HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Washington

$344+ 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 5/8. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Apr 7 — Apr 141
Mon 4/7
Mon 4/14
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 April 2, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$490
(Booking.com)

One-way from

$344
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$848
Provider with most accurate pricing for Porto-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Porto-Seattle/Tacoma Intl flights.
Search Deals
From Porto to Washington
Search Deals
One-way flight from Porto to Washington
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($236 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($52 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 2, 2025.

This Mytrip deal was found by Cheapflights users on 4/1. 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.
Thu 5/88:50 amOPO - SEA
3 stops47h 20mMultiple Airlines
Mon 5/193:45 pmSEA - OPO
2 stops23h 20mMultiple Airlines
Deal found 4/1$753
This Delta deal was found by Cheapflights users on 4/1. 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 5/86:30 amOPO - SEA
1 stop17h 27mDelta
Mon 5/1910:25 amSEA - OPO
2 stops21h 05mDelta
Deal found 4/1$771
This KLM deal was found by Cheapflights users on 4/1. 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.
Thu 5/86:30 amOPO - SEA
1 stop17h 27mKLM
Mon 5/196:07 pmSEA - OPO
1 stop15h 48mKLM
Deal found 4/1$777
This United Airlines deal was found by Cheapflights users on 4/1. 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.
Wed 4/306:00 amOPO - SEA
1 stop14h 25mUnited Airlines
Mon 5/122:15 pmSEA - OPO
1 stop17h 30mUnited Airlines
Deal found 4/1$818
This lol.travel deal was found by Cheapflights users on 4/1. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/166:15 amOPO - SEA
1 stop18h 44mLufthansa
Sat 4/192:15 pmSEA - OPO
1 stop24h 30mLufthansa
Deal found 4/1$885
This SmartFares deal was found by Cheapflights users on 4/1. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/194:50 pmOPO - SEA
1 stop32h 25mTurkish Airlines
Sat 6/2812:30 pmSEA - OPO
1 stop18h 35mTurkish Airlines
Deal found 4/1$897
This Air Canada deal was found by Cheapflights users on 4/1. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1712:50 pmOPO - SEA
2 stops32h 11mAir Canada
Wed 6/2510:00 amSEA - OPO
2 stops15h 20mAir Canada
Deal found 4/1$994
This SWISS deal was found by Cheapflights users on 4/1. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/167:20 pmOPO - SEA
2 stops31h 13mSWISS
Mon 6/304:25 pmSEA - OPO
1 stop31h 30mSWISS
Deal found 4/1$1,020
This FlightHub deal was found by Cheapflights users on 4/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/188:15 amOPO - SEA
2 stops19h 48mIberia
Fri 6/271:30 pmSEA - OPO
2 stops18h 25mIberia
Deal found 4/1$1,864
This FlightHub deal was found by Cheapflights users on 4/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/209:00 amOPO - SEA
2 stops21h 10mTAP AIR PORTUGAL
Fri 6/279:50 pmSEA - OPO
1 stop29h 05mTAP AIR PORTUGAL
Deal found 4/1$1,946
This FlightHub deal was found by Cheapflights users on 4/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/187:35 amOPO - SEA
2 stops20h 43mAir Europa
Sun 6/2911:31 amSEA - OPO
2 stops19h 44mAir Europa
Deal found 4/1$2,916

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 April 2, 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 5/8

8:50 am-12:10 am

3 stops47h 20m

Seattle/Tacoma Intl

Mon 5/19

3:45 pm-11:05 pm

2 stops23h 20m

$753

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 5/8

6:30 am-3:57 pm

1 stop17h 27m

Seattle/Tacoma Intl

Mon 5/19

10:25 am-3:30 pm

2 stops21h 05m

$771

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 5/8

6:30 am-3:57 pm

1 stop17h 27m

Seattle/Tacoma Intl

Mon 5/19

6:07 pm-5:55 pm

1 stop15h 48m

$777

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 4/30

6:00 am-12:25 pm

1 stop14h 25m

Seattle/Tacoma Intl

Mon 5/12

2:15 pm-3:45 pm

1 stop17h 30m

$818

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 4/16

6:15 am-4:59 pm

1 stop18h 44m

Seattle/Tacoma Intl

Sat 4/19

2:15 pm-10:45 pm

1 stop24h 30m

$885

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 6/19

4:50 pm-5:15 pm

1 stop32h 25m

Seattle/Tacoma Intl

Sat 6/28

12:30 pm-3:05 pm

1 stop18h 35m

$897

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 6/17

12:50 pm-1:01 pm

2 stops32h 11m

Seattle/Tacoma Intl

Wed 6/25

10:00 am-9:20 am

2 stops15h 20m

$994

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 6/16

7:20 pm-6:33 pm

2 stops31h 13m

Seattle/Tacoma Intl

Mon 6/30

4:25 pm-7:55 am

1 stop31h 30m

$1,020

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 6/18

8:15 am-8:03 pm

2 stops19h 48m

Seattle/Tacoma Intl

Fri 6/27

1:30 pm-3:55 pm

2 stops18h 25m

$1,864

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 6/20

9:00 am-10:10 pm

2 stops21h 10m

Seattle/Tacoma Intl

Fri 6/27

9:50 pm-10:55 am

1 stop29h 05m

$1,946

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 14 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

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 April 2, 2025.
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

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
7,899 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

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
KLM
7.8
Good
1,323 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

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
1,572 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

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
8,615 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

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
3,748 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

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.

  • 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

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.
Porto to Newark flights
Lisbon to John F Kennedy Intl flights
Lisbon to Newark flights
Lisbon to Miami flights
Porto to John F Kennedy Intl flights
Porto to LaGuardia flights
Lisbon to Los Angeles flights
Lisbon to San Francisco flights
Lisbon to Boston flights
Lisbon to LaGuardia flights
Porto to Miami flights
Lisbon to West Palm Beach flights
Lisbon to Philadelphia flights
Lisbon to O'Hare Intl flights
Lisbon to Dulles Intl flights
Faro to Newark flights
Lisbon to Seattle flights
Porto to Fort Lauderdale flights
Porto to West Palm Beach flights
Ponta Delgada to Boston flights
Faro to John F Kennedy Intl flights
Lisbon to Orlando flights
Lisbon to Dallas/Fort Worth flights
Lisbon to Fort Lauderdale flights
Faro to LaGuardia flights
Porto to Boston flights
Lisbon to Reagan-National flights
Ponta Delgada to Newark flights
Ponta Delgada to John F Kennedy Intl flights
Lisbon to Baltimore flights
Ponta Delgada to LaGuardia flights
Lisbon to Denver flights
Lisbon to Las Vegas flights
Lisbon to Stewart flights
Porto to Los Angeles flights
Porto to Orlando flights
Porto to Oakland flights
Porto to O'Hare Intl flights
Lisbon to Hobby flights
Lisbon to Tampa flights
Porto to Dulles Intl flights
Porto to San Francisco flights
Lisbon to Portland flights
Porto to Honolulu flights
Lisbon to Sky Harbor Intl flights
Porto to Reagan-National 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 April 2, 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.