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$262+ 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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — OPO
Mar 8 — Mar 151
Sun 3/8
Sun 3/15
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 February 6, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
Wed 3/114:10 pm
SEA
-
OPO
1 stop14h 05m
Lufthansa
Thu 3/192:05 pm
OPO
-
SEA
1 stop31h 15m
Lufthansa
Deal found 2/4$451
This Air France deal was found by Cheapflights users on 2/4. 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.
Wed 3/47:00 am
PDX
-
OPO
2 stops19h 30m
Multiple Airlines
Sun 3/85:00 am
OPO
-
PDX
1 stop14h 25m
Multiple Airlines
Deal found 2/4$484
This Justfly.com deal was found by Cheapflights users on 2/5. 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.
Fri 3/63:10 pm
SEA
-
OPO
1 stop24h 30m
Multiple Airlines
Fri 3/136:00 am
OPO
-
SEA
2 stops47h 16m
Multiple Airlines
Deal found 2/5$488
This Mytrip deal was found by Cheapflights users on 2/6. 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.
Tue 3/103:00 pm
SEA
-
OPO
1 stop16h 45m
Lufthansa
Fri 3/206:30 am
OPO
-
SEA
1 stop14h 50m
Lufthansa
Deal found 2/6$491
This Air France deal was found by Cheapflights users on 2/3. 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.
Wed 3/47:00 am
PDX
-
OPO
2 stops19h 30m
Multiple Airlines
Wed 3/115:00 am
OPO
-
PDX
2 stops22h 25m
Multiple Airlines
Deal found 2/3$495
This Expedia deal was found by Cheapflights users on 2/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/181:30 pm
SEA
-
OPO
2 stops38h 15m
Iberia
Wed 4/2912:25 pm
OPO
-
SEA
2 stops20h 19m
Iberia
Deal found 2/5$506
This United Airlines deal was found by Cheapflights users on 2/4. 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 3/119:20 am
SEA
-
OPO
2 stops23h 05m
United Airlines
Thu 3/1912:30 pm
OPO
-
SEA
2 stops19h 29m
United Airlines
Deal found 2/4$508
This United Airlines deal was found by Cheapflights users on 2/5. 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 4/1211:59 pm
PDX
-
OPO
2 stops27h 16m
United Airlines
Fri 4/246:00 am
OPO
-
PDX
2 stops26h 44m
United Airlines
Deal found 2/5$508
This United Airlines deal was found by Cheapflights users on 2/4. 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.
Mon 3/1611:59 pm
SEA
-
OPO
2 stops26h 31m
United Airlines
Mon 3/2312:30 pm
OPO
-
SEA
2 stops37h 20m
United Airlines
Deal found 2/4$513
This KAYAK deal was found by Cheapflights users on 2/4. 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 3/43:50 pm
PDX
-
OPO
2 stops46h 35m
Lufthansa
Sun 3/86:00 am
OPO
-
PDX
2 stops44h 14m
Lufthansa
Deal found 2/4$513
This United Airlines deal was found by Cheapflights users on 2/3. 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 3/47:00 am
PDX
-
OPO
2 stops20h 40m
United Airlines
Wed 3/1112:35 pm
OPO
-
PDX
1 stop16h 17m
United Airlines
Deal found 2/3$517
This United Airlines deal was found by Cheapflights users on 2/5. 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 4/1811:35 am
SEA
-
OPO
3 stops39h 40m
United Airlines
Wed 4/296:00 am
OPO
-
SEA
2 stops20h 00m
United Airlines
Deal found 2/5$519

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 February 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$451
(Kiwi.com)

One-way from

$262
(Expedia)

Popular in

December

Cheapest in

January

Average price

$750
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
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 6, 2026.
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 4/12

11:59 pm-3:40 pm

2 stops31h 41m

Porto

Fri 4/24

12:35 pm-11:44 am

3 stops31h 09m

$521

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 3/31

6:40 pm-10:05 pm

1 stop19h 25m

Porto

Tue 4/14

11:30 am-11:45 am

1 stop32h 15m

$549

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 3/30

6:40 pm-10:00 pm

1 stop19h 20m

Porto

Thu 4/16

5:00 am-11:45 am

1 stop14h 45m

$549

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 3/30

1:30 pm-10:00 pm

2 stops24h 30m

Porto

Wed 4/15

5:00 am-11:45 am

1 stop14h 45m

$553

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 3/30

3:30 pm-3:30 pm

2 stops16h 00m

Porto

Mon 4/13

7:00 pm-11:45 am

1 stop24h 45m

$559

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 4/18

6:40 pm-10:00 pm

1 stop19h 20m

Porto

Wed 4/29

5:00 am-4:30 pm

1 stop19h 30m

$582

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 3/4

1:25 pm-7:20 pm

1 stop21h 55m

Porto

Sun 3/8

5:00 am-11:25 am

1 stop14h 25m

$585

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 3/30

6:40 pm-10:00 pm

1 stop19h 20m

Porto

Tue 4/7

11:30 am-11:45 am

1 stop32h 15m

$618

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 3/31

5:30 pm-3:30 pm

1 stop14h 00m

Porto

Mon 4/6

7:00 pm-11:45 am

1 stop24h 45m

$623

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 3/31

7:20 am-6:20 pm

2 stops27h 00m

Porto

Tue 4/7

11:30 am-11:45 am

1 stop32h 15m

$627

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/5

Showing 1-10 of 31 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 $478). Flying from State of Washington to Porto in June is currently the most expensive (average of $782). 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.

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 United Airlines can get you from State of Washington to Porto in just under 14h 05m. Your travel time can differ by up to 21h 20m. 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 Delta. According to our data, you can fly for as low as $434. Users have also found prices from $451 and $487 on United Airlines and KLM, 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 $478). Flying from State of Washington to Porto in June is currently the most expensive (average of $782). 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
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

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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 4 airlines flying from Washington to Porto

Discover the top 4 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 February 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$490Average$1,007FlexibilityNo cancel feeOn-time75%
DeltaCheapest$580Average$939FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$588Average$929FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$594Average$924FlexibilityNo cancel feeOn-time69%

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