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$368+ 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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — OPO
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$714
(Gotogate)

One-way from

$368
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$1,215
Provider with most accurate pricing for Seattle/Tacoma Intl-Porto flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Porto flights.
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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. 16% potential increase in price ($214 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($25 potential savings vs. average RT price).
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Average for round-trip flights in May 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 May 1, 2025.

This FlightHub deal was found by Cheapflights users on 4/29. 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.
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
This Justfly.com deal was found by Cheapflights users on 4/29. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
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
This American Airlines deal was found by Cheapflights users on 4/30. 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.
Tue 8/51:33 pmSEA - OPO
2 stops18h 22mAmerican Airlines
Fri 8/228:15 amOPO - SEA
2 stops21h 17mAmerican Airlines
Deal found 4/30$722
This FlightHub deal was found by Cheapflights users on 4/30. 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.
Mon 12/82:00 pmSEA - OPO
1 stop24h 25mLufthansa
Mon 12/291:45 pmOPO - SEA
1 stop31h 35mLufthansa
Deal found 4/30$744
This Air Canada deal was found by Cheapflights users on 4/30. 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.
Sat 10/187:40 pmPDX - OPO
2 stops38h 35mAir Canada
Sun 10/266:15 amOPO - PDX
2 stops39h 29mAir Canada
Deal found 4/30$744
This Iberia deal was found by Cheapflights users on 4/29. 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.
Wed 11/51:33 amSEA - OPO
2 stops22h 07mIberia
Fri 11/148:40 pmOPO - SEA
2 stops21h 54mIberia
Deal found 4/29$747
This United Airlines deal was found by Cheapflights users on 4/29. 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.
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
This oojo deal was found by Cheapflights users on 4/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/17:10 pmSEA - OPO
1 stop36h 40mTurkish Airlines
Wed 10/2210:50 amOPO - SEA
1 stop31h 45mTurkish Airlines
Deal found 4/30$808
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Tue 10/79:54 amPDX - OPO
1 stop15h 51mUnited Airlines
Tue 10/216:00 amOPO - PDX
2 stops20h 31mUnited Airlines
Deal found 4/29$812
This KAYAK deal was found by Cheapflights users on 4/29. 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.
Wed 10/81:30 pmSEA - OPO
2 stops18h 25mBritish Airways
Wed 10/298:20 amOPO - SEA
2 stops22h 30mBritish Airways
Deal found 4/29$816
This Delta deal was found by Cheapflights users on 4/29. 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.
Wed 10/810:55 amSEA - OPO
2 stops20h 35mDelta
Wed 10/295:00 amOPO - SEA
1 stop14h 50mDelta
Deal found 4/29$819
This Delta deal was found by Cheapflights users on 4/29. 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.
Sat 10/1811:20 amPDX - OPO
2 stops20h 10mDelta
Sun 10/265:00 amOPO - PDX
1 stop14h 25mDelta
Deal found 4/29$844

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 May 1, 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

Sat 10/18

7:40 pm-6:15 pm

2 stops38h 35m

Porto

Sun 10/26

6:15 am-2:44 pm

2 stops39h 29m

$744

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 10/7

9:54 am-9:45 am

1 stop15h 51m

Porto

Tue 10/21

6:00 am-6:31 pm

2 stops20h 31m

$812

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 5/26

7:10 pm-3:50 pm

1 stop36h 40m

Porto

Tue 6/10

10:50 am-5:15 pm

1 stop38h 25m

$814

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 10/18

11:20 am-3:30 pm

2 stops20h 10m

Porto

Sun 10/26

5:00 am-12:25 pm

1 stop14h 25m

$844

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 10/18

1:15 pm-6:10 pm

1 stop20h 55m

Porto

Sun 10/26

5:00 am-12:25 pm

1 stop14h 25m

$845

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 6/10

7:15 pm-11:45 am

2 stops32h 30m

Porto

Tue 6/17

1:30 pm-2:16 pm

3 stops32h 46m

$877

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 7/7

7:15 pm-9:20 am

2 stops54h 05m

Porto

Fri 7/18

6:00 am-10:16 pm

2 stops24h 16m

$944

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 9/9

9:59 am-9:45 am

1 stop15h 46m

Porto

Tue 10/7

6:00 am-9:21 am

2 stops35h 21m

$948

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 6/9

7:20 am-9:35 am

1 stop18h 15m

Porto

Tue 9/9

12:50 pm-6:49 pm

2 stops37h 59m

$959

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 5/17

2:15 pm-10:45 pm

1 stop24h 30m

Porto

Sat 5/24

6:00 am-12:25 pm

1 stop14h 25m

$983

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 32 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 $1,071). 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 May 1, 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 May 1, 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
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

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
7,934 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

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
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

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
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

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
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

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.
Turkish Airlines
7.3
Good
3,790 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

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

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 American Airlines. According to our data, you can fly for as low as $596. Users have also found prices from $608 and $623 on United Airlines and Air Canada, 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 $1,071). 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$636Average$1,069FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$649Average$1,046FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$673Average$1,134FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$697Average$1,061FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$717Average$1,225FlexibilityNo cancel feeOn-time69%
Turkish AirlinesCheapest$765Average$859FlexibilityNo cancel feeOn-time77%

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