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 $357. Users have also found prices from $408 and $417 on Lufthansa and Scandinavian Airlines, 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 58 days before your planned departure. Booking around this time can save you about 28% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $750 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 $978. You can even find prices in January for less than $978, 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 35%.

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.

$706+ Flights from Washington to Portugal

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Cheap flight deals from Washington to Portugal

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$750 (United Airlines)
One-way from	$326 (Kiwi.com)
Popular in	June
Cheapest in	January
Average price	$909

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 ($195 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 April 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 April 22, 2025.

Wed 9/34:00 pmSEA - LIS

2 stops22h 10mMultiple Airlines

Tue 9/166:20 pmLIS - SEA

2 stops27h 40mMultiple Airlines

Deal found 4/21

$701

Thu 11/205:45 amSEA - LIS

2 stops19h 35mAir Canada

Sat 11/295:00 amLIS - SEA

2 stops24h 55mAir Canada

Deal found 4/20

$709

Sun 9/284:20 pmSEA - LIS

1 stop20h 20mScandinavian Airlines

Wed 10/157:15 amLIS - SEA

1 stop14h 45mScandinavian Airlines

Deal found 4/20

$715

Thu 12/45:00 amGEG - LIS

2 stops20h 20mUnited Airlines

Mon 12/155:00 amLIS - GEG

2 stops61h 55mUnited Airlines

Deal found 4/20

$725

Thu 11/2012:50 pmSEA - LIS

1 stop13h 25mUnited Airlines

Sat 12/611:55 amLIS - SEA

1 stop16h 15mUnited Airlines

Deal found 4/20

$731

Wed 8/67:00 pmSEA - LIS

1 stop18h 20mIcelandair

Thu 8/1410:20 pmLIS - SEA

1 stop21h 05mIcelandair

Deal found 4/21

$734

Mon 12/82:00 pmSEA - OPO

1 stop24h 25mLufthansa

Mon 12/291:45 pmOPO - SEA

1 stop31h 35mLufthansa

Deal found 4/22

$744

Sat 11/222:00 pmSEA - LIS

1 stop17h 05mLufthansa

Sat 12/65:00 amLIS - SEA

1 stop15h 10mLufthansa

Deal found 4/20

$748

Mon 10/68:15 amPDX - LIS

1 stop18h 15mUnited Airlines

Fri 10/1711:25 amLIS - PDX

2 stops21h 19mUnited Airlines

Deal found 4/21

$750

Wed 9/1710:00 amSEA - OPO

2 stops15h 25mMultiple Airlines

Tue 9/236:00 amOPO - SEA

2 stops35h 21mMultiple Airlines

Deal found 4/22

$753

Mon 5/52:14 pmPDX - LIS

2 stops23h 36mMultiple Airlines

Tue 5/135:05 amLIS - PDX

2 stops17h 35mMultiple Airlines

Deal found 4/21

$754

Tue 6/37:35 pmSEA - FAO

1 stop17h 55mMultiple Airlines

Tue 6/106:20 amFAO - SEA

1 stop19h 30mMultiple Airlines

Deal found 4/20

$756

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 April 22, 2025.

Tue 10/78:15 amPDX - LIS

1 stop18h 15mUnited Airlines

Fri 10/1711:25 amLIS - PDX

2 stops19h 12mUnited Airlines

Deal found 4/21

$750

Wed 9/1710:00 amSEA - OPO

2 stops15h 25mMultiple Airlines

Tue 9/236:00 amOPO - SEA

2 stops35h 21mMultiple Airlines

Deal found 4/22

$753

Mon 9/227:00 amPDX - LIS

1 stop17h 00mKLM

Thu 10/210:25 amLIS - PDX

1 stop32h 40mKLM

Deal found 4/21

$757

Sat 10/113:20 pmPDX - LIS

1 stop22h 00mIcelandair

Thu 10/1610:20 pmLIS - PDX

1 stop27h 35mIcelandair

Deal found 4/21

$760

Fri 8/291:38 pmPDX - LIS

2 stops35h 22mScandinavian Airlines

Wed 9/107:15 amLIS - PDX

2 stops23h 05mScandinavian Airlines

Deal found 4/21

$762

Sun 10/57:00 amPDX - LIS

1 stop17h 00mDelta

Wed 10/155:00 amLIS - PDX

1 stop14h 20mDelta

Deal found 4/21

$763

Tue 5/131:55 pmPDX - LIS

2 stops20h 00mBritish Airways

Tue 5/207:15 amLIS - PDX

1 stop18h 20mBritish Airways

Deal found 4/21

$769

Sun 10/510:00 amPDX - LIS

2 stops15h 20mLufthansa

Mon 10/204:20 pmLIS - PDX

2 stops34h 12mLufthansa

Deal found 4/21

$771

Tue 6/37:35 pmSEA - LIS

1 stop18h 00mAer Lingus

Tue 6/1010:15 pmLIS - SEA

1 stop27h 35mAer Lingus

Deal found 4/21

$773

Tue 9/167:40 pmPDX - LIS

2 stops31h 30mAir Canada

Mon 9/2212:15 pmLIS - PDX

2 stops38h 31mAir Canada

Deal found 4/21

$785

Thu 9/187:10 pmSEA - OPO

1 stop30h 35mTurkish Airlines

Wed 9/2410:50 amOPO - SEA

1 stop38h 25mTurkish Airlines

Deal found 4/22

$808

Mon 5/122:40 pmSEA - LIS

2 stops24h 40mSWISS

Mon 5/193:35 pmLIS - SEA

2 stops34h 58mSWISS

Deal found 4/21

$824

Last-minute flights from Washington to Portugal
Discover last-minute flight deals from Washington to Portugal. Data last updated April 22, 2025 and is based on user searches.

Sat 4/263:45 pmSEA - LIS

1 stop21h 35mIcelandair

Thu 5/810:20 pmLIS - SEA

1 stop30h 20mIcelandair

Deal found 4/22

$964

Mon 4/287:00 pmSEA - FAO

2 stops16h 15mMultiple Airlines

Fri 5/96:20 amFAO - SEA

3 stops25h 50mMultiple Airlines

Deal found 4/20

$816

Mon 4/286:45 pmSEA - FAO

1 stop16h 15mAer Lingus

Fri 5/911:40 amFAO - SEA

2 stops19h 29mAer Lingus

Deal found 4/21

$964

Thu 5/110:21 amPDX - FAO

2 stops20h 14mMultiple Airlines

Sat 5/106:40 pmFAO - PDX

2 stops32h 05mMultiple Airlines

Deal found 4/21

$977

Thu 5/17:01 pmPDX - OPO

3 stops35h 44mMultiple Airlines

Sun 5/114:55 pmOPO - PDX

3 stops38h 00mMultiple Airlines

Deal found 4/20

$998

Fri 5/26:15 amPDX - FAO

2 stops24h 20mAir Canada

Mon 5/123:55 pmFAO - PDX

2 stops49h 35mAir Canada

Deal found 4/21

$989

Sun 5/46:50 pmSEA - LIS

1 stop19h 00mLufthansa

Wed 5/216:15 amLIS - SEA

1 stop18h 44mLufthansa

Deal found 4/21

$823

Sun 5/47:10 amSEA - LIS

2 stops20h 05mDelta

Wed 5/215:00 amLIS - SEA

2 stops19h 44mDelta

Deal found 4/21

$873

Mon 5/53:45 pmSEA - LIS

3 stops32h 45mMultiple Airlines

Sat 5/109:10 amLIS - SEA

2 stops35h 48mMultiple Airlines

Deal found 4/21

$789

Mon 5/52:14 pmPDX - LIS

2 stops23h 36mMultiple Airlines

Tue 5/135:05 amLIS - PDX

2 stops17h 35mMultiple Airlines

Deal found 4/21

$754

Mon 5/51:15 pmPDX - LIS

1 stop25h 35mKLM

Tue 5/137:30 pmLIS - PDX

1 stop23h 50mKLM

Deal found 4/21

$776

Tue 5/67:00 amSEA - LIS

2 stops19h 30mUnited Airlines

Tue 5/1311:25 amLIS - SEA

2 stops36h 33mUnited Airlines

Deal found 4/20

$795

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 April 22, 2025.

Tue 8/510:30 amPDX - LIS

2 stops22h 05mMultiple Airlines

Deal found 4/20

$326

Thu 10/97:00 pmSEA - LIS

2 stops19h 05mMultiple Airlines

Deal found 4/21

$354

Wed 7/3011:30 pmSEA - LIS

1 stop13h 50mIcelandair

Deal found 4/22

$357

Mon 5/127:00 pmSEA - FAO

2 stops29h 50mMultiple Airlines

Deal found 4/22

$369

Fri 5/301:50 pmSEA - OPO

3 stops59h 00mMultiple Airlines

Deal found 4/21

$404

Wed 10/1510:00 amSEA - LIS

2 stops15h 20mLufthansa

Deal found 4/21

$408

Tue 5/131:06 pmPDX - OPO

2 stops24h 54mMultiple Airlines

Deal found 4/20

$412

Wed 8/273:20 pmPDX - LIS

1 stop22h 00mIcelandair

Deal found 4/21

$416

Mon 8/184:00 pmSEA - LIS

1 stop20h 40mScandinavian Airlines

Deal found 4/21

$417

Thu 7/106:49 pmGEG - LIS

2 stops42h 31mMultiple Airlines

Deal found 4/20

$456

Wed 10/157:25 pmPDX - LIS

1 stop19h 45mBritish Airways

Deal found 4/22

$481

Wed 10/156:15 amPDX - LIS

2 stops19h 05mAir Canada

Deal found 4/22

$483

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

Wed 9/3

4:00 pm-10:10 pm

2 stops22h 10m

Lisbon Humberto Delgado

Tue 9/16

6:20 pm-2:00 pm

2 stops27h 40m

$701

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 10/7

7:20 am-9:20 am

1 stop18h 00m

Lisbon Humberto Delgado

Tue 11/4

11:00 am-9:50 am

2 stops30h 50m

$714

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 9/28

4:20 pm-8:40 pm

1 stop20h 20m

Lisbon Humberto Delgado

Wed 10/15

7:15 am-2:00 pm

1 stop14h 45m

$715

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 8/6

11:30 pm-9:20 pm

1 stop13h 50m

Lisbon Humberto Delgado

Sun 8/17

10:20 pm-11:25 am

1 stop21h 05m

$734

PortlandLisbon

PDX - LIS

PDXLIS

Portland

Mon 10/6

8:15 am-10:30 am

1 stop18h 15m

Lisbon Humberto Delgado

Fri 10/17

11:25 am-12:44 am

2 stops21h 19m

$750

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 9/17

10:00 am-9:25 am

2 stops15h 25m

Porto

Tue 9/23

6:00 am-9:21 am

2 stops35h 21m

$753

PortlandLisbon

PDX - LIS

PDXLIS

Portland

Mon 5/5

2:14 pm-9:50 pm

2 stops23h 36m

Lisbon Humberto Delgado

Tue 5/13

5:05 am-2:40 pm

2 stops17h 35m

$754

PortlandLisbon

PDX - LIS

PDXLIS

Portland

Mon 9/22

7:00 am-8:00 am

1 stop17h 00m

Lisbon Humberto Delgado

Thu 10/2

10:25 am-11:05 am

1 stop32h 40m

$757

PortlandLisbon

PDX - LIS

PDXLIS

Portland

Sat 10/11

3:20 pm-9:20 pm

1 stop22h 00m

Lisbon Humberto Delgado

Thu 10/16

10:20 pm-5:55 pm

1 stop27h 35m

$760

PortlandLisbon

PDX - LIS

PDXLIS

Portland

Fri 8/29

1:38 pm-9:00 am

2 stops35h 22m

Lisbon Humberto Delgado

Wed 9/10

7:15 am-10:20 pm

2 stops23h 05m

$762

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/20

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 $1,203). 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 SWISS 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

7,920 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

7,920 reviews

Delta

8.0

Very good

7,920 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

1,331 reviews

Delta

8.0

Very good

7,920 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

1,582 reviews

Delta

8.0

Very good

7,920 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

1,441 reviews

Delta

8.0

Very good

7,920 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.

United Airlines

7.4

Good

8,683 reviews

Delta

8.0

Very good

7,920 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 Icelandair. According to our data, you can fly for as low as $357. Users have also found prices from $408 and $417 on Lufthansa and Scandinavian Airlines, 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 $1,203). 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$543	Average$670	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$581	Average$1,031	FlexibilityNo cancel fee	On-time70%
Lufthansa	Cheapest$632	Average$1,090	FlexibilityNo cancel fee	On-time76%
Delta	Cheapest$636	Average$1,104	FlexibilityNo cancel fee	On-timeN/A
Aer Lingus	Cheapest$639	Average$963	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$643	Average$1,014	FlexibilityNo cancel fee	On-time71%
Scandinavian Airlines	Cheapest$652	Average$821	FlexibilityNo cancel fee	On-time77%
United Airlines	Cheapest$696	Average$1,157	FlexibilityNo cancel fee	On-time69%
Air Canada	Cheapest$697	Average$1,044	FlexibilityNo cancel fee	On-time67%
Air France	Cheapest$705	Average$1,117	FlexibilityNo cancel fee	On-time77%

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$326+ 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 8/5. 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 April 22, 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 April 22, 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 April 22, 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 April 22, 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 SWISS 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 April 22, 2025.