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Portugal

$299+ 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 5/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$626
(Mytrip)

One-way from

$299
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$792
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 ($198 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 March 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 March 28, 2025.

This Mytrip deal was found by Cheapflights users on 3/27. 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.
Sun 5/113:45 pmSEA - OPO
3 stops32h 15mMultiple Airlines
Sun 5/186:45 amOPO - SEA
2 stops21h 55mMultiple Airlines
Deal found 3/27$626
This United Airlines deal was found by Cheapflights users on 3/27. 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 10/2312:08 pmSEA - OPO
1 stop13h 37mUnited Airlines
Tue 11/412:30 pmOPO - SEA
1 stop31h 40mUnited Airlines
Deal found 3/27$697
This Gotogate deal was found by Cheapflights users on 3/27. 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 4/23:24 pmSEA - LIS
2 stops23h 56mSWISS
Tue 4/85:55 amLIS - SEA
2 stops24h 48mSWISS
Deal found 3/27$705
This United deal was found by Cheapflights users on 3/27. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/247:32 pmSEA - LIS
3 stops30h 48mUnited Airlines
Fri 11/1411:55 amLIS - SEA
2 stops36h 43mUnited Airlines
Deal found 3/27$707
This Kiwi.com deal was found by Cheapflights users on 3/27. 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.
Mon 5/511:38 amSEA - LIS
1 stop34h 27mMultiple Airlines
Wed 5/219:10 pmLIS - SEA
2 stops32h 50mMultiple Airlines
Deal found 3/27$708
This Justfly.com deal was found by Cheapflights users on 3/27. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/315:45 amSEA - LIS
2 stops20h 35mAir Canada
Sat 11/85:00 amLIS - SEA
2 stops21h 25mAir Canada
Deal found 3/27$725
This British Airways deal was found by Cheapflights users on 3/26. 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.
Sun 5/111:30 pmSEA - LIS
1 stop20h 25mBritish Airways
Sat 5/176:55 pmLIS - SEA
1 stop24h 35mBritish Airways
Deal found 3/26$726
This American Airlines deal was found by Cheapflights users on 3/27. 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 10/78:20 pmSEA - LIS
1 stop18h 40mAmerican Airlines
Tue 11/46:30 amLIS - SEA
2 stops18h 25mAmerican Airlines
Deal found 3/27$734
This FlightHub deal was found by Cheapflights users on 3/27. 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.
Wed 12/102:35 pmSEA - LIS
1 stop21h 45mIcelandair
Sun 1/49:20 pmLIS - SEA
1 stop27h 40mIcelandair
Deal found 3/27$755
This Iberia deal was found by Cheapflights users on 3/27. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/72:09 pmSEA - LIS
2 stops17h 56mIberia
Tue 11/46:30 amLIS - SEA
2 stops22h 45mIberia
Deal found 3/27$762
This oojo deal was found by Cheapflights users on 3/27. 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.
Wed 9/37:10 pmSEA - LIS
1 stop36h 20mTurkish Airlines
Tue 9/164:45 pmLIS - SEA
1 stop32h 30mTurkish Airlines
Deal found 3/27$771
This KLM deal was found by Cheapflights users on 3/27. 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.
Sat 3/297:30 amSEA - LIS
1 stop19h 15mKLM
Sun 4/67:30 pmLIS - SEA
1 stop24h 15mKLM
Deal found 3/27$786

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 March 28, 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

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 5/11

3:45 pm-8:00 am

3 stops32h 15m

Porto

Sun 5/18

6:45 am-8:40 pm

2 stops21h 55m

$626

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 4/2

3:24 pm-11:20 pm

2 stops23h 56m

Lisbon Humberto Delgado

Tue 4/8

5:55 am-10:43 pm

2 stops24h 48m

$705

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 5/5

11:38 am-6:05 am

1 stop34h 27m

Lisbon Humberto Delgado

Wed 5/21

9:10 pm-10:00 pm

2 stops32h 50m

$708

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 5/11

1:30 pm-5:55 pm

1 stop20h 25m

Lisbon Humberto Delgado

Sat 5/17

6:55 pm-11:30 am

1 stop24h 35m

$726

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 4/27

10:12 pm-10:30 am

2 stops28h 18m

Lisbon Humberto Delgado

Fri 5/9

5:05 am-6:33 pm

2 stops21h 28m

$798

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 5/7

7:00 am-9:45 am

2 stops18h 45m

Porto

Thu 5/15

6:00 am-12:25 pm

1 stop14h 25m

$803

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 4/22

7:10 pm-3:50 pm

1 stop36h 40m

Porto

Tue 5/20

4:50 pm-5:15 pm

1 stop32h 25m

$805

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Wed 5/7

7:00 pm-7:25 pm

2 stops16h 25m

Faro

Wed 5/14

7:00 am-8:40 pm

2 stops21h 40m

$806

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 4/28

2:15 pm-10:05 pm

1 stop23h 50m

Lisbon Humberto Delgado

Thu 5/8

5:05 am-6:33 pm

2 stops21h 28m

$812

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 4/22

3:24 pm-11:25 am

2 stops36h 01m

Porto

Tue 5/20

12:15 pm-6:33 pm

2 stops38h 18m

$812

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

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 $1,213). 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 March 28, 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 March 28, 2025.
Read through reviews of airlines operating flights from Seattle to Portugal, such as Delta, KLM and Finnair. 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
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

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
7,897 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

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
1,321 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

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.
Finnair
7.6
Good
1,267 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

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
1,570 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

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
1,424 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

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 TAP AIR PORTUGAL. According to our data, you can fly for as low as $368. Users have also found prices from $556 and $597 on Scandinavian Airlines and British Airways, 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 - Faro 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 $1,213). 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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$553Average$696FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$606Average$970FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$632Average$1,185FlexibilityNo cancel feeOn-time76%
DeltaCheapest$636Average$1,098FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$643Average$1,030FlexibilityNo cancel feeOn-time71%
KLMCheapest$649Average$1,002FlexibilityNo cancel feeOn-time75%
Scandinavian AirlinesCheapest$652Average$832FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$667Average$970FlexibilityNo cancel feeOn-time70%
Air CanadaCheapest$707Average$1,056FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$711Average$1,221FlexibilityNo cancel feeOn-time69%
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