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$640+ Cheap flights from Porto (OPO) to Washington

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 7/6. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
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Cheap flight deals from Porto to Washington

Keep the following information in mind while searching for Porto to Washington flight deals. Data was last updated February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$791
(United Airlines)

One-way from

$640
(SmartFares)

Popular in

June

Cheapest in

October

Average price

$829
Provider with most accurate pricing for Porto-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Porto-Seattle/Tacoma Intl flights.
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From Porto to Washington
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One-way flight from Porto to Washington
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Highest demand for flights based on searches. 21% potential increase in price ($254 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($51 potential savings vs. average RT price).
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Average for round-trip flights in February 2025
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Find flight deals from Porto to Washington

Cheapest flights from Porto to Washington
Explore the most affordable flight options available from Porto to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2025.

This United Airlines deal was found by Cheapflights users on 2/20. 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.
Thu 3/66:00 amOPO - SEA
2 stops47h 30mUnited Airlines
Sun 3/95:15 amSEA - OPO
2 stops26h 55mUnited Airlines
Deal found 2/20$791
This Gotogate deal was found by Cheapflights users on 2/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/612:10 pmOPO - SEA
1 stop32h 15mLufthansa
Sun 4/136:50 pmSEA - OPO
1 stop20h 30mLufthansa
Deal found 2/20$798
This Delta deal was found by Cheapflights users on 2/20. 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.
Thu 3/66:15 amOPO - SEA
2 stops24h 10mDelta
Sun 3/91:35 pmSEA - OPO
1 stop14h 20mDelta
Deal found 2/20$803
This Mytrip deal was found by Cheapflights users on 2/20. 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.
Sun 4/67:35 amOPO - SEA
3 stops43h 34mMultiple Airlines
Sun 4/137:05 pmSEA - OPO
3 stops32h 35mMultiple Airlines
Deal found 2/20$872
This Cheapflightsfares deal was found by Cheapflights users on 2/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/209:20 pmOPO - SEA
1 stop22h 15mBritish Airways
Thu 5/18:20 pmSEA - OPO
1 stop16h 05mBritish Airways
Deal found 2/20$4,154

Find flights from Porto to Washington within your budget

Customize your flight search to find flights from Porto to Washington 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 February 20, 2025.

Fly from

Porto

Fly to

Washington

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/6

6:00 am-9:30 pm

2 stops47h 30m

Seattle/Tacoma Intl

Sun 3/9

5:15 am-3:10 pm

2 stops26h 55m

$791

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 4/6

12:10 pm-12:25 pm

1 stop32h 15m

Seattle/Tacoma Intl

Sun 4/13

6:50 pm-11:20 pm

1 stop20h 30m

$798

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/6

6:15 am-10:25 pm

2 stops24h 10m

Seattle/Tacoma Intl

Sun 3/9

1:35 pm-10:55 am

1 stop14h 20m

$803

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 4/6

7:35 am-7:09 pm

3 stops43h 34m

Seattle/Tacoma Intl

Sun 4/13

7:05 pm-11:40 am

3 stops32h 35m

$872

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 4/20

9:20 pm-11:35 am

1 stop22h 15m

Seattle/Tacoma Intl

Thu 5/1

8:20 pm-8:25 pm

1 stop16h 05m

$4,154

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 7/6

4:50 pm-5:15 pm

1 stop32h 25m

$640

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 5/5

10:35 pm-10:13 am

3 stops43h 38m

$905

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 7/6

12:15 pm-10:44 am

3 stops30h 29m

$1,031

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 7/5

2:50 am-2:55 pm

2 stops44h 05m

$1,081

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 5/5

9:15 pm-11:10 am

1 stop21h 55m

$1,337

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Best time to book a flight from Porto to Washington

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

Travel insights for flights from Porto to Washington

Get recent, data-driven insights about flights from Porto to Washington including ideal travel times, pricing trends, and more.

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

Currently, January is the cheapest month in which you can book a flight from Porto to State of Washington (average of $238). Flying from Porto to State of Washington in July is currently the most expensive (average of $411). 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.

Rainfall in Washington by month

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

In terms of precipitation, rainfall in State of Washington ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit State of Washington when rainfall is around 0.7 in.

Temperature in Washington by month

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

If weather is an important factor for your trip to State of Washington, 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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated February 20, 2025.
Delta
8.0
Very good
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very good
8,219 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

SWISS
7.5
Good
1,568 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

United Airlines
7.4
Good
8,765 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Turkish Airlines
7.3
Good
3,832 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Lufthansa
6.7
Okay
6,986 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

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

  • What airport do you fly from for flights from Porto to Washington?

    Most people fly from Porto (OPO) if they book a flight from Porto to Washington. Porto is conveniently located just 6.8 mi from Porto’s city center.

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

    To fly one-way, consider booking your trip with Turkish Airlines, which is currently one of the cheapest options available, starting at $640. United Airlines flights start at $1,031 while deals on SWISS start at $1,081 one-way.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Porto to State of Washington (average of $238). Flying from Porto to State of Washington in July is currently the most expensive (average of $411). 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 Porto to Washington

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Top airline flying from Porto to Washington

Discover the top airline that operate flights from Porto to Washington. 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$756Average$968FlexibilityNo cancel feeOn-time75%
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