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Cheap flights from Washington to Porto from $367

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Porto departing on 3/9. 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 Washington to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:50 am - 11:40 pm
PDX
-
OPO
29h 50m2 stops
Multiple Airlines Logo
12:50 pm - 10:56 pm
OPO
-
PDX
42h 06m2 stops
$476Multiple Airlines
Fri, Feb 20 - Fri, Feb 27
Multiple Airlines Logo
12:35 pm - 6:35 pm
SEA
-
OPO
22h 00m2 stops
Multiple Airlines Logo
12:30 pm - 7:03 pm
OPO
-
SEA
38h 33m2 stops
$477Multiple Airlines
Sat, Feb 7 - Mon, Feb 23
KLM Logo
1:40 pm - 10:30 am
SEA
-
OPO
12h 50m1 stop
KLM Logo
5:00 am - 11:40 am
OPO
-
SEA
14h 40m1 stop
$478KLM
Tue, Jan 13 - Mon, Feb 2
Delta Logo
1:40 pm - 10:30 am
SEA
-
OPO
12h 50m1 stop
Delta Logo
11:15 am - 11:40 am
OPO
-
SEA
32h 25m1 stop
$479Delta
Sat, Feb 7 - Mon, Feb 23
Multiple Airlines Logo
2:10 pm - 10:30 am
SEA
-
OPO
36h 20m1 stop
Multiple Airlines Logo
9:55 am - 11:50 am
OPO
-
SEA
33h 55m1 stop
$480Multiple Airlines
Mon, Jan 12 - Tue, Jan 20
Multiple Airlines Logo
7:00 am - 10:25 am
PDX
-
OPO
19h 25m2 stops
Multiple Airlines Logo
5:00 am - 11:25 am
OPO
-
PDX
14h 25m1 stop
$482Multiple Airlines
Thu, Feb 5 - Fri, Feb 20
Delta Logo
6:00 am - 10:30 am
PDX
-
OPO
20h 30m2 stops
Delta Logo
5:00 am - 11:25 am
OPO
-
PDX
14h 25m1 stop
$483Delta
Wed, Jan 14 - Wed, Jan 21
Multiple Airlines Logo
9:25 am - 10:30 am
SEA
-
OPO
17h 05m2 stops
Multiple Airlines Logo
5:00 am - 11:40 am
OPO
-
SEA
14h 40m1 stop
$483Multiple Airlines
Tue, Jan 13 - Mon, Feb 2
KLM Logo
1:30 pm - 1:20 pm
PDX
-
OPO
15h 50m2 stops
KLM Logo
11:15 am - 11:25 am
OPO
-
PDX
32h 10m1 stop
$488KLM
Thu, Jan 15 - Tue, Jan 20
Air Canada Logo
8:10 am - 12:50 pm
SEA
-
OPO
20h 40m2 stops
Air Canada Logo
6:00 am - 10:16 pm
OPO
-
SEA
24h 16m2 stops
$492Air Canada
Tue, Jan 27 - Tue, Feb 3

Lufthansa flights from State of Washington to Porto

Our best Lufthansa deals on State of Washington to Porto flight tickets
Lufthansa
Jan 29
SEA2:00 pmSeattle/Tacoma Intl
16h 45m
1 stop
OPO2:45 pmPorto
Feb 5
OPO2:05 pmPorto
31h 15m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$460
Find similar
Lufthansa
Jan 29
SEA2:00 pmSeattle/Tacoma Intl
16h 45m
1 stop
OPO2:45 pmPorto
Feb 5
OPO2:05 pmPorto
31h 15m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$461
Find similar
Lufthansa
Jan 16
PDX7:45 amPortland
21h 05m
2 stops
OPO12:50 pmPorto
Jan 21
OPO12:30 pmPorto
38h 00m
2 stops
PDX6:30 pmPortland
$504
Find similar

KLM flights from State of Washington to Porto

Our best KLM deals on State of Washington to Porto flight tickets
KLM
Jan 13
SEA1:40 pmSeattle/Tacoma Intl
12h 50m
1 stop
OPO10:30 amPorto
Feb 2
OPO5:00 amPorto
14h 40m
1 stop
SEA11:40 amSeattle/Tacoma Intl
$478
Find similar
KLM
Jan 15
PDX1:30 pmPortland
15h 50m
2 stops
OPO1:20 pmPorto
Jan 20
OPO11:15 amPorto
32h 10m
1 stop
PDX11:25 amPortland
$488
Find similar
KLM
Jan 12
SEA7:10 amSeattle/Tacoma Intl
19h 20m
2 stops
OPO10:30 amPorto
Jan 20
OPO9:55 amPorto
33h 55m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$489
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from State of 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, momondo users made 832,500 searches. Data last updated December 15, 2025.
Use the filters below to find and compare flights from Washington to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandPorto

PDX - OPO

PDXOPO

Portland

Fri 2/20

9:50 am-11:40 pm

2 stops29h 50m

Porto

Fri 2/27

12:50 pm-10:56 pm

2 stops42h 06m

$476

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 2/7

12:35 pm-6:35 pm

2 stops22h 00m

Porto

Mon 2/23

12:30 pm-7:03 pm

2 stops38h 33m

$477

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/13

1:40 pm-10:30 am

1 stop12h 50m

Porto

Mon 2/2

5:00 am-11:40 am

1 stop14h 40m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 2/7

1:40 pm-10:30 am

1 stop12h 50m

Porto

Mon 2/23

11:15 am-11:40 am

1 stop32h 25m

$479

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 1/12

2:10 pm-10:30 am

1 stop36h 20m

Porto

Tue 1/20

9:55 am-11:50 am

1 stop33h 55m

$480

PortlandPorto

PDX - OPO

PDXOPO

Portland

Thu 2/5

7:00 am-10:25 am

2 stops19h 25m

Porto

Fri 2/20

5:00 am-11:25 am

1 stop14h 25m

$482

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 1/14

6:00 am-10:30 am

2 stops20h 30m

Porto

Wed 1/21

5:00 am-11:25 am

1 stop14h 25m

$483

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/13

9:25 am-10:30 am

2 stops17h 05m

Porto

Mon 2/2

5:00 am-11:40 am

1 stop14h 40m

$483

PortlandPorto

PDX - OPO

PDXOPO

Portland

Thu 1/15

1:30 pm-1:20 pm

2 stops15h 50m

Porto

Tue 1/20

11:15 am-11:25 am

1 stop32h 10m

$488

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/27

8:10 am-12:50 pm

2 stops20h 40m

Porto

Tue 2/3

6:00 am-10:16 pm

2 stops24h 16m

$492

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 Porto from

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

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 month to fly to Porto?

The month of October is, on average, the cheapest month to fly to Porto from State of Washington, with most prices found around $730. If you aren’t able to travel during the month of October, then book flights to Porto from State of Washington during March instead. Flights to Porto in March, while not as cheap as those in October, still average around $777.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Tuesday when prices can be found for as low as $1,008. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $1,286. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

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

In the evening is the cheapest time of day to fly from State of Washington to Porto when you can find flight prices for as low as $837. Flying to Porto in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $1,130 on average. Flights to Porto from State of Washington in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Porto?

You are more likely to see cheaper flights to Porto from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $1,040 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from State of Washington for as low as $739 on momondo.

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

You could potentially save up to 21% on your flight if you consider stops on a State of Washington to Porto flight.

Cheap State of Washington to Porto flight deals and tips

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

Fastest flight time

12h 50m

Direct flights

None
The fastest flight from State of Washington to Porto takes 12h 50m
There are no direct flights from State of Washington to Porto. There are no popular flight routes from State of Washington to Porto.
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  • When did momondo last update prices for flights from Washington to Porto Airport?

    Prices for flights from Washington to Porto Airport are updated daily.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington to Porto Airport.

  • What documentation or ID do you need to fly to Porto Airport?

    The travel and health documents you'll need for your trip to Porto Airport 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 Porto Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from State of Washington to Porto

Compare and see reviews for airlines that fly from State of Washington to Porto with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $591Free CancellationRating
7.9
8,008 reviews
Search Delta flights
LufthansaPriceFrom $619Free CancellationRating
6.8
7,628 reviews
Search Lufthansa flights
KLMPriceFrom $659Free CancellationRating
7.7
1,430 reviews
Search KLM flights
Turkish AirlinesPriceFrom $665Free CancellationRating
7.3
4,098 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $679Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Coimbra
Braga
Aveiro
Matosinhos
Guimarães
Esposende
Lamego
Chaves
Viseu
Espinho
Ponte de Lima
Arcos de Valdevez
Pinhao
Curia
Penafiel
Mesao Frio
Mira
Baiao

Why use momondo?

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

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

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

momondo does allow users to show only those flights to Porto from Washington which offer a flexible booking policy as well as other useful filters and features.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Washington to Porto.

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

Of course. momondo tracks the price of Washington to Porto 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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