What are the cheapest airlines to fly from State of Washington 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 $375. Users have also found prices from $487 and $590 on Scandinavian Airlines and KLM, respectively.

How far in advance should I book a flight from State of Washington to Portugal?

To save on the cost of your flight from State of Washington to Portugal, book at least 16 days before your planned departure. Booking around this time can save you about 24% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $757 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $1,115.

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

The best pricing can be found in the month of January. Prices to Portugal from State of Washington average $984. You can even find prices in January for less than $984, as users have found deals to Portugal from as low as $600. The month of June appears to be one of the more expensive times to travel to Portugal from State of Washington. Flying in the targeted month can save you up to 34%.

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.

$780+ Flights from Washington to Portugal

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Cheap flight deals from Washington to Portugal

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$699 (Kiwi.com)
One-way from	$328 (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 Washington to Portugal

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One-way flight from Washington to Portugal

Search Deals

Highest demand for flights based on searches. 16% potential increase in price ($199 potential increase over avg. RT price).

Search Deals

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 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 March 31, 2025.

Tue 11/410:35 amSEA - OPO

2 stops17h 05mMultiple Airlines

Tue 11/117:30 pmOPO - SEA

2 stops34h 59mMultiple Airlines

Deal found 3/31

$648

Tue 11/42:00 pmSEA - OPO

1 stop17h 15mUnited Airlines

Tue 11/1112:30 pmOPO - SEA

1 stop31h 40mUnited Airlines

Deal found 3/31

$665

Sat 11/16:59 pmPDX - LIS

2 stops32h 16mUnited Airlines

Thu 11/1311:00 amLIS - PDX

2 stops38h 38mUnited Airlines

Deal found 3/31

$674

Mon 10/2710:56 pmPDX - LIS

1 stop26h 14mMultiple Airlines

Sun 11/911:00 amLIS - PDX

2 stops35h 44mMultiple Airlines

Deal found 3/30

$677

Sat 11/17:05 pmPDX - LIS

2 stops37h 00mAir Canada

Thu 11/135:00 amLIS - PDX

2 stops21h 24mAir Canada

Deal found 3/30

$680

Sat 10/257:15 pmSEA - LIS

2 stops31h 05mMultiple Airlines

Sat 11/12:10 pmLIS - SEA

1 stop31h 10mMultiple Airlines

Deal found 3/30

$696

Sun 10/196:50 pmSEA - OPO

1 stop20h 30mLufthansa

Sat 11/11:45 pmOPO - SEA

1 stop31h 35mLufthansa

Deal found 3/29

$701

Mon 10/207:20 amSEA - LIS

1 stop18h 00mAir Canada

Thu 10/305:00 amLIS - SEA

2 stops20h 25mAir Canada

Deal found 3/30

$704

Sun 10/197:20 amSEA - LIS

1 stop18h 00mUnited Airlines

Wed 10/2911:00 amLIS - SEA

2 stops38h 27mUnited Airlines

Deal found 3/31

$705

Sat 4/267:00 pmSEA - LIS

1 stop18h 20mIcelandair

Sun 5/410:25 pmLIS - SEA

1 stop27h 25mIcelandair

Deal found 3/31

$708

Tue 10/142:05 pmGEG - LIS

2 stops35h 15mUnited Airlines

Tue 10/2111:25 amLIS - GEG

2 stops35h 54mUnited Airlines

Deal found 3/29

$709

Mon 10/203:25 pmPDX - LIS

2 stops33h 55mLufthansa

Tue 10/2811:00 amLIS - PDX

2 stops38h 24mLufthansa

Deal found 3/31

$712

Best flights from Washington to Portugal
Discover carefully curated flight deals from Washington to Portugal that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 31, 2025.

Mon 5/511:38 amSEA - LIS

1 stop14h 32mMultiple Airlines

Sun 5/185:55 amLIS - SEA

2 stops39h 03mMultiple Airlines

Deal found 3/30

$699

Sat 4/267:00 pmSEA - LIS

1 stop18h 20mIcelandair

Sun 5/410:25 pmLIS - SEA

1 stop27h 25mIcelandair

Deal found 3/31

$708

Wed 9/176:50 pmSEA - OPO

1 stop20h 30mLufthansa

Wed 10/16:15 amOPO - SEA

1 stop18h 44mLufthansa

Deal found 3/30

$768

Fri 8/294:00 pmSEA - FAO

1 stop17h 55mScandinavian Airlines

Sat 9/67:35 pmFAO - SEA

2 stops50h 15mScandinavian Airlines

Deal found 3/31

$776

Tue 8/57:34 pmSEA - OPO

3 stops29h 46mUnited Airlines

Tue 8/1912:50 pmOPO - SEA

2 stops30h 41mUnited Airlines

Deal found 3/30

$777

Tue 8/127:40 pmPDX - LIS

2 stops29h 40mAir Canada

Tue 8/2611:25 amLIS - PDX

2 stops39h 06mAir Canada

Deal found 3/30

$784

Sun 4/277:10 pmSEA - LIS

1 stop30h 45mTurkish Airlines

Tue 5/610:55 amLIS - SEA

1 stop38h 20mTurkish Airlines

Deal found 3/30

$790

Tue 4/157:00 amPDX - LIS

1 stop17h 00mDelta

Tue 4/2211:40 amLIS - PDX

1 stop31h 40mDelta

Deal found 3/31

$806

Wed 5/142:40 pmSEA - FAO

2 stops42h 55mSWISS

Wed 5/216:55 pmFAO - SEA

2 stops31h 38mSWISS

Deal found 3/30

$812

Tue 4/291:55 pmPDX - OPO

2 stops17h 40mKLM

Tue 5/66:50 pmOPO - PDX

1 stop24h 30mKLM

Deal found 3/30

$820

Mon 5/57:25 pmPDX - LIS

1 stop14h 30mBritish Airways

Tue 5/1311:00 amLIS - PDX

1 stop14h 35mBritish Airways

Deal found 3/30

$827

Wed 8/207:25 pmPDX - LIS

1 stop19h 45mAmerican Airlines

Sun 8/3111:05 amLIS - PDX

1 stop18h 25mAmerican Airlines

Deal found 3/31

$870

Last-minute flights from Washington to Portugal
Discover last-minute flight deals from Washington to Portugal. Data last updated March 31, 2025 and is based on user searches.

Mon 3/317:00 amPDX - LIS

2 stops20h 10mMultiple Airlines

Mon 4/712:35 pmLIS - PDX

2 stops42h 01mMultiple Airlines

Deal found 3/30

$808

Sun 4/611:55 pmSEA - FNC

2 stops29h 10mMultiple Airlines

Sat 4/125:25 pmFNC - SEA

1 stop31h 34mMultiple Airlines

Deal found 3/30

$1,579

Mon 4/711:55 pmSEA - PDL

2 stops29h 50mMultiple Airlines

Wed 4/235:30 pmPDL - SEA

1 stop23h 57mMultiple Airlines

Deal found 3/31

$895

Tue 4/811:15 amPDX - LIS

3 stops25h 15mMultiple Airlines

Tue 4/2910:35 amLIS - PDX

2 stops35h 02mMultiple Airlines

Deal found 3/30

$965

Wed 4/93:15 pmSEA - LIS

2 stops23h 35mMultiple Airlines

Sun 4/279:10 amLIS - SEA

3 stops36h 15mMultiple Airlines

Deal found 3/30

$953

Wed 4/92:15 pmSEA - FAO

1 stop16h 20mLufthansa

Sun 4/203:25 pmFAO - SEA

1 stop29h 00mLufthansa

Deal found 3/30

$1,225

Wed 4/95:45 amSEA - FAO

2 stops24h 50mMultiple Airlines

Sun 4/203:25 pmFAO - SEA

1 stop29h 00mMultiple Airlines

Deal found 3/30

$1,253

Wed 4/99:10 amSEA - FAO

2 stops21h 25mUnited Airlines

Sun 4/203:25 pmFAO - SEA

2 stops39h 18mUnited Airlines

Deal found 3/30

$1,268

Wed 4/93:45 pmSEA - LIS

1 stop21h 35mIcelandair

Sun 4/2710:25 pmLIS - SEA

1 stop30h 15mIcelandair

Deal found 3/30

$1,301

Wed 4/97:10 pmSEA - LIS

1 stop30h 35mTurkish Airlines

Sat 4/1910:55 amLIS - SEA

1 stop38h 20mTurkish Airlines

Deal found 3/30

$1,491

Thu 4/1011:59 pmSEA - LIS

2 stops26h 46mAer Lingus

Sat 4/1911:25 amLIS - SEA

2 stops19h 44mAer Lingus

Deal found 3/30

$1,867

Thu 4/107:10 pmSEA - OPO

1 stop30h 35mTurkish Airlines

Sun 4/204:05 pmOPO - SEA

1 stop33h 10mTurkish Airlines

Deal found 3/30

$1,951

One-way flights from Washington to Portugal
Search for one-way flight options from Washington to Portugal. Find affordable one-way fares based on user searches. Data last updated March 31, 2025.

Mon 5/193:45 pmSEA - FAO

3 stops31h 35mMultiple Airlines

Deal found 3/30

$328

Mon 5/193:45 pmSEA - LIS

3 stops41h 10mMultiple Airlines

Deal found 3/30

$332

Fri 8/89:30 pmPDX - LIS

1 stop30h 15mMultiple Airlines

Deal found 3/30

$344

Sat 6/71:45 pmPDX - OPO

2 stops36h 20mMultiple Airlines

Deal found 3/30

$362

Mon 5/511:35 amSEA - LIS

1 stop14h 35mTAP AIR PORTUGAL

Deal found 3/30

$375

Mon 5/191:00 pmPDX - OPO

2 stops38h 00mScandinavian Airlines

Deal found 3/31

$487

Thu 5/16:30 pmPDX - PDL

3 stops35h 20mMultiple Airlines

Deal found 3/30

$493

Fri 5/234:00 pmSEA - LIS

1 stop33h 00mScandinavian Airlines

Deal found 3/30

$527

Fri 5/234:00 pmSEA - FAO

1 stop17h 55mScandinavian Airlines

Deal found 3/30

$563

Mon 5/196:07 pmSEA - FAO

1 stop33h 43mKLM

Deal found 3/30

$590

Mon 9/227:25 pmPDX - LIS

1 stop14h 30mBritish Airways

Deal found 3/31

$597

Tue 8/197:40 pmPDX - OPO

2 stops29h 40mAir Canada

Deal found 3/30

$603

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 5/5

11:38 am-10:10 am

1 stop14h 32m

Lisbon Humberto Delgado

Sun 5/18

5:55 am-12:58 pm

2 stops39h 03m

$699

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sat 4/26

7:00 pm-9:20 pm

1 stop18h 20m

Lisbon Humberto Delgado

Sun 5/4

10:25 pm-5:50 pm

1 stop27h 25m

$708

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Tue 5/13

2:05 pm-11:50 pm

3 stops25h 45m

Faro

Tue 5/20

9:25 pm-8:28 pm

2 stops31h 03m

$730

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 9/19

4:20 pm-9:00 am

1 stop32h 40m

Lisbon Humberto Delgado

Wed 9/24

7:15 am-2:00 pm

1 stop14h 45m

$732

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 9/10

7:10 pm-9:40 am

1 stop30h 30m

Lisbon Humberto Delgado

Fri 9/19

11:10 am-10:35 am

1 stop31h 25m

$771

PortlandLisbon

PDX - LIS

PDXLIS

Portland

Tue 8/12

7:40 pm-9:20 am

2 stops29h 40m

Lisbon Humberto Delgado

Tue 8/26

11:25 am-6:31 pm

2 stops39h 06m

$784

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 9/17

7:20 am-9:20 am

1 stop18h 00m

Lisbon Humberto Delgado

Fri 10/17

11:25 am-1:20 pm

2 stops33h 55m

$784

PortlandLisbon

PDX - LIS

PDXLIS

Portland

Tue 9/16

11:59 pm-9:20 am

2 stops25h 21m

Lisbon Humberto Delgado

Tue 9/30

11:25 am-6:05 pm

2 stops38h 40m

$788

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 9/17

10:00 am-9:20 am

2 stops15h 20m

Lisbon Humberto Delgado

Fri 9/26

5:05 am-10:16 pm

2 stops25h 11m

$789

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 5/12

2:15 pm-3:45 pm

1 stop17h 30m

Porto

Mon 5/19

12:50 pm-6:33 pm

2 stops37h 43m

$800

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/30

Showing 1-10 of 60 results

...

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 $612). Flying from State of Washington 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 WA to PT?

When flying from State of Washington to Portugal, 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 Portugal 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

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 a feel of what it's like to fly with Delta, KLM and Finnair from Washington to Portugal by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,899 reviews

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

7,899 reviews

Delta

8.0

Very good

7,899 reviews

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

7,899 reviews

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

7,899 reviews

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

7,899 reviews

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

1,425 reviews

Delta

8.0

Very good

7,899 reviews

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

What are the cheapest airlines to fly from State of Washington 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 $375. Users have also found prices from $487 and $590 on Scandinavian Airlines and KLM, 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 $612). Flying from State of Washington 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

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from Washington to Portugal

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest$553	Average$684	FlexibilityNo cancel fee	On-time76%
Aer Lingus	Cheapest$606	Average$965	FlexibilityNo cancel fee	On-timeN/A
Lufthansa	Cheapest$632	Average$1,139	FlexibilityNo cancel fee	On-time76%
Delta	Cheapest$636	Average$1,155	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$643	Average$1,028	FlexibilityNo cancel fee	On-time71%
KLM	Cheapest$649	Average$1,004	FlexibilityNo cancel fee	On-time75%
Scandinavian Airlines	Cheapest$652	Average$821	FlexibilityNo cancel fee	On-time77%
British Airways	Cheapest$667	Average$969	FlexibilityNo cancel fee	On-time70%
Air France	Cheapest$705	Average$1,209	FlexibilityNo cancel fee	On-time77%
United Airlines	Cheapest$706	Average$1,168	FlexibilityNo cancel fee	On-time69%

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$328+ 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.

Find cheap flights from Washington to Portugal with Cheapflights

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Cheap flight deals from Washington to Portugal

Keep the following information in mind while searching for Washington to Portugal flight deals. Data was last updated March 31, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Washington to Portugal

Cheapest flights from Washington to PortugalExplore 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 March 31, 2025.

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 March 31, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington to Portugal that are best for you.

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.

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?

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 March 31, 2025.

Rainfall in Portugal by month

Plan your trip to Portugal by taking into account the average rainfall totals by month.

Temperature in Portugal by month

Plan your trip to Portugal by taking into account the average temperature totals by month.

Reviews of airlines servicing Portugal

Get a feel of what it's like to fly with Delta, KLM and Finnair from Washington to Portugal by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

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.

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

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

How can I find direct flights from Washington to Portugal?

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Washington to Portugal

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from Washington to Portugal

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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 March 31, 2025.