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Cheap flights from Washington to Porto from $305

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 12/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
3:10 pm - 11:40 pmSEA-OPO
24h 30m1 stop
Lufthansa Logo
6:15 am - 1:20 pmOPO-SEA
15h 05m1 stop
$500Lufthansa
Find Deal
Fri, Nov 14 - Sun, Nov 23
Multiple Airlines Logo
3:10 pm - 11:40 pmSEA-OPO
24h 30m1 stop
Multiple Airlines Logo
6:15 am - 7:16 pmOPO-SEA
21h 01m2 stops
$503Multiple Airlines
Find Deal
Fri, Nov 14 - Sun, Nov 23
KLM Logo
9:59 am - 10:30 amPDX-OPO
16h 31m2 stops
KLM Logo
5:00 am - 11:25 amOPO-PDX
14h 25m1 stop
$531KLM
Find Deal
Wed, Nov 12 - Sun, Nov 16
KLM Logo
1:25 pm - 10:30 amPDX-OPO
13h 05m1 stop
KLM Logo
5:00 am - 11:25 amOPO-PDX
14h 25m1 stop
$532KLM
Find Deal
Wed, Nov 12 - Sun, Nov 16
Delta Logo
1:25 pm - 10:30 amPDX-OPO
13h 05m1 stop
Delta Logo
11:15 am - 11:25 amOPO-PDX
32h 10m1 stop
$533Delta
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Wed, Nov 12 - Sun, Dec 7
Delta Logo
1:40 pm - 10:30 amSEA-OPO
12h 50m1 stop
Delta Logo
6:00 am - 8:32 pmOPO-SEA
22h 32m2 stops
$537Delta
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Sat, Jan 31 - Sat, Feb 21
United Airlines Logo
7:00 am - 9:30 amSEA-OPO
18h 30m2 stops
United Airlines Logo
6:00 am - 10:59 pmOPO-SEA
24h 59m2 stops
$538United Airlines
Find Deal
Sat, Feb 21 - Sat, Feb 28
United Airlines Logo
7:00 am - 9:30 amPDX-OPO
18h 30m2 stops
United Airlines Logo
6:00 am - 10:52 pmOPO-PDX
24h 52m2 stops
$538United Airlines
Find Deal
Wed, Nov 12 - Wed, Dec 10
British Airways Logo
5:45 pm - 8:00 pmPDX-OPO
42h 15m2 stops
British Airways Logo
12:25 pm - 11:32 pmOPO-PDX
43h 07m2 stops
$586British Airways
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Mon, Jan 5 - Wed, Jan 21
British Airways Logo
12:49 am - 4:00 pmPDX-OPO
31h 11m2 stops
British Airways Logo
8:40 pm - 1:21 pmOPO-PDX
24h 41m2 stops
$706British Airways
Find Deal
Sun, Jan 4 - Wed, Jan 21

KLM flights from State of Washington to Porto

Our best KLM deals on State of Washington to Porto flight tickets
KLM
Nov 12
PDX9:59 amPortland
16h 31m
2 stops
OPO10:30 amPorto
Nov 16
OPO5:00 amPorto
14h 25m
1 stop
PDX11:25 amPortland
$531
Find similar
KLM
Nov 12
PDX1:25 pmPortland
13h 05m
1 stop
OPO10:30 amPorto
Nov 16
OPO5:00 amPorto
14h 25m
1 stop
PDX11:25 amPortland
$532
Find similar
KLM
Nov 5
PDX9:58 amPortland
16h 32m
2 stops
OPO10:30 amPorto
Nov 12
OPO6:00 amPorto
24h 05m
2 stops
PDX10:05 pmPortland
$541
Find similar

United Airlines flights from State of Washington to Porto

Our best United Airlines deals on State of Washington to Porto flight tickets
United Airlines
Feb 21
SEA7:00 amSeattle/Tacoma Intl
18h 30m
2 stops
OPO9:30 amPorto
Feb 28
OPO6:00 amPorto
24h 59m
2 stops
SEA10:59 pmSeattle/Tacoma Intl
$538
Find similar
United Airlines
Dec 9
PDX7:00 amPortland
23h 45m
2 stops
OPO2:45 pmPorto
Dec 16
OPO12:30 pmPorto
20h 07m
2 stops
PDX12:37 amPortland
$553
Find similar
United Airlines
Feb 3
SEA9:25 amSeattle/Tacoma Intl
42h 15m
3 stops
OPO11:40 amPorto
Feb 21
OPO6:00 amPorto
22h 56m
2 stops
SEA8:56 pmSeattle/Tacoma Intl
$565
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 October 9, 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

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fri 11/14

3:10 pm-11:40 pm

1 stop24h 30m

Porto

Sun 11/23

6:15 am-1:20 pm

1 stop15h 05m

$500

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fri 11/14

3:10 pm-11:40 pm

1 stop24h 30m

Porto

Sun 11/23

6:15 am-7:16 pm

2 stops21h 01m

$503

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/12

9:59 am-10:30 am

2 stops16h 31m

Porto

Sun 11/16

5:00 am-11:25 am

1 stop14h 25m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/12

1:25 pm-10:30 am

1 stop13h 05m

Porto

Sun 11/16

5:00 am-11:25 am

1 stop14h 25m

$532

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/12

1:25 pm-10:30 am

1 stop13h 05m

Porto

Sun 12/7

11:15 am-11:25 am

1 stop32h 10m

$533

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 1/31

1:40 pm-10:30 am

1 stop12h 50m

Porto

Sat 2/21

6:00 am-8:32 pm

2 stops22h 32m

$537

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 2/21

7:00 am-9:30 am

2 stops18h 30m

Porto

Sat 2/28

6:00 am-10:59 pm

2 stops24h 59m

$538

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/12

7:00 am-9:30 am

2 stops18h 30m

Porto

Wed 12/10

6:00 am-10:52 pm

2 stops24h 52m

$538

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 1/5

5:45 pm-8:00 pm

2 stops42h 15m

Porto

Wed 1/21

12:25 pm-11:32 pm

2 stops43h 07m

$586

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 1/4

12:49 am-4:00 pm

2 stops31h 11m

Porto

Wed 1/21

8:40 pm-1:21 pm

2 stops24h 41m

$706

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 $732. 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 $790.

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 $1,020 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 $775 on momondo.

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

You could potentially save up to 6% 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

Direct flights

None
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 $647Free CancellationRating
7.9
7,969 reviews
Search Delta flights
KLMPriceFrom $659Free CancellationRating
7.7
1,399 reviews
Search KLM flights
Turkish AirlinesPriceFrom $685Free CancellationRating
7.3
3,995 reviews
Search Turkish Airlines flights
LufthansaPriceFrom $693Free CancellationRating
6.8
7,462 reviews
Search Lufthansa flights
United AirlinesPriceFrom $707Free CancellationRating
7.4
8,968 reviews
Search United Airlines flights
British AirwaysPriceFrom $741Free CancellationRating
6.7
7,446 reviews
Search British Airways 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
Aveiro
Braga
Matosinhos
Caminha
Esposende
Lamego
Guimarães
Chaves
Espinho
Viseu
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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