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Cheap flights from Seattle to Porto from $296

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Porto departing on 4/17. 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 Seattle to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:00 am - 6:30 pm
SEA
-
OPO
26h 30m
2 stops
Multiple Airlines Logo
6:15 am - 1:20 pm
OPO
-
SEA
15h 05m
1 stop
$461Multiple Airlines
Sun, Feb 22 - Sun, Mar 1
Multiple Airlines Logo
8:00 am - 6:30 pm
SEA
-
OPO
26h 30m
2 stops
Multiple Airlines Logo
6:15 am - 1:20 pm
OPO
-
SEA
15h 05m
1 stop
$466Multiple Airlines
Sun, Feb 22 - Sun, Mar 1
Multiple Airlines Logo
8:00 am - 6:30 pm
SEA
-
OPO
26h 30m
2 stops
Multiple Airlines Logo
1:45 pm - 1:20 pm
OPO
-
SEA
31h 35m
1 stop
$478Multiple Airlines
Tue, Feb 24 - Tue, Mar 3
KLM Logo
1:40 pm - 10:30 am
SEA
-
OPO
12h 50m
1 stop
KLM Logo
11:15 am - 11:35 am
OPO
-
SEA
32h 20m
1 stop
$479KLM
Tue, Feb 24 - Tue, Mar 3
Multiple Airlines Logo
8:00 am - 6:30 pm
SEA
-
OPO
26h 30m
2 stops
Multiple Airlines Logo
1:45 pm - 1:20 pm
OPO
-
SEA
31h 35m
1 stop
$481Multiple Airlines
Tue, Feb 24 - Tue, Mar 3
Delta Logo
1:45 pm - 10:30 pm
SEA
-
OPO
24h 45m
2 stops
Delta Logo
5:00 am - 4:30 pm
OPO
-
SEA
19h 30m
1 stop
$482Delta
Mon, Apr 13 - Thu, Apr 23
Multiple Airlines Logo
7:30 am - 10:30 am
SEA
-
OPO
19h 00m
2 stops
Multiple Airlines Logo
9:55 am - 12:35 pm
OPO
-
SEA
33h 40m
1 stop
$483Multiple Airlines
Tue, Mar 3 - Tue, Mar 10
Lufthansa Logo
3:10 pm - 11:40 pm
SEA
-
OPO
24h 30m
1 stop
Lufthansa Logo
6:00 am - 7:03 pm
OPO
-
SEA
20h 03m
2 stops
$484Lufthansa
Wed, Mar 4 - Thu, Mar 12
KLM Logo
3:05 pm - 10:25 pm
SEA
-
OPO
23h 20m
1 stop
KLM Logo
11:15 am - 11:35 am
OPO
-
SEA
32h 20m
1 stop
$485KLM
Tue, Feb 24 - Tue, Mar 3
KLM Logo
3:05 pm - 3:25 pm
SEA
-
OPO
16h 20m
1 stop
KLM Logo
5:00 am - 11:35 am
OPO
-
SEA
14h 35m
1 stop
$486KLM
Tue, Feb 24 - Tue, Mar 3

KLM flights from Seattle to Porto

Our best KLM deals on Seattle to Porto flight tickets
KLM
Feb 24
SEA1:40 pmSeattle/Tacoma Intl
12h 50m
1 stop
OPO10:30 amPorto
Mar 3
OPO11:15 amPorto
32h 20m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$479
KLM
Feb 24
SEA3:05 pmSeattle/Tacoma Intl
23h 20m
1 stop
OPO10:25 pmPorto
Mar 3
OPO11:15 amPorto
32h 20m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$485
KLM
Feb 24
SEA3:05 pmSeattle/Tacoma Intl
16h 20m
1 stop
OPO3:25 pmPorto
Mar 3
OPO5:00 amPorto
14h 35m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$486

United Airlines flights from Seattle to Porto

Our best United Airlines deals on Seattle to Porto flight tickets
United Airlines
Feb 24
SEA9:00 amSeattle/Tacoma Intl
16h 30m
2 stops
OPO9:30 amPorto
Mar 3
OPO12:30 pmPorto
20h 29m
2 stops
SEA12:59 amSeattle/Tacoma Intl
$487
United Airlines
Feb 24
SEA9:00 amSeattle/Tacoma Intl
16h 30m
2 stops
OPO9:30 amPorto
Mar 3
OPO12:30 pmPorto
20h 29m
2 stops
SEA12:59 amSeattle/Tacoma Intl
$488
United Airlines
Mar 4
SEA10:55 amSeattle/Tacoma Intl
40h 45m
2 stops
OPO11:40 amPorto
Mar 9
OPO12:35 pmPorto
17h 18m
1 stop
SEA10:53 pmSeattle/Tacoma Intl
$521

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 January 28, 2026.
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

Sun 2/22

8:00 am-6:30 pm

2 stops26h 30m

Porto

Sun 3/1

6:15 am-1:20 pm

1 stop15h 05m

$461

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 2/22

8:00 am-6:30 pm

2 stops26h 30m

Porto

Sun 3/1

6:15 am-1:20 pm

1 stop15h 05m

$466

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

8:00 am-6:30 pm

2 stops26h 30m

Porto

Tue 3/3

1:45 pm-1:20 pm

1 stop31h 35m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

1:40 pm-10:30 am

1 stop12h 50m

Porto

Tue 3/3

11:15 am-11:35 am

1 stop32h 20m

$479

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

8:00 am-6:30 pm

2 stops26h 30m

Porto

Tue 3/3

1:45 pm-1:20 pm

1 stop31h 35m

$481

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 4/13

1:45 pm-10:30 pm

2 stops24h 45m

Porto

Thu 4/23

5:00 am-4:30 pm

1 stop19h 30m

$482

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 3/3

7:30 am-10:30 am

2 stops19h 00m

Porto

Tue 3/10

9:55 am-12:35 pm

1 stop33h 40m

$483

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 3/4

3:10 pm-11:40 pm

1 stop24h 30m

Porto

Thu 3/12

6:00 am-7:03 pm

2 stops20h 03m

$484

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

3:05 pm-10:25 pm

1 stop23h 20m

Porto

Tue 3/3

11:15 am-11:35 am

1 stop32h 20m

$485

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

3:05 pm-3:25 pm

1 stop16h 20m

Porto

Tue 3/3

5:00 am-11:35 am

1 stop14h 35m

$486

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 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 January is, on average, the cheapest month to fly to Porto from Seattle, with most prices found around $485. If you aren’t able to travel during the month of January, then book flights to Porto from Seattle during March instead. Flights to Porto in March, while not as cheap as those in January, still average around $697.

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 $950 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 $730 on momondo.

Can stopping save me money on Seattle to Porto flights?

You could potentially save up to 25% on your flight if you consider stops on a Seattle to Porto flight.

How have Seattle to Porto flight prices changed over time?

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

13h 40m

Direct flights

None
The fastest flight from Seattle to Porto takes 13h 40m
There are no direct flights from Seattle to Porto. There are no popular flight routes from Seattle to Porto.
Search flight deals

  • 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 13h 40m 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
KLMPriceFrom $490Free CancellationRating
7.7
1,443 reviews
Search KLM flights
DeltaPriceFrom $580Free CancellationRating
7.9
8,120 reviews
Search Delta flights
LufthansaPriceFrom $588Free CancellationRating
6.8
7,749 reviews
Search Lufthansa flights
United AirlinesPriceFrom $664Free CancellationRating
7.4
9,205 reviews
Search United Airlines flights
Turkish AirlinesPriceFrom $665Free CancellationRating
7.3
4,209 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
Braga
Aveiro
Matosinhos
Esposende
Lamego
Guimarães
Espinho
Chaves
Pinhao
Arcos de Valdevez
Ponte de Lima
Viseu
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.

An easier way to manage your Porto trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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