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

For one-way options, check prices for Scandinavian Airlines. According to our data, you can fly for as low as $534. Users have also found prices from $566 and $571 on British Airways and Air Canada, 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 $977. You can even find prices in January for less than $977, 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.

$760+ Flights from Washington to Portugal - Compare & Save Big

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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	$784 (Air Canada)
One-way from	$286 (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

Search Deals

One-way flight from Washington to Portugal

Search Deals

Highest demand for flights based on searches. 16% potential increase in price ($194 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 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 30, 2025.

Thu 11/62:00 pmSEA - OPO

1 stop17h 15mMultiple Airlines

Fri 11/146:15 amOPO - SEA

2 stops20h 11mMultiple Airlines

Deal found 4/29

$699

Thu 11/68:20 pmSEA - OPO

2 stops34h 55mAir Canada

Fri 11/146:15 amOPO - SEA

2 stops40h 11mAir Canada

Deal found 4/29

$700

Wed 8/137:00 pmSEA - LIS

1 stop18h 20mIcelandair

Sun 8/2410:20 pmLIS - SEA

1 stop21h 05mIcelandair

Deal found 4/29

$716

Fri 10/33:20 pmSEA - LIS

2 stops57h 40mScandinavian Airlines

Wed 10/157:15 amLIS - SEA

2 stops24h 09mScandinavian Airlines

Deal found 4/28

$717

Wed 10/221:30 pmSEA - LIS

1 stop16h 35mAmerican Airlines

Thu 10/3010:55 amLIS - SEA

1 stop17h 49mAmerican Airlines

Deal found 4/29

$728

Sun 10/54:20 pmSEA - LIS

1 stop20h 20mMultiple Airlines

Fri 10/246:45 amLIS - SEA

2 stops23h 28mMultiple Airlines

Deal found 4/29

$733

Wed 10/227:15 pmSEA - LIS

2 stops31h 50mAir Canada

Thu 10/3011:00 amLIS - SEA

2 stops41h 56mAir Canada

Deal found 4/29

$735

Tue 10/71:30 pmSEA - LIS

1 stop16h 55mBritish Airways

Tue 11/47:05 amLIS - SEA

1 stop17h 50mBritish Airways

Deal found 4/29

$743

Mon 12/82:00 pmSEA - OPO

1 stop17h 15mLufthansa

Mon 12/291:45 pmOPO - SEA

1 stop31h 35mLufthansa

Deal found 4/29

$744

Wed 11/51:33 amSEA - OPO

2 stops22h 07mIberia

Fri 11/148:40 pmOPO - SEA

2 stops21h 54mIberia

Deal found 4/29

$747

Wed 11/1910:10 amPDX - FAO

2 stops18h 10mMultiple Airlines

Wed 11/2612:10 pmFAO - PDX

2 stops41h 58mMultiple Airlines

Deal found 4/28

$754

Fri 12/512:28 amSEA - LIS

2 stops27h 22mIberia

Tue 12/166:30 amLIS - SEA

2 stops22h 45mIberia

Deal found 4/29

$775

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 30, 2025.

Wed 9/177:20 amSEA - OPO

1 stop18h 00mAir Canada

Wed 9/246:00 amOPO - SEA

2 stops24h 16mAir Canada

Deal found 4/28

$784

Mon 5/197:00 pmSEA - OPO

2 stops18h 55mMultiple Airlines

Wed 6/44:20 pmOPO - SEA

3 stops39h 50mMultiple Airlines

Deal found 4/28

$785

Sun 5/257:10 pmSEA - LIS

1 stop30h 45mTurkish Airlines

Tue 6/1010:55 amLIS - SEA

1 stop38h 20mTurkish Airlines

Deal found 4/29

$795

Tue 8/511:58 amSEA - OPO

1 stop13h 47mUnited Airlines

Fri 8/226:00 amOPO - SEA

1 stop13h 55mUnited Airlines

Deal found 4/29

$802

Tue 7/157:15 amSEA - LIS

1 stop16h 45mKLM

Wed 8/277:30 pmLIS - SEA

1 stop28h 25mKLM

Deal found 4/29

$809

Wed 10/811:15 amSEA - OPO

2 stops20h 15mDelta

Wed 10/295:00 amOPO - SEA

1 stop14h 50mDelta

Deal found 4/28

$819

Wed 10/81:45 pmSEA - OPO

2 stops20h 45mSWISS

Wed 10/297:30 pmOPO - SEA

2 stops34h 56mSWISS

Deal found 4/28

$821

Mon 8/254:00 pmSEA - OPO

1 stop35h 00mScandinavian Airlines

Mon 9/812:00 pmOPO - SEA

2 stops43h 24mScandinavian Airlines

Deal found 4/28

$842

Mon 6/307:25 pmPDX - LIS

1 stop19h 45mAmerican Airlines

Wed 7/911:05 amLIS - PDX

1 stop19h 01mAmerican Airlines

Deal found 4/29

$906

Tue 5/1310:00 amPDX - LIS

2 stops28h 05mLufthansa

Wed 6/115:05 amLIS - PDX

2 stops21h 40mLufthansa

Deal found 4/28

$910

Sat 6/77:14 amPDX - LIS

1 stop16h 46mAir France

Sat 6/215:40 amLIS - PDX

2 stops17h 13mAir France

Deal found 4/29

$923

Tue 5/137:25 pmPDX - LIS

1 stop14h 30mBritish Airways

Mon 5/1911:00 amLIS - PDX

1 stop14h 35mBritish Airways

Deal found 4/28

$937

Last-minute flights from Washington to Portugal
Discover last-minute flight deals from Washington to Portugal. Data last updated April 30, 2025 and is based on user searches.

Mon 5/53:45 pmSEA - LIS

2 stops16h 45mMultiple Airlines

Thu 5/1510:20 pmLIS - SEA

1 stop30h 20mMultiple Airlines

Deal found 4/29

$977

Mon 5/512:09 pmPDX - LIS

2 stops25h 26mAer Lingus

Tue 5/1310:15 pmLIS - PDX

2 stops33h 44mAer Lingus

Deal found 4/28

$1,068

Mon 5/511:10 pmPDX - LIS

2 stops33h 20mTAP AIR PORTUGAL

Tue 5/136:00 pmLIS - PDX

2 stops59h 55mTAP AIR PORTUGAL

Deal found 4/29

$1,082

Mon 5/56:45 pmSEA - LIS

1 stop18h 50mAer Lingus

Thu 5/1511:25 amLIS - SEA

1 stop14h 25mAer Lingus

Deal found 4/29

$1,167

Wed 5/72:40 pmSEA - LIS

2 stops35h 05mTurkish Airlines

Wed 6/410:55 amLIS - SEA

1 stop38h 20mTurkish Airlines

Deal found 4/29

$1,115

Wed 5/711:38 amSEA - LIS

2 stops61h 07mTAP AIR PORTUGAL

Wed 6/49:05 amLIS - SEA

2 stops33h 13mTAP AIR PORTUGAL

Deal found 4/29

$1,258

Wed 5/73:20 pmPDX - LIS

1 stop22h 00mIcelandair

Wed 5/144:10 pmLIS - PDX

2 stops33h 45mIcelandair

Deal found 4/28

$1,388

Thu 5/81:00 pmPDX - LIS

2 stops35h 55mScandinavian Airlines

Wed 5/147:15 amLIS - PDX

2 stops24h 00mScandinavian Airlines

Deal found 4/28

$967

Thu 5/83:20 pmPDX - LIS

2 stops21h 45mMultiple Airlines

Sun 5/186:00 amLIS - PDX

3 stops38h 42mMultiple Airlines

Deal found 4/28

$986

Fri 5/95:05 pmSEA - FAO

1 stop16h 35mCondor

Sat 5/176:35 pmFAO - SEA

1 stop28h 30mCondor

Deal found 4/29

$1,045

Fri 5/95:30 amSEA - FAO

2 stops25h 05mAir Canada

Sat 5/176:05 amFAO - SEA

3 stops35h 13mAir Canada

Deal found 4/29

$1,520

Sat 5/107:00 pmSEA - LIS

1 stop18h 20mIcelandair

Sat 5/177:10 amLIS - SEA

2 stops18h 40mIcelandair

Deal found 4/29

$1,010

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 30, 2025.

Sat 7/191:19 pmPDX - LIS

1 stop38h 26mMultiple Airlines

Deal found 4/29

$286

Fri 9/1211:30 pmSEA - OPO

3 stops51h 15mMultiple Airlines

Deal found 4/28

$335

Mon 5/127:00 pmSEA - FAO

3 stops28h 20mMultiple Airlines

Deal found 4/29

$355

Mon 5/123:20 pmPDX - OPO

3 stops34h 55mMultiple Airlines

Deal found 4/29

$368

Mon 7/711:30 pmSEA - LIS

2 stops33h 35mMultiple Airlines

Deal found 4/29

$385

Fri 9/511:30 pmSEA - FNC

3 stops56h 30mMultiple Airlines

Deal found 4/28

$419

Sat 9/64:00 pmSEA - OPO

1 stop35h 10mScandinavian Airlines

Deal found 4/28

$534

Wed 7/167:25 pmPDX - LIS

1 stop19h 45mBritish Airways

Deal found 4/29

$566

Sun 5/187:40 pmPDX - LIS

2 stops29h 40mAir Canada

Deal found 4/29

$571

Thu 6/59:15 pmSEA - PDL

3 stops50h 35mMultiple Airlines

Deal found 4/29

$575

Tue 5/136:50 amPDX - LIS

1 stop19h 40mUnited Airlines

Deal found 4/29

$576

Sun 5/187:35 pmSEA - FAO

1 stop15h 25mAer Lingus

Deal found 4/29

$577

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 8/13

7:00 pm-9:20 pm

1 stop18h 20m

Lisbon Humberto Delgado

Sun 8/24

10:20 pm-11:25 am

1 stop21h 05m

$716

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 10/3

3:20 pm-9:00 am

2 stops57h 40m

Lisbon Humberto Delgado

Wed 10/15

7:15 am-11:24 pm

2 stops24h 09m

$717

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 10/22

1:30 pm-2:05 pm

1 stop16h 35m

Lisbon Humberto Delgado

Thu 10/30

10:55 am-9:44 pm

1 stop17h 49m

$728

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 10/5

4:20 pm-8:40 pm

1 stop20h 20m

Lisbon Humberto Delgado

Fri 10/24

6:45 am-10:13 pm

2 stops23h 28m

$733

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 10/22

7:15 pm-11:05 am

2 stops31h 50m

Lisbon Humberto Delgado

Thu 10/30

11:00 am-9:56 pm

2 stops41h 56m

$735

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 10/7

1:30 pm-2:25 pm

1 stop16h 55m

Lisbon Humberto Delgado

Tue 11/4

7:05 am-4:55 pm

1 stop17h 50m

$743

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 8/12

12:30 pm-3:30 pm

1 stop19h 00m

Lisbon Humberto Delgado

Thu 8/21

5:55 am-5:15 pm

1 stop19h 20m

$776

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 9/17

7:20 am-9:20 am

1 stop18h 00m

Porto

Wed 9/24

6:00 am-10:16 pm

2 stops24h 16m

$784

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 5/19

7:00 pm-9:55 pm

2 stops18h 55m

Porto

Wed 6/4

4:20 pm-12:10 am

3 stops39h 50m

$785

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 10/18

7:40 pm-6:15 pm

2 stops38h 35m

Porto

Sun 10/26

6:15 am-6:24 pm

2 stops19h 09m

$789

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

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 $1,178). 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

7,929 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

7,929 reviews

Delta

8.0

Very good

7,929 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

1,334 reviews

Delta

8.0

Very good

7,929 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

1,588 reviews

Delta

8.0

Very good

7,929 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

1,446 reviews

Delta

8.0

Very good

7,929 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

8,696 reviews

Delta

8.0

Very good

7,929 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 Scandinavian Airlines. According to our data, you can fly for as low as $534. Users have also found prices from $566 and $571 on British Airways and Air Canada, 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 $1,178). 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$466	Average$652	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$581	Average$1,052	FlexibilityNo cancel fee	On-time70%
Lufthansa	Cheapest$632	Average$1,091	FlexibilityNo cancel fee	On-time76%
Delta	Cheapest$636	Average$1,096	FlexibilityNo cancel fee	On-timeN/A
Aer Lingus	Cheapest$639	Average$963	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$643	Average$1,022	FlexibilityNo cancel fee	On-time71%
KLM	Cheapest$649	Average$998	FlexibilityNo cancel fee	On-time75%
Scandinavian Airlines	Cheapest$652	Average$821	FlexibilityNo cancel fee	On-time77%
United Airlines	Cheapest$699	Average$1,157	FlexibilityNo cancel fee	On-time69%
Air Canada	Cheapest$703	Average$1,048	FlexibilityNo cancel fee	On-time67%

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$286+ 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 7/19. 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 April 30, 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 30, 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 30, 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 30, 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 30, 2025.