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Cheap flights from Seattle to Porto from $432

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Porto departing on 1/12. 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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Find the cheapest flights from Seattle to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
2:00 pm - 2:55 pmSEA-OPO
16h 55m1 stop
Lufthansa Logo
6:00 am - 10:43 pmOPO-SEA
24h 43m2 stops
$432Lufthansa
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Mon, Jan 12 - Sun, Jan 25
Multiple Airlines Logo
12:35 pm - 6:30 pmSEA-OPO
21h 55m2 stops
Multiple Airlines Logo
2:05 pm - 1:20 pmOPO-SEA
31h 15m1 stop
$450Multiple Airlines
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Thu, Jan 8 - Thu, Jan 15
Iberia Logo
6:00 am - 7:40 amSEA-OPO
17h 40m2 stops
Iberia Logo
8:20 am - 11:07 pmOPO-SEA
22h 47m2 stops
$459Iberia
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Sun, Feb 1 - Tue, Mar 3
Lufthansa Logo
3:10 pm - 12:50 pmSEA-OPO
13h 40m1 stop
Lufthansa Logo
6:00 am - 6:14 pmOPO-SEA
20h 14m2 stops
$463Lufthansa
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Fri, Jan 30 - Tue, Feb 10
Delta Logo
1:40 pm - 10:30 amSEA-OPO
12h 50m1 stop
Delta Logo
11:15 am - 11:40 amOPO-SEA
32h 25m1 stop
$464Delta
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Tue, Jan 27 - Tue, Feb 10
Delta Logo
1:40 pm - 10:30 amSEA-OPO
12h 50m1 stop
Delta Logo
11:15 am - 11:40 amOPO-SEA
32h 25m1 stop
$465Delta
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Tue, Jan 27 - Thu, Feb 12
Delta Logo
2:10 pm - 10:25 amSEA-OPO
36h 15m1 stop
Delta Logo
6:35 am - 11:40 amOPO-SEA
37h 05m1 stop
$466Delta
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Wed, Jan 28 - Thu, Feb 12
Delta Logo
2:15 pm - 10:30 amSEA-OPO
36h 15m1 stop
Delta Logo
11:15 am - 11:40 amOPO-SEA
32h 25m1 stop
$467Delta
Find Deal
Mon, Feb 2 - Mon, Feb 9
Delta Logo
2:15 pm - 10:30 amSEA-OPO
36h 15m1 stop
Delta Logo
11:15 am - 11:40 amOPO-SEA
32h 25m1 stop
$468Delta
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Mon, Feb 2 - Mon, Feb 9
Delta Logo
2:10 pm - 10:25 amSEA-OPO
36h 15m1 stop
Delta Logo
11:15 am - 11:40 amOPO-SEA
32h 25m1 stop
$469Delta
Find Deal
Wed, Jan 28 - Sun, Feb 8

Lufthansa flights from Seattle to Porto

Our best Lufthansa deals on Seattle to Porto flight tickets
Lufthansa
Jan 12
SEA2:00 pmSeattle/Tacoma Intl
16h 55m
1 stop
OPO2:55 pmPorto
Jan 25
OPO6:00 amPorto
24h 43m
2 stops
SEA10:43 pmSeattle/Tacoma Intl
$432
Find similar
Lufthansa
Jan 30
SEA3:10 pmSeattle/Tacoma Intl
13h 40m
1 stop
OPO12:50 pmPorto
Feb 10
OPO6:00 amPorto
20h 14m
2 stops
SEA6:14 pmSeattle/Tacoma Intl
$463
Find similar
Lufthansa
Jan 28
SEA3:10 pmSeattle/Tacoma Intl
14h 05m
1 stop
OPO1:15 pmPorto
Feb 7
OPO1:45 pmPorto
31h 35m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$490
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Scandinavian Airlines flights from Seattle to Porto

Our best Scandinavian Airlines deals on Seattle to Porto flight tickets
Scandinavian Airlines
Mar 5
SEA7:10 amSeattle/Tacoma Intl
25h 45m
2 stops
OPO4:55 pmPorto
Mar 9
OPO5:35 pmPorto
35h 45m
2 stops
SEA10:20 pmSeattle/Tacoma Intl
$507
Find similar
Scandinavian Airlines
Dec 3
SEA12:45 pmSeattle/Tacoma Intl
44h 10m
2 stops
OPO4:55 pmPorto
Dec 12
OPO5:35 pmPorto
33h 25m
2 stops
SEA7:00 pmSeattle/Tacoma Intl
$1,218
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momondo Fare Finder

 
Customize your flight search to find flights from Seattle 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 November 26, 2025.
Use the filters below to find and compare flights from Seattle to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 1/12

2:00 pm-2:55 pm

1 stop16h 55m

Porto

Sun 1/25

6:00 am-10:43 pm

2 stops24h 43m

$432

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 1/8

12:35 pm-6:30 pm

2 stops21h 55m

Porto

Thu 1/15

2:05 pm-1:20 pm

1 stop31h 15m

$450

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 2/1

6:00 am-7:40 am

2 stops17h 40m

Porto

Tue 3/3

8:20 am-11:07 pm

2 stops22h 47m

$459

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fri 1/30

3:10 pm-12:50 pm

1 stop13h 40m

Porto

Tue 2/10

6:00 am-6:14 pm

2 stops20h 14m

$463

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/27

1:40 pm-10:30 am

1 stop12h 50m

Porto

Tue 2/10

11:15 am-11:40 am

1 stop32h 25m

$464

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/27

1:40 pm-10:30 am

1 stop12h 50m

Porto

Thu 2/12

11:15 am-11:40 am

1 stop32h 25m

$465

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 1/28

2:10 pm-10:25 am

1 stop36h 15m

Porto

Thu 2/12

6:35 am-11:40 am

1 stop37h 05m

$466

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 2/2

2:15 pm-10:30 am

1 stop36h 15m

Porto

Mon 2/9

11:15 am-11:40 am

1 stop32h 25m

$467

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 2/2

2:15 pm-10:30 am

1 stop36h 15m

Porto

Mon 2/9

11:15 am-11:40 am

1 stop32h 25m

$468

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 1/28

2:10 pm-10:25 am

1 stop36h 15m

Porto

Sun 2/8

11:15 am-11:40 am

1 stop32h 25m

$469

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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See travel insights to Porto from

How to get the cheapest flight ticket from Seattle 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 Seattle, with most prices found around $730. If you aren’t able to travel during the month of October, then book flights to Porto from Seattle 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 Seattle 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 Seattle 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 Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $1,042 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from Seattle for as low as $741 on momondo.

Can stopping save me money on Seattle to Porto flights?

You could potentially save up to 7% on your flight if you consider stops on a Seattle to Porto flight.

How have Seattle to Porto flight prices changed over time?

As of November 2025, prices for Seattle to Porto flights are approximately 86% more expensive when compared to flights at the same time last year.

When to book flights from Seattle to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Porto according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Porto (SEA to OPO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Porto

Fastest flight time

12h 50m

Direct flights

None
The fastest flight from Seattle to Porto takes 12h 50m
There are no direct flights from Seattle to Porto. There are no popular flight routes from Seattle to Porto.
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  • How far is Seattle/Tacoma Intl to Porto by plane?

    Seattle/Tacoma Intl and Porto are 5083.1 mi apart from one another. Typically, this will take 12h 50m by plane in normal conditions.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Porto Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Porto Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Porto Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Porto Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport 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.

  • What is the most popular airline from Seattle to Porto?

Best airlines flying from Seattle to Porto

Compare and see reviews for airlines that fly from Seattle to Porto with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $619Free CancellationRating
6.8
7,594 reviews
Search Lufthansa flights
KLMPriceFrom $659Free CancellationRating
7.7
1,422 reviews
Search KLM flights
DeltaPriceFrom $659Free CancellationRating
7.9
7,998 reviews
Search Delta flights
United AirlinesPriceFrom $679Free CancellationRating
7.4
9,046 reviews
Search United Airlines flights
Turkish AirlinesPriceFrom $685Free CancellationRating
7.3
4,059 reviews
Search Turkish 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
Aveiro
Braga
Matosinhos
Guimarães
Lamego
Esposende
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 Seattle to Porto?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Porto from Seattle.

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

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

How can momondo help me find flights from Seattle 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 Seattle to Porto.

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

If you are simply researching potential flights to Porto, momondo offers a useful price alert feature which will track prices for flights to Porto from Seattle and alert you when they change.

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