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$270+ Cheap flights from Washington 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 1/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
janv. 14 — janv. 211
mer. 1/14
mer. 1/21
1 adult, Economy
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Cheap flight deals from Washington to Portugal

Cheapest flights from Washington to Portugal
Explore the most affordable flight options available from Washington to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on décembre 15, 2025.

This Air Canada deal was found by Cheapflights users on 12/15. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 12/267:00 pmPDX - LIS
2 stops29h 55mMultiple Airlines
mar. 1/276:10 amLIS - PDX
2 stops35h 05mMultiple Airlines
Deal found 12/15$602
This FlightHub deal was found by Cheapflights users on 12/13. 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.
ven. 12/263:40 pmSEA - LIS
2 stops33h 15mMultiple Airlines
sam. 1/247:00 pmLIS - SEA
1 stop26h 20mMultiple Airlines
Deal found 12/13$604
This oojo deal was found by Cheapflights users on 12/15. 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.
mer. 12/312:35 pmSEA - LIS
1 stop21h 45mIcelandair
dim. 1/119:20 pmLIS - SEA
1 stop27h 40mIcelandair
Deal found 12/15$631
This United Airlines deal was found by Cheapflights users on 12/13. 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.
dim. 12/148:10 amSEA - LIS
1 stop18h 05mUnited Airlines
dim. 12/2110:50 amLIS - SEA
1 stop19h 26mUnited Airlines
Deal found 12/13$637
This Finnair deal was found by Cheapflights users on 12/13. 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.
mer. 12/317:00 amPDX - LIS
2 stops15h 55mMultiple Airlines
dim. 1/1111:05 amLIS - PDX
2 stops19h 06mMultiple Airlines
Deal found 12/13$647
This American Airlines deal was found by Cheapflights users on 12/13. 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.
mer. 12/316:00 amSEA - LIS
2 stops16h 55mMultiple Airlines
dim. 1/1111:05 amLIS - SEA
1 stop19h 24mMultiple Airlines
Deal found 12/13$655
This United Airlines deal was found by Cheapflights users on 12/13. 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.
sam. 12/133:40 pmSEA - LIS
2 stops32h 30mUnited Airlines
dim. 12/2110:50 amLIS - SEA
2 stops22h 09mUnited Airlines
Deal found 12/13$660
This Delta deal was found by Cheapflights users on 12/15. 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.
mer. 12/319:35 amSEA - LIS
2 stops21h 35mDelta
dim. 1/115:00 amLIS - SEA
1 stop14h 50mDelta
Deal found 12/15$680
This KLM deal was found by Cheapflights users on 12/14. 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.
lun. 12/291:25 pmPDX - OPO
1 stop18h 00mKLM
jeu. 1/294:10 pmOPO - PDX
1 stop27h 15mKLM
Deal found 12/14$684
This KLM deal was found by Cheapflights users on 12/14. 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.
lun. 12/2912:29 pmPDX - OPO
2 stops18h 56mKLM
ven. 1/305:00 amOPO - PDX
1 stop14h 25mKLM
Deal found 12/14$689
This American Airlines deal was found by Cheapflights users on 12/15. 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.
mar. 12/168:34 amSEA - LIS
2 stops16h 31mMultiple Airlines
mer. 12/2411:05 amLIS - SEA
2 stops19h 13mMultiple Airlines
Deal found 12/15$691
This Delta deal was found by Cheapflights users on 12/14. 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.
mar. 12/306:50 amPDX - OPO
2 stops19h 40mDelta
jeu. 1/225:00 amOPO - PDX
2 stops21h 50mDelta
Deal found 12/14$693

Find flight deals from Washington to Portugal

Keep the following information in mind while searching for Washington to Portugal flight deals. Data was last updated décembre 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$443
(oojo)

One-way from

$270
(Cheapflightsfares)

Popular in

June

Cheapest in

January

Average price

$1,107
Provider with most accurate pricing for Seattle/Tacoma Intl-Lisbon Humberto Delgado flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Lisbon Humberto Delgado flights.
Search Deals
From Washington to Portugal
Search Deals
One-way flight from Washington to Portugal
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($250 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington 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 décembre 15, 2025.
Use the filters below to find and compare flights from Washington to Portugal that are best for you.

Fly from

Washington

Fly to

Portugal

Route

Depart

Return

Price

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

jeu. 1/29

2:00 pm-2:45 pm

1 stop16h 45m

Porto

jeu. 2/5

2:05 pm-1:20 pm

1 stop31h 15m

$460

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 1/27

1:40 pm-10:30 am

1 stop12h 50m

Porto

mar. 2/3

5:00 am-11:40 am

1 stop14h 40m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 1/13

1:40 pm-10:30 am

1 stop12h 50m

Porto

lun. 2/2

5:00 am-11:40 am

1 stop14h 40m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/3

1:40 pm-10:30 am

1 stop12h 50m

Porto

mar. 2/10

5:00 am-11:40 am

1 stop14h 40m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

lun. 1/12

2:10 pm-10:30 am

1 stop36h 20m

Porto

mar. 1/20

9:55 am-11:50 am

1 stop33h 55m

$480

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

mar. 2/10

3:05 pm-9:35 am

1 stop34h 30m

Faro

dim. 3/1

6:50 pm-11:35 am

1 stop24h 45m

$482

PortlandPorto

PDX - OPO

PDXOPO

Portland

mer. 1/14

6:00 am-10:30 am

2 stops20h 30m

Porto

mer. 1/21

5:00 am-11:25 am

1 stop14h 25m

$483

PortlandPorto

PDX - OPO

PDXOPO

Portland

mer. 2/18

7:00 am-10:30 am

2 stops19h 30m

Porto

sam. 3/7

11:15 am-11:25 am

1 stop32h 10m

$483

PortlandPorto

PDX - OPO

PDXOPO

Portland

dim. 3/15

2:25 pm-10:30 am

1 stop13h 05m

Porto

lun. 3/23

5:00 am-12:25 pm

1 stop14h 25m

$484

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

lun. 2/9

7:10 am-8:00 am

1 stop16h 50m

Lisbon Humberto Delgado

lun. 2/23

11:25 am-11:40 am

1 stop32h 15m

$486

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Showing 1-10 of 60 results
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Best time to book a flight from Washington to Portugal

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

What is the cheapest month to book a flight from State of Washington to Portugal?

Currently, January is the cheapest month in which you can book a flight from State of Washington to Portugal (average of $348). Flying from State of Washington to Portugal in June is currently the most expensive (average of $975). 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 WA to PT?

Find hourly flight availability from Washington 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 décembre 15, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 12% on flights from State of Washington to Portugal by exploring options for tickets in the afternoon.

What is the cheapest day to fly from State of Washington to Portugal?

Use this chart to determine the cheapest time to fly round-trip from Washington to Portugal. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their State of Washington to Portugal flight should consider departing on Tuesday at noon when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from Washington to Portugal. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from State of Washington to Portugal?

    There are many flights that can get you from State of Washington to Portugal in 12h 50m. Fly via Lufthansa, KLM, or Delta to get the fastest option. The distance from State of Washington to Portugal is about 5083 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from State of Washington to Portugal one-way?

    For one-way options, check prices for Icelandair. According to our data, you can fly for as low as $322. Users have also found prices from $350 and $360 on British Airways and TAP AIR PORTUGAL, respectively.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington 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 State of Washington to Portugal?

    Currently, January is the cheapest month in which you can book a flight from State of Washington to Portugal (average of $348). Flying from State of Washington to Portugal in June is currently the most expensive (average of $975). 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 Washington 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 Washington to Portugal

Discover the top 10 airlines that operate flights from Washington 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 décembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$355Average$554FlexibilityNo cancel feeOn-time76%
KLMCheapest$481Average$996FlexibilityNo cancel feeOn-time75%
DeltaCheapest$505Average$973FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$508Average$1,007FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$513Average$1,198FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$516Average$1,004FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$543Average$1,004FlexibilityNo cancel feeOn-time67%
Air FranceCheapest$553Average$942FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$558Average$1,030FlexibilityNo cancel feeOn-time71%
SWISSCheapest$562Average$940FlexibilityNo cancel feeOn-time79%

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