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Cheap flights from Porto to Washington from $467

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Porto to Washington departing on 11/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Porto to Washington

Cheap round-trip flights

KLM Logo
8:20 pm - 11:50 amOPO-SEA
23h 30m1 stop
KLM Logo
1:30 pm - 3:30 pmSEA-OPO
18h 00m1 stop
$775KLM
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Thu, Oct 2 - Tue, Oct 7
Delta Logo
6:30 am - 4:05 pmOPO-SEA
17h 35m1 stop
Delta Logo
1:30 pm - 3:30 pmSEA-OPO
18h 00m1 stop
$776Delta
Find Deal
Thu, Oct 2 - Tue, Oct 7
Delta Logo
6:30 am - 10:06 pmOPO-SEA
23h 36m2 stops
Delta Logo
1:30 pm - 3:30 pmSEA-OPO
18h 00m1 stop
$781Delta
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Thu, Oct 2 - Tue, Oct 7
Delta Logo
6:30 am - 10:06 pmOPO-SEA
23h 36m2 stops
Delta Logo
1:30 pm - 3:30 pmSEA-OPO
18h 00m1 stop
$782Delta
Find Deal
Thu, Oct 2 - Tue, Oct 7
Multiple Airlines Logo
10:00 pm - 8:40 pmOPO-SEA
30h 40m3 stops
Multiple Airlines Logo
3:45 pm - 8:00 amSEA-OPO
32h 15m3 stops
$811Multiple Airlines
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Thu, Oct 2 - Tue, Oct 7
Multiple Airlines Logo
10:00 pm - 8:40 pmOPO-SEA
30h 40m3 stops
Multiple Airlines Logo
7:00 pm - 6:50 pmSEA-OPO
15h 50m2 stops
$812Multiple Airlines
Find Deal
Thu, Oct 2 - Tue, Oct 7
Lufthansa Logo
6:00 am - 11:55 amOPO-SEA
13h 55m1 stop
Lufthansa Logo
7:00 am - 10:20 amSEA-OPO
19h 20m2 stops
$832Lufthansa
Find Deal
Mon, Oct 13 - Mon, Oct 20
Lufthansa Logo
6:00 am - 11:55 amOPO-SEA
13h 55m1 stop
Lufthansa Logo
2:20 pm - 3:45 pmSEA-OPO
17h 25m1 stop
$835Lufthansa
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Mon, Oct 13 - Mon, Oct 20
United Airlines Logo
12:10 pm - 6:49 pmOPO-SEA
38h 39m2 stops
United Airlines Logo
8:00 am - 9:45 amSEA-OPO
17h 45m2 stops
$895United Airlines
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Mon, Oct 13 - Mon, Oct 20
American Airlines Logo
8:20 am - 11:18 pmOPO-SEA
22h 58m2 stops
American Airlines Logo
5:48 am - 7:40 amSEA-OPO
17h 52m2 stops
$3,824American Airlines
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Wed, Nov 12 - Sun, Nov 23

KLM flights from Porto to State of Washington

Our best KLM deals on Porto to State of Washington flight tickets
KLM
Oct 2
OPO8:20 pmPorto
23h 30m
1 stop
SEA11:50 amSeattle/Tacoma Intl
Oct 7
SEA1:30 pmSeattle/Tacoma Intl
18h 00m
1 stop
OPO3:30 pmPorto
$775
Find similar
KLM
Oct 13
OPO4:20 pmPorto
33h 20m
1 stop
SEA5:40 pmSeattle/Tacoma Intl
Oct 20
SEA1:30 pmSeattle/Tacoma Intl
18h 00m
1 stop
OPO3:30 pmPorto
$792
Find similar
KLM
Sep 26
OPO4:20 pmPorto
33h 20m
1 stop
SEA5:40 pmSeattle/Tacoma Intl
Sep 30
SEA1:30 pmSeattle/Tacoma Intl
18h 00m
1 stop
OPO3:30 pmPorto
$851
Find similar

Delta flights from Porto to State of Washington

Our best Delta deals on Porto to State of Washington flight tickets
Delta
Sep 26
OPO6:40 amPorto
17h 25m
1 stop
SEA4:05 pmSeattle/Tacoma Intl
Sep 30
SEA1:30 pmSeattle/Tacoma Intl
18h 00m
1 stop
OPO3:30 pmPorto
$775
Find similar
Delta
Oct 2
OPO6:30 amPorto
17h 35m
1 stop
SEA4:05 pmSeattle/Tacoma Intl
Oct 7
SEA1:30 pmSeattle/Tacoma Intl
18h 00m
1 stop
OPO3:30 pmPorto
$776
Find similar
Delta
Sep 25
OPO6:30 amPorto
17h 35m
1 stop
SEA4:05 pmSeattle/Tacoma Intl
Sep 30
SEA11:25 amSeattle/Tacoma Intl
20h 05m
2 stops
OPO3:30 pmPorto
$780
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Porto to State of 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, momondo users made 832,500 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from Porto to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/2

8:20 pm-11:50 am

1 stop23h 30m

Seattle/Tacoma Intl

Tue 10/7

1:30 pm-3:30 pm

1 stop18h 00m

$775

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/2

6:30 am-4:05 pm

1 stop17h 35m

Seattle/Tacoma Intl

Tue 10/7

1:30 pm-3:30 pm

1 stop18h 00m

$776

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/2

6:30 am-10:06 pm

2 stops23h 36m

Seattle/Tacoma Intl

Tue 10/7

1:30 pm-3:30 pm

1 stop18h 00m

$781

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/2

6:30 am-10:06 pm

2 stops23h 36m

Seattle/Tacoma Intl

Tue 10/7

1:30 pm-3:30 pm

1 stop18h 00m

$782

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/2

10:00 pm-8:40 pm

3 stops30h 40m

Seattle/Tacoma Intl

Tue 10/7

3:45 pm-8:00 am

3 stops32h 15m

$811

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/2

10:00 pm-8:40 pm

3 stops30h 40m

Seattle/Tacoma Intl

Tue 10/7

7:00 pm-6:50 pm

2 stops15h 50m

$812

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 10/13

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Mon 10/20

7:00 am-10:20 am

2 stops19h 20m

$832

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 10/13

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Mon 10/20

2:20 pm-3:45 pm

1 stop17h 25m

$835

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 10/13

12:10 pm-6:49 pm

2 stops38h 39m

Seattle/Tacoma Intl

Mon 10/20

8:00 am-9:45 am

2 stops17h 45m

$895

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 11/12

8:20 am-11:18 pm

2 stops22h 58m

Seattle/Tacoma Intl

Sun 11/23

5:48 am-7:40 am

2 stops17h 52m

$3,824

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington from

How to get the cheapest flight ticket from Porto to State of Washington

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to State of Washington?

The cheapest day to depart from Porto to State of Washington is on a Monday. Travelers who choose to depart for State of Washington on a Monday will often find tickets for as low as $792. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Porto to State of Washington for around $1,114.

What is the cheapest time of day to depart on your flight to State of Washington?

The cheapest time of day to fly to State of Washington is in the afternoon when flights can be purchased for as low as $792. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $934 on average. Flights to State of Washington from Porto in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

Can stopping save me money on Porto to State of Washington flights?

You could potentially save up to 2% on your flight if you consider stops on a Porto to State of Washington flight.

Cheap Porto to State of Washington flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Porto to State of Washington

Direct flights

None
There are no direct flights from Porto to State of Washington. There are no popular flight routes from Porto to State of Washington.
Search flight deals

  • When did momondo last update prices for flights from Porto Airport to Washington?

    Prices for flights from Porto Airport to Washington are refreshed on a daily basis.

  • How many operators does momondo search for flights from Porto Airport to Washington?

  • How old do you have to be to fly from Porto Airport to Washington?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Porto Airport to Washington.

  • What documentation or ID do you need to fly to Washington?

    The travel and health documents you'll need for your trip to Washington may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Washington. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Porto to State of Washington

Compare and see reviews for airlines that fly from Porto to State of Washington with momondo
Airline
Rating
Free Cancellation
Price
KLMPriceFrom $794Free CancellationRating
7.8
1,386 reviews
Search KLM flights

Why use momondo?

Why should I use momondo to find a flight deal from Porto to Washington?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Porto to Washington. momondo saves you time and could save you money on your trip.

Can I find flights from Porto to Washington with flexible booking policies on momondo?

Yes. All flights to Washington from Porto on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Porto to Washington?

momondo provides multiple filters to help you find the best flight to Washington from Porto. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Porto to Washington right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Porto to Washington flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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