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$355+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
LIS — SEA
may. 6 — may. 131
mar. 5/6
mar. 5/13
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 mayo 1, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$712
(FlightHub)

One-way from

$355
(Kiwi.com)

Popular in

November

Cheapest in

December

Average price

$809
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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High demand for flights, 1% potential price rise
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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 May 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 mayo 1, 2025.

This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/56:45 amLIS - SEA
1 stop15h 05mMultiple Airlines
vie. 9/194:20 pmSEA - LIS
1 stop32h 40mMultiple Airlines
Deal found 4/30$712
This British Airways 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 5/195:05 pmLIS - SEA
1 stop26h 05mBritish Airways
mar. 6/31:30 pmSEA - LIS
1 stop25h 30mBritish Airways
Deal found 5/1$756
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 5/195:00 amLIS - SEA
1 stop18h 57mDelta
mar. 6/37:25 amSEA - LIS
2 stops17h 25mDelta
Deal found 4/30$817
This KLM 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 6/16:20 pmOPO - SEA
1 stop25h 20mKLM
dom. 6/155:35 pmSEA - OPO
1 stop14h 00mKLM
Deal found 4/30$837
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.
jue. 10/306:00 amOPO - SEA
2 stops22h 12mUnited Airlines
sáb. 12/1311:59 pmSEA - OPO
2 stops31h 16mUnited Airlines
Deal found 4/30$863
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.
lun. 5/195:05 amLIS - SEA
1 stop15h 20mUnited Airlines
mar. 6/35:14 pmSEA - LIS
2 stops31h 06mUnited Airlines
Deal found 4/30$865
This SWISS 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 5/195:55 amLIS - SEA
2 stops23h 36mSWISS
mar. 6/31:45 pmSEA - LIS
2 stops17h 00mSWISS
Deal found 5/1$870
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 6/16:15 amOPO - SEA
1 stop18h 44mMultiple Airlines
dom. 6/152:55 pmSEA - OPO
2 stops34h 40mMultiple Airlines
Deal found 4/30$894
This lol.travel 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/2110:50 amOPO - SEA
1 stop38h 25mTurkish Airlines
sáb. 10/2512:30 pmSEA - OPO
1 stop19h 55mTurkish Airlines
Deal found 4/30$896
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 6/115:05 amLIS - SEA
2 stops19h 54mLufthansa
mié. 6/181:45 pmSEA - LIS
2 stops37h 20mLufthansa
Deal found 4/30$913
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 5/196:35 amLIS - SEA
2 stops24h 34mAmerican Airlines
mar. 6/37:35 pmSEA - LIS
1 stop18h 00mAmerican Airlines
Deal found 5/1$918
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 6/310:55 amLIS - SEA
1 stop38h 20mTurkish Airlines
vie. 6/67:10 pmSEA - LIS
1 stop36h 20mTurkish Airlines
Deal found 4/30$927

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 mayo 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

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

vie. 9/5

6:45 am-1:50 pm

1 stop15h 05m

Seattle/Tacoma Intl

vie. 9/19

4:20 pm-9:00 am

1 stop32h 40m

$712

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

lun. 5/19

5:05 pm-11:10 am

1 stop26h 05m

Seattle/Tacoma Intl

mar. 6/3

1:30 pm-11:00 pm

1 stop25h 30m

$756

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

lun. 5/19

5:00 am-3:57 pm

1 stop18h 57m

Seattle/Tacoma Intl

mar. 6/3

7:25 am-8:50 am

2 stops17h 25m

$817

PortoSeattle

OPO - SEA

OPOSEA

Porto

dom. 6/1

6:20 pm-11:40 am

1 stop25h 20m

Seattle/Tacoma Intl

dom. 6/15

5:35 pm-3:35 pm

1 stop14h 00m

$837

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

lun. 5/19

5:05 am-12:25 pm

1 stop15h 20m

Seattle/Tacoma Intl

mar. 6/3

5:14 pm-8:20 am

2 stops31h 06m

$865

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

lun. 5/19

5:55 am-9:31 pm

2 stops23h 36m

Seattle/Tacoma Intl

mar. 6/3

1:45 pm-2:45 pm

2 stops17h 00m

$870

PortoSeattle

OPO - SEA

OPOSEA

Porto

sáb. 8/30

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

sáb. 12/13

7:00 am-3:15 pm

2 stops24h 15m

$875

PortoSeattle

OPO - SEA

OPOSEA

Porto

dom. 6/1

6:15 am-4:59 pm

1 stop18h 44m

Seattle/Tacoma Intl

dom. 6/15

2:55 pm-9:35 am

2 stops34h 40m

$894

PortoSeattle

OPO - SEA

OPOSEA

Porto

mar. 10/21

10:50 am-5:15 pm

1 stop38h 25m

Seattle/Tacoma Intl

sáb. 10/25

12:30 pm-4:25 pm

1 stop19h 55m

$896

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

mié. 6/11

5:05 am-4:59 pm

2 stops19h 54m

Seattle/Tacoma Intl

mié. 6/18

1:45 pm-11:05 am

2 stops37h 20m

$913

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 30 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 $405). 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 mayo 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 mayo 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
7,934 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

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
7,934 reviews
Delta
8.0
Very good
7,934 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

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
1,334 reviews
Delta
8.0
Very good
7,934 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

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
1,275 reviews
Delta
8.0
Very good
7,934 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

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
SWISS
7.5
Good
1,588 reviews
Delta
8.0
Very good
7,934 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

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
8,696 reviews
Delta
8.0
Very good
7,934 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

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?

    $570 is the cheapest one-way deal found within the past few days, from Aer Lingus. You may also be able to find cheap deals on Turkish Airlines and Finnair, with prices starting from $677 and $733, 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 $405). 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
Ocean Shores
Lacey
Leavenworth
Federal Way
Olympia
Shoreline
Cle Elum
Centralia
Kent
Lynnwood
Aberdeen
Shelton
Silverdale
Redmond
Issaquah

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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 6 airlines flying from Portugal to Seattle

Discover the top 6 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 mayo 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$717Average$823FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$720Average$1,084FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$738Average$867FlexibilityNo cancel feeOn-time69%
KLMCheapest$756Average$848FlexibilityNo cancel feeOn-time75%
Air FranceCheapest$762Average$1,067FlexibilityNo cancel feeOn-time77%
DeltaCheapest$765Average$859FlexibilityNo cancel feeOn-timeN/A

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