HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Washington

$321+ 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 10/22. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Jun 28 — Jul 51
Sat 6/28
Sat 7/5
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Porto to Washington with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 June 23, 2025.

Round-trip from

$744
(Kiwi.com)

One-way from

$321
(Kiwi.com)

Popular in

July

Cheapest in

October

Average price

$865
From Porto to Washington
Search Deals
One-way flight from Porto to Washington
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($61 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals

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 June 23, 2025.

This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1610:00 pmOPO - SEA
2 stops44h 35mMultiple Airlines
Mon 11/36:30 amSEA - OPO
1 stop21h 20mMultiple Airlines
Deal found 6/20$744
This Gotogate deal was found by Cheapflights users on 6/20. 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.
Thu 10/166:00 amOPO - SEA
1 stop13h 55mLufthansa
Mon 11/32:00 pmSEA - OPO
1 stop24h 25mLufthansa
Deal found 6/20$840
This United Airlines deal was found by Cheapflights users on 6/23. 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.
Sat 9/276:00 amOPO - SEA
2 stops41h 52mUnited Airlines
Wed 12/1712:36 pmSEA - OPO
2 stops42h 09mUnited Airlines
Deal found 6/23$876
This American Airlines deal was found by Cheapflights users on 6/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/248:15 amOPO - SEA
2 stops19h 54mAmerican Airlines
Sun 12/147:42 amSEA - OPO
2 stops28h 18mAmerican Airlines
Deal found 6/23$889
This Gotogate deal was found by Cheapflights users on 6/21. 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.
Fri 7/410:45 amOPO - SEA
1 stop31h 50mTurkish Airlines
Wed 7/97:10 pmSEA - OPO
1 stop30h 35mTurkish Airlines
Deal found 6/21$979
This KLM deal was found by Cheapflights users on 6/21. 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.
Tue 8/56:50 pmOPO - SEA
1 stop24h 45mKLM
Tue 8/121:30 pmSEA - OPO
1 stop18h 00mKLM
Deal found 6/21$1,063
This Delta deal was found by Cheapflights users on 6/21. 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.
Tue 8/56:15 amOPO - SEA
2 stops24h 01mDelta
Tue 8/121:30 pmSEA - OPO
1 stop18h 00mDelta
Deal found 6/21$1,070
This British Airways deal was found by Cheapflights users on 6/23. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/248:20 pmOPO - SEA
2 stops31h 49mBritish Airways
Mon 12/157:42 amSEA - OPO
2 stops28h 18mBritish Airways
Deal found 6/23$1,099
This Iberia deal was found by Cheapflights users on 6/23. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/268:15 amOPO - SEA
2 stops20h 36mIberia
Mon 12/1510:30 amSEA - OPO
2 stops21h 30mIberia
Deal found 6/23$1,100
This Travelocity deal was found by Cheapflights users on 6/22. 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.
Tue 8/1911:25 amOPO - SEA
2 stops34h 25mScandinavian Airlines
Sat 8/304:00 pmSEA - OPO
1 stop35h 10mScandinavian Airlines
Deal found 6/22$3,257

Cheapflights Fare Finder

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 June 23, 2025.
Use the filters below to find and compare flights from Porto to Washington that are best for you.

Fly from

Porto

Fly to

Washington

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/16

10:00 pm-10:35 am

2 stops44h 35m

Seattle/Tacoma Intl

Mon 11/3

6:30 am-11:50 am

1 stop21h 20m

$744

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/16

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Mon 11/3

2:00 pm-10:25 pm

1 stop24h 25m

$840

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 9/27

6:00 am-3:52 pm

2 stops41h 52m

Seattle/Tacoma Intl

Wed 12/17

12:36 pm-2:45 pm

2 stops42h 09m

$876

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 9/24

8:15 am-8:09 pm

2 stops19h 54m

Seattle/Tacoma Intl

Sun 12/14

7:42 am-8:00 pm

2 stops28h 18m

$889

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 7/4

10:45 am-10:35 am

1 stop31h 50m

Seattle/Tacoma Intl

Wed 7/9

7:10 pm-9:45 am

1 stop30h 35m

$979

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 8/5

6:50 pm-11:35 am

1 stop24h 45m

Seattle/Tacoma Intl

Tue 8/12

1:30 pm-3:30 pm

1 stop18h 00m

$1,063

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 8/5

6:15 am-10:16 pm

2 stops24h 01m

Seattle/Tacoma Intl

Tue 8/12

1:30 pm-3:30 pm

1 stop18h 00m

$1,070

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 9/24

8:20 pm-8:09 pm

2 stops31h 49m

Seattle/Tacoma Intl

Mon 12/15

7:42 am-8:00 pm

2 stops28h 18m

$1,099

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 9/26

8:15 am-8:51 pm

2 stops20h 36m

Seattle/Tacoma Intl

Mon 12/15

10:30 am-4:00 pm

2 stops21h 30m

$1,100

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 8/19

11:25 am-1:50 pm

2 stops34h 25m

Seattle/Tacoma Intl

Sat 8/30

4:00 pm-11:10 am

1 stop35h 10m

$3,257

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/23

Showing 1-10 of 16 results
1
2

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.

Cheapflights Insights

Everything you need to know about your flight from Porto to Washington

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 June 23, 2025.
Delta
8.0
Very good
7,966 reviews

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,966 reviews
Delta
8.0
Very good
7,966 reviews

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,365 reviews
Delta
8.0
Very good
7,966 reviews

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,831 reviews
Delta
8.0
Very good
7,966 reviews

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Turkish Airlines
7.3
Good
3,867 reviews
Delta
8.0
Very good
7,966 reviews

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Scandinavian Airlines
7.3
Good
1,402 reviews
Delta
8.0
Very good
7,966 reviews

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 $677. Iberia flights start at $736 while deals on United Airlines start at $981 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 $391). 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

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

Alternative routes for Porto to Washington

See prices for flight routes from nearby airports that may be better suited for you.
Lisbon to Newark flights
Lisbon to John F Kennedy Intl flights
Lisbon to LaGuardia flights
Porto to West Palm Beach flights
Lisbon to Miami flights
Porto to Newark flights
Porto to Miami flights
Lisbon to Los Angeles flights
Lisbon to San Francisco flights
Lisbon to Boston flights
Lisbon to O'Hare Intl flights
Porto to Fort Lauderdale flights
Porto to John F Kennedy Intl flights
Porto to LaGuardia flights
Lisbon to Fort Lauderdale flights
Lisbon to West Palm Beach flights
Faro to Newark flights
Lisbon to Dulles Intl flights
Lisbon to Seattle flights
Faro to John F Kennedy Intl flights
Faro to LaGuardia flights
Lisbon to Orlando flights
Ponta Delgada to John F Kennedy Intl flights
Ponta Delgada to Boston flights
Ponta Delgada to Newark flights
Lisbon to Philadelphia flights
Porto to Boston flights
Porto to Orlando flights
Lisbon to Baltimore flights
Lisbon to Reagan-National flights
Lisbon to Stewart flights
Porto to O'Hare Intl flights
Lisbon to San Diego flights
Porto to Los Angeles flights
Lisbon to Charlotte flights
Lisbon to Dallas/Fort Worth flights
Lisbon to Santa Ana flights
Porto to Baltimore flights
Porto to Reagan-National flights
Porto to Dulles Intl flights
Porto to San Francisco flights
Ponta Delgada to LaGuardia flights
Lisbon to Denver flights
Lajes to John F Kennedy Intl flights
Lisbon to Austin flights
Lisbon to Las Vegas flights

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 June 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$756Average$848FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.