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$282+ Cheap flights from Washington to Porto (OPO)

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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — OPO
Jun 28 — Jul 51
Sat 6/28
Sat 7/5
1 adult, Economy
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Cheap flight deals from Washington to Porto

Keep the following information in mind while searching for Washington to Porto flight deals. Data was last updated June 23, 2025.

Round-trip from

$593
(United Airlines)

One-way from

$282
(Mytrip)

Popular in

June

Cheapest in

January

Average price

$1,328
From Washington to Porto
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One-way flight from Washington to Porto
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Highest demand for flights based on searches. 17% potential increase in price ($220 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Washington to Porto

Cheapest flights from Washington to Porto
Explore the most affordable flight options available from Washington to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 23, 2025.

This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1611:59 pmPDX - OPO
2 stops25h 31mUnited Airlines
Tue 12/912:30 pmOPO - PDX
2 stops19h 56mUnited Airlines
Deal found 6/21$593
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/191:00 pmPDX - OPO
2 stops43h 55mScandinavian Airlines
Mon 12/85:35 pmOPO - PDX
2 stops36h 45mScandinavian Airlines
Deal found 6/21$600
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/310:10 amPDX - OPO
2 stops20h 45mMultiple Airlines
Mon 11/171:45 pmOPO - PDX
2 stops56h 59mMultiple Airlines
Deal found 6/22$604
This Iberia 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/168:01 amPDX - OPO
2 stops23h 59mIberia
Mon 12/812:25 pmOPO - PDX
2 stops30h 00mIberia
Deal found 6/21$607
This Lufthansa 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1910:05 amPDX - OPO
2 stops29h 40mLufthansa
Tue 12/96:00 amOPO - PDX
2 stops20h 20mLufthansa
Deal found 6/21$611
This SWISS 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2110:46 amPDX - OPO
2 stops40h 39mSWISS
Mon 11/37:20 pmOPO - PDX
2 stops35h 13mSWISS
Deal found 6/22$616
This Lufthansa 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/103:10 pmSEA - OPO
1 stop14h 00mLufthansa
Mon 12/154:15 pmOPO - SEA
1 stop27h 55mLufthansa
Deal found 6/23$619
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/25:55 amPDX - OPO
2 stops20h 55mDelta
Tue 12/911:15 amOPO - PDX
1 stop32h 10mDelta
Deal found 6/22$630
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/307:05 pmPDX - OPO
2 stops35h 50mAir Canada
Fri 12/126:15 amOPO - PDX
2 stops20h 09mAir Canada
Deal found 6/22$649
This CrystalTravel 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/67:10 pmSEA - OPO
1 stop30h 35mTurkish Airlines
Wed 8/134:50 pmOPO - SEA
1 stop25h 45mTurkish Airlines
Deal found 6/20$650
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/184:00 pmSEA - OPO
1 stop35h 00mScandinavian Airlines
Fri 9/55:55 pmOPO - SEA
1 stop27h 55mScandinavian Airlines
Deal found 6/21$667
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3111:50 pmSEA - OPO
2 stops28h 50mUnited Airlines
Mon 11/1012:30 pmOPO - SEA
2 stops41h 26mUnited Airlines
Deal found 6/21$680

Cheapflights Fare Finder

Customize your flight search to find flights from Washington to Porto 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 Washington to Porto that are best for you.

Fly from

Washington

Fly to

Porto

Route

Depart

Return

Price

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 11/16

11:59 pm-9:30 am

2 stops25h 31m

Porto

Tue 12/9

12:30 pm-12:26 am

2 stops19h 56m

$593

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/19

1:00 pm-4:55 pm

2 stops43h 55m

Porto

Mon 12/8

5:35 pm-10:20 pm

2 stops36h 45m

$600

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 11/3

10:10 am-2:55 pm

2 stops20h 45m

Porto

Mon 11/17

1:45 pm-2:44 pm

2 stops56h 59m

$604

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 11/16

8:01 am-4:00 pm

2 stops23h 59m

Porto

Mon 12/8

12:25 pm-10:25 am

2 stops30h 00m

$607

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/19

10:52 am-11:45 pm

2 stops28h 53m

Porto

Wed 12/10

6:00 am-6:20 pm

2 stops20h 20m

$611

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 10/21

10:46 am-11:25 am

2 stops40h 39m

Porto

Mon 11/3

7:20 pm-10:33 pm

2 stops35h 13m

$616

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 12/10

3:10 pm-1:10 pm

1 stop14h 00m

Porto

Mon 12/15

4:15 pm-12:10 pm

1 stop27h 55m

$619

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 12/2

9:10 am-10:50 am

2 stops17h 40m

Porto

Thu 12/11

11:15 am-11:25 am

1 stop32h 10m

$630

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 11/30

7:05 pm-2:55 pm

2 stops35h 50m

Porto

Fri 12/12

6:15 am-6:24 pm

2 stops20h 09m

$649

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 8/6

7:10 pm-9:45 am

1 stop30h 35m

Porto

Wed 8/13

4:50 pm-10:35 am

1 stop25h 45m

$650

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/22

Showing 1-10 of 42 results
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Best time to book a flight from Washington to Porto

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

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

Currently, January is the cheapest month in which you can book a flight from State of Washington to Porto (average of $523). Flying from State of Washington to Porto in June is currently the most expensive (average of $1,040). 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 OPO?

Find hourly flight availability from Washington to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 23, 2025.

When flying from State of Washington to Porto, 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 Porto by month

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

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

Temperature in Porto by month

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

If weather is an important factor for your trip to Porto, 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 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated June 23, 2025.
See what other customers who have flown with Delta, KLM and SWISS from Washington to Porto have to say. 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
7,965 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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
7,965 reviews
Delta
8.0
Very good
7,965 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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
7,965 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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!
SWISS
7.5
Good
1,645 reviews
Delta
8.0
Very good
7,965 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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
7,965 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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
7,965 reviews

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

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 Washington to Porto. 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 into for flights to Porto from Washington?

    Porto (OPO) is the airport you will fly into if you book a flight from Washington to Porto. It is only a 6.8 mi journey from Porto (OPO) to Porto’s city center.

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

    For one-way options, check prices for TAP AIR PORTUGAL. According to our data, you can fly for as low as $407. Users have also found prices from $468 and $487 on United Airlines and Delta, respectively.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from State of Washington to Porto (average of $523). Flying from State of Washington to Porto in June is currently the most expensive (average of $1,040). 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

Traveling to a place near Washington?

Book flights to Washington if you plan to visit one of these locations
Aveiro
Coimbra
Matosinhos
Arcos de Valdevez

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Alternative routes for Washington to Porto

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Washington to Porto

Discover the top 6 airlines that operate flights from Washington to Porto. 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
DeltaCheapest$636Average$1,051FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$642Average$993FlexibilityNo cancel feeOn-time76%
KLMCheapest$648Average$1,010FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$673Average$1,134FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$679Average$1,201FlexibilityNo cancel feeOn-time69%
Turkish AirlinesCheapest$759Average$845FlexibilityNo cancel feeOn-time77%

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