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$360+ 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 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — OPO
Jan 7 — Jan 141
Wed 1/7
Wed 1/14
1 adult, Economy
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Cheap 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 December 8, 2025.

This Delta deal was found by Cheapflights users on 12/7. 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 12/3010:03 amPDX - OPO
2 stops21h 22mDelta
Thu 1/225:00 amOPO - PDX
2 stops22h 13mDelta
Deal found 12/7$698
This Air France deal was found by Cheapflights users on 12/8. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:19 amPDX - OPO
2 stops17h 11mMultiple Airlines
Thu 1/2211:15 amOPO - PDX
1 stop32h 10mMultiple Airlines
Deal found 12/8$967
This Air Europa deal was found by Cheapflights users on 12/6. 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 Europa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/611:30 amSEA - OPO
2 stops23h 50mAir Europa
Wed 12/1011:35 amOPO - SEA
2 stops40h 38mAir Europa
Deal found 12/6$1,224
This Mytrip deal was found by Cheapflights users on 12/6. 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.
Wed 12/103:40 pmSEA - OPO
3 stops32h 30mMultiple Airlines
Wed 12/179:55 pmOPO - SEA
3 stops29h 21mMultiple Airlines
Deal found 12/6$1,232
This Rumbo deal was found by Cheapflights users on 12/6. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/611:30 amSEA - OPO
2 stops19h 45mMultiple Airlines
Wed 12/104:10 pmOPO - SEA
1 stop32h 55mMultiple Airlines
Deal found 12/6$1,325
This Kiwi.com deal was found by Cheapflights users on 12/6. 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 12/1111:10 pmSEA - OPO
2 stops40h 15mMultiple Airlines
Mon 12/156:40 pmOPO - SEA
1 stop24h 00mMultiple Airlines
Deal found 12/6$1,330
This Gotogate deal was found by Cheapflights users on 12/6. 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 12/117:00 pmSEA - OPO
1 stop30h 55mTurkish Airlines
Mon 12/154:10 pmOPO - SEA
1 stop32h 55mTurkish Airlines
Deal found 12/6$1,468
This Ovago deal was found by Cheapflights users on 12/7. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/108:30 amPDX - OPO
2 stops20h 45mLufthansa
Fri 12/196:30 amOPO - PDX
2 stops22h 37mLufthansa
Deal found 12/7$1,744
This KAYAK deal was found by Cheapflights users on 12/7. 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.
Tue 12/910:10 amPDX - OPO
2 stops28h 15mLufthansa
Sun 1/116:00 amOPO - PDX
2 stops24h 32mLufthansa
Deal found 12/7$1,931
This Delta deal was found by Cheapflights users on 12/6. 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 12/911:35 amPDX - OPO
2 stops14h 55mDelta
Sun 1/115:00 amOPO - PDX
1 stop14h 25mDelta
Deal found 12/6$2,006
This KLM deal was found by Cheapflights users on 12/7. 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.
Sun 12/211:25 pmPDX - OPO
1 stop13h 05mKLM
Fri 1/94:10 pmOPO - PDX
2 stops34h 40mKLM
Deal found 12/7$2,153
This Ovago deal was found by Cheapflights users on 12/6. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/212:20 pmPDX - OPO
2 stops41h 40mMultiple Airlines
Fri 1/98:20 amOPO - PDX
2 stops20h 07mMultiple Airlines
Deal found 12/6$2,207

Find flight deals from Washington to Porto

Keep the following information in mind while searching for Washington to Porto flight deals. Data was last updated December 8, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$447
(Kiwi.com)

One-way from

$360
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$1,306
Provider with most accurate pricing for Seattle/Tacoma Intl-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Porto flights.
Search Deals
From Washington to Porto
Search Deals
One-way flight from Washington to Porto
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($180 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 8, 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

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 2/11

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Sun 2/22

6:15 am-10:06 pm

2 stops23h 51m

$459

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/10

1:40 pm-10:30 am

1 stop12h 50m

Porto

Thu 2/19

5:00 am-11:40 am

1 stop14h 40m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 1/12

2:10 pm-10:30 am

1 stop36h 20m

Porto

Tue 1/20

11:15 am-11:50 am

1 stop32h 35m

$479

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 1/17

7:00 am-10:30 am

2 stops19h 30m

Porto

Sun 2/1

5:00 am-11:25 am

1 stop14h 25m

$482

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 1/13

9:20 am-10:30 am

2 stops17h 10m

Porto

Sat 1/31

11:15 am-11:25 am

1 stop32h 10m

$482

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 1/18

6:00 am-10:30 am

2 stops20h 30m

Porto

Fri 1/30

5:00 am-11:25 am

1 stop14h 25m

$482

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 1/21

1:25 pm-7:20 pm

1 stop21h 55m

Porto

Wed 1/28

5:00 am-11:25 am

1 stop14h 25m

$483

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 1/14

1:25 pm-7:20 pm

1 stop21h 55m

Porto

Thu 1/29

4:10 pm-11:25 am

1 stop27h 15m

$483

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/20

3:10 pm-3:25 pm

1 stop16h 15m

Porto

Tue 1/27

5:00 am-11:50 am

1 stop14h 50m

$484

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/20

3:10 pm-10:30 am

1 stop35h 20m

Porto

Tue 1/27

5:00 am-11:50 am

1 stop14h 50m

$484

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/6

Showing 1-10 of 27 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 $538). Flying from State of Washington to Porto in June is currently the most expensive (average of $1,000). 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 December 8, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 24% on flights from State of Washington to Porto by exploring options for tickets in the evening.

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.

  • How long is the flight from State of Washington to Porto?

    Lufthansa, KLM, and Delta can get you from State of Washington to Porto in just under 14h 05m. Your travel time can differ by up to 22h 10m. There are 5083 mi between State of Washington and Porto. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    For one-way options, check prices for KLM. According to our data, you can fly for as low as $508. Users have also found prices from $524 and $541 on Delta and Turkish Airlines, 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 $538). Flying from State of Washington to Porto in June is currently the most expensive (average of $1,000). 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 Porto?

Book flights to Porto if you plan to visit one of these locations
Aveiro
Arcos de Valdevez
Coimbra
Vila Nova de Gaia

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Top 5 airlines flying from Washington to Porto

Discover the top 5 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 December 8, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$591Average$1,014FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$619Average$932FlexibilityNo cancel feeOn-time76%
KLMCheapest$659Average$1,041FlexibilityNo cancel feeOn-time75%
Turkish AirlinesCheapest$665Average$845FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$679Average$1,199FlexibilityNo cancel feeOn-time69%

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