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$255+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LIS
feb. 28 — mar. 71
sáb. 2/28
sáb. 3/7
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 enero 29, 2026.

This Mytrip deal was found by Cheapflights users on 1/27. 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.
mar. 2/248:00 am
SEA
-
OPO
2 stops26h 30m
Multiple Airlines
mar. 3/31:45 pm
OPO
-
SEA
1 stop31h 35m
Multiple Airlines
Deal found 1/27$478
This Travelocity deal was found by Cheapflights users on 1/28. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/246:44 am
SEA
-
OPO
2 stops16h 56m
Iberia
mar. 3/38:20 am
OPO
-
SEA
2 stops22h 44m
Iberia
Deal found 1/28$481
This KLM deal was found by Cheapflights users on 1/28. 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. 3/12:10 pm
SEA
-
OPO
1 stop36h 20m
Multiple Airlines
mar. 3/109:55 am
OPO
-
SEA
1 stop33h 40m
Multiple Airlines
Deal found 1/28$482
This Delta deal was found by Cheapflights users on 1/28. 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. 2/248:00 am
SEA
-
OPO
2 stops18h 30m
Delta
mar. 3/35:00 am
OPO
-
SEA
1 stop14h 35m
Delta
Deal found 1/28$484
This United Airlines deal was found by Cheapflights users on 1/28. 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.
dom. 3/18:17 am
SEA
-
LIS
1 stop17h 58m
United Airlines
mar. 3/175:00 am
LIS
-
SEA
1 stop15h 10m
United Airlines
Deal found 1/28$484
This KLM deal was found by Cheapflights users on 1/28. 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. 3/154:05 pm
SEA
-
FAO
1 stop19h 20m
KLM
dom. 3/226:50 pm
FAO
-
SEA
1 stop24h 45m
KLM
Deal found 1/28$485
This KLM deal was found by Cheapflights users on 1/26. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/243:05 pm
SEA
-
OPO
1 stop23h 20m
KLM
mar. 3/311:15 am
OPO
-
SEA
1 stop32h 20m
KLM
Deal found 1/26$485
This Delta deal was found by Cheapflights users on 1/28. 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. 3/107:00 am
PDX
-
OPO
2 stops20h 30m
Delta
mar. 3/1711:15 am
OPO
-
PDX
1 stop32h 10m
Delta
Deal found 1/28$485
This FlightHub deal was found by Cheapflights users on 1/27. 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.
lun. 4/203:40 pm
SEA
-
LIS
2 stops33h 40m
Multiple Airlines
mar. 4/285:05 am
LIS
-
SEA
1 stop15h 15m
Multiple Airlines
Deal found 1/27$485
This United Airlines deal was found by Cheapflights users on 1/28. 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. 11/178:00 am
SEA
-
LIS
1 stop18h 15m
United Airlines
vie. 11/275:00 am
LIS
-
SEA
1 stop15h 10m
United Airlines
Deal found 1/28$486
This United Airlines deal was found by Cheapflights users on 1/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/249:00 am
SEA
-
OPO
2 stops16h 30m
United Airlines
mar. 3/312:30 pm
OPO
-
SEA
2 stops20h 29m
United Airlines
Deal found 1/26$487
This Delta deal was found by Cheapflights users on 1/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 4/197:20 am
SEA
-
LIS
1 stop16h 40m
Delta
mié. 4/295:00 am
LIS
-
SEA
1 stop14h 45m
Delta
Deal found 1/27$487

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 enero 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$478
(Mytrip)

One-way from

$255
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$504
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. 24% potential increase in price ($274 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 enero 29, 2026.
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

dom. 3/1

2:10 pm-10:30 am

1 stop36h 20m

Porto

mar. 3/10

9:55 am-12:35 pm

1 stop33h 40m

$482

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

8:00 am-10:30 am

2 stops18h 30m

Porto

mar. 3/3

5:00 am-11:35 am

1 stop14h 35m

$484

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

dom. 3/15

4:05 pm-6:25 pm

1 stop19h 20m

Faro

dom. 3/22

6:50 pm-12:35 pm

1 stop24h 45m

$485

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

3:05 pm-10:25 pm

1 stop23h 20m

Porto

mar. 3/3

11:15 am-11:35 am

1 stop32h 20m

$485

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

jue. 2/26

3:05 pm-3:25 pm

1 stop16h 20m

Porto

mié. 3/4

5:00 am-11:35 am

1 stop14h 35m

$486

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar. 2/24

9:00 am-9:30 am

2 stops16h 30m

Porto

mar. 3/3

12:30 pm-12:59 am

2 stops20h 29m

$487

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

mar. 4/14

6:40 pm-5:50 pm

1 stop15h 10m

Lisbon Humberto Delgado

jue. 4/23

5:00 am-11:45 am

1 stop14h 45m

$487

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

mié. 4/22

1:30 pm-7:30 pm

2 stops22h 00m

Faro

lun. 4/27

9:45 pm-11:45 am

1 stop22h 00m

$488

PortlandPorto

PDX - OPO

PDXOPO

Portland

mar. 3/3

6:00 am-10:30 am

2 stops20h 30m

Porto

mar. 3/10

4:10 pm-12:25 pm

1 stop27h 15m

$490

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

mié. 4/22

11:45 am-2:55 pm

2 stops19h 10m

Lisbon Humberto Delgado

mié. 4/29

5:00 am-4:30 pm

1 stop19h 30m

$491

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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 $869). 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.

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 16h 30m. Fly via Delta, KLM, or United Airlines 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 $286. Users have also found prices from $317 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 $869). 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 enero 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$348Average$530FlexibilityNo cancel feeOn-time76%
KLMCheapest$481Average$930FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$486Average$852FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$488Average$1,033FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$498Average$1,153FlexibilityNo cancel feeOn-time69%
DeltaCheapest$499Average$885FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$543Average$1,056FlexibilityNo cancel feeOn-time67%
Air FranceCheapest$546Average$950FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$558Average$1,126FlexibilityNo cancel feeOn-time71%
SWISSCheapest$562Average$1,002FlexibilityNo cancel feeOn-time79%

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