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$434+ 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 4/12. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SEA
Mar 7 — Mar 141
Sat 3/7
Sat 3/14
1 adult, Economy
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Cheap 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 February 5, 2026.

This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/146:15 am
OPO
-
SEA
2 stops17h 25m
Multiple Airlines
Tue 3/243:35 pm
SEA
-
OPO
2 stops23h 10m
Multiple Airlines
Deal found 2/5$836
This Delta deal was found by Cheapflights users on 2/2. 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.
Mon 2/165:00 am
OPO
-
SEA
1 stop14h 40m
Delta
Tue 2/241:40 pm
SEA
-
OPO
1 stop12h 50m
Delta
Deal found 2/2$862
This Delta deal was found by Cheapflights users on 2/2. 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.
Sun 3/15:00 am
OPO
-
SEA
2 stops20h 00m
Delta
Sun 3/87:20 am
SEA
-
OPO
2 stops20h 10m
Delta
Deal found 2/2$868
This Mytrip deal was found by Cheapflights users on 2/2. 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.
Sun 3/16:00 pm
OPO
-
SEA
3 stops31h 00m
Multiple Airlines
Sun 3/83:00 pm
SEA
-
OPO
2 stops25h 45m
Multiple Airlines
Deal found 2/2$870
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/199:45 pm
OPO
-
SEA
2 stops32h 08m
Multiple Airlines
Sat 4/257:00 pm
SEA
-
OPO
3 stops18h 20m
Multiple Airlines
Deal found 2/4$878
This KLM 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/205:00 am
OPO
-
SEA
1 stop14h 35m
KLM
Fri 3/274:05 pm
SEA
-
OPO
1 stop34h 50m
KLM
Deal found 2/3$887
This Air Canada 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:00 am
OPO
-
SEA
2 stops35h 33m
Air Canada
Sun 4/198:00 pm
SEA
-
OPO
2 stops35h 40m
Air Canada
Deal found 2/3$894
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 4/156:00 am
OPO
-
SEA
2 stops21h 00m
United Airlines
Sun 4/1912:08 pm
SEA
-
OPO
1 stop13h 37m
United Airlines
Deal found 2/3$895

Find flight deals from Porto to Washington

Keep the following information in mind while searching for Porto to Washington flight deals. Data was last updated February 5, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$836
(Mytrip)

One-way from

$434
(Kiwi.com)

Popular in

July

Cheapest in

April
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. 9% potential increase in price ($101 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($43 potential savings vs. average RT price).
Search Deals

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 February 5, 2026.
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

Sun 4/19

9:45 pm-9:33 am

3 stops43h 48m

Seattle/Tacoma Intl

Sat 4/25

7:00 pm-9:20 pm

3 stops18h 20m

$836

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 3/14

8:50 am-10:16 pm

1 stop20h 26m

Seattle/Tacoma Intl

Tue 3/24

3:35 pm-9:45 pm

2 stops23h 10m

$861

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 2/16

4:10 pm-11:40 am

1 stop27h 30m

Seattle/Tacoma Intl

Tue 2/24

1:40 pm-10:30 am

1 stop12h 50m

$862

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 2/16

5:00 am-11:40 am

1 stop14h 40m

Seattle/Tacoma Intl

Tue 2/24

6:00 am-10:30 am

2 stops20h 30m

$862

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 2/16

5:00 am-11:40 am

1 stop14h 40m

Seattle/Tacoma Intl

Tue 2/24

8:30 am-10:30 am

2 stops18h 00m

$862

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 3/1

5:00 am-11:35 am

1 stop14h 35m

Seattle/Tacoma Intl

Sun 3/8

4:05 pm-10:25 pm

1 stop23h 20m

$868

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 3/20

5:00 am-12:35 pm

1 stop14h 35m

Seattle/Tacoma Intl

Fri 3/27

4:05 pm-9:55 am

1 stop34h 50m

$887

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 4/15

6:00 am-7:00 pm

2 stops21h 00m

Seattle/Tacoma Intl

Sun 4/19

12:08 pm-9:45 am

1 stop13h 37m

$895

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 4/12

10:20 pm-7:25 pm

3 stops53h 05m

$434

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 5/12

10:00 pm-7:19 pm

3 stops29h 19m

$444

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/4

Showing 1-10 of 17 results
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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
No data available for this route at this time. Please check back soon.

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.

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

    There are many flights that can get you from Porto to State of Washington in 14h 40m. Fly via KLM or Delta to get the fastest option. The distance from Porto to State of Washington is about 5083 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    To fly one-way, consider booking your trip with Delta, which is currently one of the cheapest options available, starting at $716. Lufthansa flights start at $724 while deals on KLM start at $726 one-way.

  • 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.

See more FAQs

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