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$330+ 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 4/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
feb. 25 — mar. 41
mar. 2/25
mar. 3/4
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 febrero 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$620
(Gotogate)

One-way from

$349
(Mytrip)

Popular in

June

Cheapest in

January

Average price

$772
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. 17% potential increase in price ($218 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in February 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 febrero 20, 2025.

This Gotogate deal was found by Cheapflights users on 2/19. 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.
mar. 4/16:05 amSEA - OPO
2 stops21h 20mMultiple Airlines
mié. 4/96:15 amOPO - SEA
1 stop18h 44mMultiple Airlines
Deal found 2/19$615
This United Airlines deal was found by Cheapflights users on 2/19. 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.
mar. 4/112:20 pmSEA - OPO
1 stop13h 25mUnited Airlines
mar. 4/86:00 amOPO - SEA
1 stop14h 25mUnited Airlines
Deal found 2/19$622
This KLM deal was found by Cheapflights users on 2/18. 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.
mar. 3/42:10 pmSEA - OPO
1 stop36h 20mKLM
mié. 3/124:10 pmOPO - SEA
1 stop27h 30mKLM
Deal found 2/18$631
This Gotogate deal was found by Cheapflights users on 2/20. 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.
mar. 4/12:15 pmSEA - OPO
1 stop17h 30mLufthansa
mié. 4/96:15 amOPO - SEA
1 stop18h 44mLufthansa
Deal found 2/20$632
This Delta deal was found by Cheapflights users on 2/20. 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. 3/171:35 pmSEA - OPO
1 stop14h 15mDelta
mar. 4/111:25 amOPO - SEA
1 stop36h 35mDelta
Deal found 2/20$637
This SWISS deal was found by Cheapflights users on 2/19. 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.
mar. 4/112:45 pmSEA - OPO
2 stops38h 40mSWISS
mié. 4/98:40 amOPO - SEA
2 stops20h 35mSWISS
Deal found 2/19$651
This Gotogate deal was found by Cheapflights users on 2/19. 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.
mar. 3/181:25 pmSEA - OPO
2 stops21h 15mBritish Airways
mié. 4/28:15 amOPO - SEA
2 stops22h 52mBritish Airways
Deal found 2/19$668
This Mytrip deal was found by Cheapflights users on 2/20. 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.
mar. 4/16:45 pmSEA - LIS
1 stop19h 45mMultiple Airlines
mar. 4/89:35 amLIS - SEA
1 stop15h 24mMultiple Airlines
Deal found 2/20$707
This United Airlines deal was found by Cheapflights users on 2/20. 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. 12/111:35 amSEA - LIS
1 stop13h 45mUnited Airlines
mié. 12/1011:00 amLIS - SEA
3 stops40h 12mUnited Airlines
Deal found 2/20$725
This oojo deal was found by Cheapflights users on 2/20. 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. 4/227:10 pmSEA - LIS
1 stop36h 15mTurkish Airlines
mar. 4/294:30 pmLIS - SEA
1 stop32h 45mTurkish Airlines
Deal found 2/20$726
This Gotogate deal was found by Cheapflights users on 2/20. 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.
mié. 4/25:45 amSEA - LIS
2 stops19h 35mAir Canada
mié. 4/911:25 amLIS - SEA
2 stops39h 03mAir Canada
Deal found 2/20$727
This FlightHub deal was found by Cheapflights users on 2/19. 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.
mié. 4/23:45 pmSEA - LIS
1 stop21h 35mIcelandair
jue. 4/1710:20 pmLIS - SEA
1 stop27h 30mIcelandair
Deal found 2/19$744

Find flights from Seattle to Portugal within your budget

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 febrero 20, 2025.

Fly from

Seattle

Fly to

Portugal

Route

Depart

Return

Price

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 4/1

6:05 am-11:25 am

2 stops21h 20m

Porto

mié. 4/9

6:15 am-4:59 pm

1 stop18h 44m

$615

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 4/1

12:20 pm-9:45 am

1 stop13h 25m

Porto

mar. 4/8

6:00 am-12:25 pm

1 stop14h 25m

$622

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 3/4

2:10 pm-10:30 am

1 stop36h 20m

Porto

mié. 3/12

4:10 pm-12:40 pm

1 stop27h 30m

$631

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 4/1

2:15 pm-3:45 pm

1 stop17h 30m

Porto

mié. 4/9

6:15 am-4:59 pm

1 stop18h 44m

$632

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

lun. 3/17

1:35 pm-10:50 am

1 stop14h 15m

Porto

mar. 4/1

11:25 am-4:00 pm

1 stop36h 35m

$637

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 4/1

12:45 pm-11:25 am

2 stops38h 40m

Porto

mié. 4/9

8:40 am-9:15 pm

2 stops20h 35m

$651

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 3/18

1:25 pm-5:40 pm

2 stops21h 15m

Porto

mié. 4/2

8:15 am-11:07 pm

2 stops22h 52m

$668

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

lun. 3/31

8:20 pm-11:10 pm

1 stop18h 50m

Lisbon Humberto Delgado

lun. 4/14

11:05 am-11:09 pm

2 stops20h 04m

$708

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

dom. 3/23

10:35 am-11:45 pm

3 stops30h 10m

Lisbon Humberto Delgado

lun. 3/31

7:00 pm-9:26 pm

2 stops34h 26m

$713

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

mar. 4/22

1:30 pm-2:25 pm

1 stop16h 55m

Lisbon Humberto Delgado

mar. 4/29

6:45 pm-11:35 am

1 stop24h 50m

$714

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 54 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.

Travel insights for flights from Seattle to Portugal

Get recent, data-driven insights about flights from Seattle to Portugal including ideal travel times, pricing trends, and more.

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 $1,234). 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 febrero 20, 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 febrero 20, 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
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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
8,220 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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
1,333 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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
1,568 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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
8,766 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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.

Turkish Airlines
7.3
Good
3,832 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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 $404. Users have also found prices from $499 and $510 on KLM and United Airlines, 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 - Funchal Madeira 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 $1,234). 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.

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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 febrero 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$543Average$700FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$600Average$1,157FlexibilityNo cancel feeOn-time69%
Aer LingusCheapest$606Average$968FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$619Average$954FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$621Average$1,005FlexibilityNo cancel feeOn-time71%
LufthansaCheapest$632Average$1,226FlexibilityNo cancel feeOn-time76%
KLMCheapest$649Average$1,000FlexibilityNo cancel feeOn-time75%
Scandinavian AirlinesCheapest$652Average$843FlexibilityNo cancel feeOn-time77%
DeltaCheapest$674Average$1,132FlexibilityNo cancel feeOn-timeN/A
Air FranceCheapest$700Average$1,082FlexibilityNo cancel feeOn-time77%
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