 131
Sun 4/6
Sun 4/13
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 April 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$490
(Booking.com)

One-way from

$325
(Kiwi.com)

Popular in

July

Cheapest in

April

Average price

$794
Provider with most accurate pricing for Lisbon Humberto Delgado-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Lisbon Humberto Delgado-Seattle/Tacoma Intl flights.
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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. 16% potential increase in price ($194 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($19 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 1, 2025.

This Booking.com deal was found by Cheapflights users on 3/31. 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.
Fri 5/235:55 pmOPO - SEA
1 stop27h 55mScandinavian Airlines
Sat 5/314:00 pmSEA - OPO
1 stop35h 10mScandinavian Airlines
Deal found 3/31$490
This FlightHub deal was found by Cheapflights users on 3/31. 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 9/56:55 amLIS - SEA
1 stop14h 55mMultiple Airlines
Fri 9/194:20 pmSEA - LIS
1 stop32h 40mMultiple Airlines
Deal found 3/31$598
This Mytrip deal was found by Cheapflights users on 3/31. 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.
Fri 5/2310:20 amOPO - SEA
2 stops35h 30mMultiple Airlines
Sat 5/314:00 pmSEA - OPO
3 stops34h 00mMultiple Airlines
Deal found 3/31$701
This Booking.com deal was found by Cheapflights users on 3/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/811:05 amLIS - SEA
1 stop18h 45mBritish Airways
Sat 5/241:35 pmSEA - LIS
1 stop25h 35mBritish Airways
Deal found 3/29$738
This American Airlines deal was found by Cheapflights users on 3/30. 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.
Fri 9/197:20 amLIS - SEA
1 stop19h 00mAmerican Airlines
Fri 12/126:50 pmSEA - LIS
1 stop19h 35mAmerican Airlines
Deal found 3/30$742
This Finnair deal was found by Cheapflights users on 3/30. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/74:30 pmLIS - SEA
1 stop31h 30mFinnair
Mon 6/25:40 pmSEA - LIS
1 stop38h 00mFinnair
Deal found 3/30$744
This Delta deal was found by Cheapflights users on 3/30. 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.
Wed 6/115:00 amLIS - SEA
1 stop14h 40mDelta
Wed 6/187:20 amSEA - LIS
1 stop16h 40mDelta
Deal found 3/30$784
This Air France deal was found by Cheapflights users on 3/30. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/26:50 pmLIS - SEA
1 stop24h 25mAir France
Mon 6/167:50 amSEA - LIS
1 stop18h 55mAir France
Deal found 3/30$796
This Booking.com deal was found by Cheapflights users on 3/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/85:05 amLIS - SEA
2 stops21h 28mAir Canada
Sat 5/2411:30 amSEA - LIS
2 stops37h 50mAir Canada
Deal found 3/29$800
This Delta deal was found by Cheapflights users on 3/31. 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 5/236:40 amOPO - SEA
1 stop17h 17mDelta
Sat 5/3111:55 amSEA - OPO
2 stops19h 35mDelta
Deal found 3/31$804
This United Airlines deal was found by Cheapflights users on 3/30. 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 5/75:05 amLIS - SEA
2 stops17h 08mUnited Airlines
Wed 5/287:00 amSEA - LIS
2 stops20h 05mUnited Airlines
Deal found 3/30$820
This Lufthansa deal was found by Cheapflights users on 3/30. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/65:05 amLIS - SEA
1 stop15h 20mLufthansa
Sun 6/16:50 pmSEA - LIS
1 stop19h 00mLufthansa
Deal found 3/30$825

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 April 1, 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

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 5/23

5:55 pm-1:50 pm

1 stop27h 55m

Seattle/Tacoma Intl

Sat 5/31

4:00 pm-11:10 am

1 stop35h 10m

$490

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Fri 9/5

6:55 am-1:50 pm

1 stop14h 55m

Seattle/Tacoma Intl

Fri 9/19

4:20 pm-9:00 am

1 stop32h 40m

$598

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 5/23

10:20 am-1:50 pm

2 stops35h 30m

Seattle/Tacoma Intl

Sat 5/31

4:00 pm-10:00 am

3 stops34h 00m

$701

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 5/8

11:05 am-9:50 pm

1 stop18h 45m

Seattle/Tacoma Intl

Sat 5/24

1:35 pm-11:10 pm

1 stop25h 35m

$738

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Fri 9/19

7:20 am-6:20 pm

1 stop19h 00m

Seattle/Tacoma Intl

Fri 12/12

6:50 pm-10:25 pm

1 stop19h 35m

$742

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Wed 5/7

4:30 pm-4:00 pm

1 stop31h 30m

Seattle/Tacoma Intl

Mon 6/2

5:40 pm-3:40 pm

1 stop38h 00m

$744

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Tue 5/6

5:00 am-3:57 pm

1 stop18h 57m

Seattle/Tacoma Intl

Sat 5/31

6:07 pm-10:50 pm

1 stop20h 43m

$782

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Wed 6/11

5:00 am-11:40 am

1 stop14h 40m

Seattle/Tacoma Intl

Wed 6/18

7:20 am-8:00 am

1 stop16h 40m

$784

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Mon 6/2

6:50 pm-11:15 am

1 stop24h 25m

Seattle/Tacoma Intl

Mon 6/16

7:50 am-10:45 am

1 stop18h 55m

$796

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 5/8

5:05 am-6:33 pm

2 stops21h 28m

Seattle/Tacoma Intl

Sat 5/24

11:30 am-9:20 am

2 stops37h 50m

$800

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 38 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 July is currently the most expensive (average of $411). 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 April 1, 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.

Rainfall in Seattle by month

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

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

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

If weather is an important factor for your trip to Seattle, 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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

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 April 1, 2025.
See what other customers who have flown with Delta, KLM and Finnair from Portugal to Seattle have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,899 reviews

Overall

8.0

Comfort

8.0

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,899 reviews
Delta
8.0
Very good
7,899 reviews

Overall

8.0

Comfort

8.0

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,321 reviews
Delta
8.0
Very good
7,899 reviews

Overall

8.0

Comfort

8.0

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,267 reviews
Delta
8.0
Very good
7,899 reviews

Overall

8.0

Comfort

8.0

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.4
Good
1,425 reviews
Delta
8.0
Very good
7,899 reviews

Overall

8.0

Comfort

8.0

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,614 reviews
Delta
8.0
Very good
7,899 reviews

Overall

8.0

Comfort

8.0

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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?

    $643 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 Aer Lingus and Finnair, with prices starting from $647 and $680, 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 July is currently the most expensive (average of $411). 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 Portugal?

Book flights to Portugal if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Lakewood
Renton
Lacey
Ocean Shores
Leavenworth
Federal Way
Olympia
Cle Elum
Centralia
Mukilteo
Aberdeen
Shoreline
Lynnwood
Shelton
Silverdale
Redmond
Monroe

Browse thousands of different options on Cheapflights for your next trip

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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 April 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$717Average$823FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$720Average$1,074FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$738Average$867FlexibilityNo cancel feeOn-time69%
DeltaCheapest$756Average$859FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$756Average$848FlexibilityNo cancel feeOn-time75%
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