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Cheap flights from Seattle to Porto from $304

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 8/5. 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
1 adult, Economy, 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.
Scandinavian Airlines Logo
3:55 pm - 5:05 pm
SEA
-
OPO
17h 10m
1 stop
Scandinavian Airlines Logo
5:55 pm - 1:45 pm
OPO
-
SEA
27h 50m
1 stop
$687Scandinavian Airlines
Sat, Sep 5 - Fri, Sep 11
Scandinavian Airlines Logo
3:55 pm - 5:05 pm
SEA
-
OPO
17h 10m
1 stop
Scandinavian Airlines Logo
11:50 am - 1:45 pm
OPO
-
SEA
33h 55m
1 stop
$738Scandinavian Airlines
Sat, Sep 5 - Thu, Sep 10
Multiple Airlines Logo
3:40 pm - 5:50 pm
SEA
-
OPO
18h 10m
2 stops
Multiple Airlines Logo
6:00 pm - 9:40 am
OPO
-
SEA
47h 40m
3 stops
$740Multiple Airlines
Tue, Aug 18 - Mon, Aug 24
Multiple Airlines Logo
7:00 pm - 8:00 am
SEA
-
OPO
29h 00m
3 stops
Multiple Airlines Logo
6:00 pm - 9:40 am
OPO
-
SEA
47h 40m
3 stops
$751Multiple Airlines
Tue, Aug 18 - Mon, Aug 24
Scandinavian Airlines Logo
3:55 pm - 5:05 pm
SEA
-
OPO
17h 10m
1 stop
Scandinavian Airlines Logo
5:55 pm - 1:45 pm
OPO
-
SEA
27h 50m
1 stop
$757Scandinavian Airlines
Sat, Sep 26 - Fri, Oct 9
Multiple Airlines Logo
8:00 am - 12:40 am
SEA
-
OPO
32h 40m
3 stops
Multiple Airlines Logo
7:10 pm - 6:32 pm
OPO
-
SEA
31h 22m
3 stops
$775Multiple Airlines
Sat, Sep 5 - Sat, Sep 12
British Airways Logo
1:30 pm - 8:35 pm
SEA
-
OPO
23h 05m
1 stop
British Airways Logo
8:20 am - 12:14 am
OPO
-
SEA
23h 54m
2 stops
$795British Airways
Sun, Oct 11 - Wed, Oct 21
American Airlines Logo
12:00 pm - 4:00 pm
SEA
-
OPO
20h 00m
2 stops
American Airlines Logo
8:20 am - 7:30 pm
OPO
-
SEA
19h 10m
2 stops
$798American Airlines
Sun, Oct 11 - Wed, Oct 21
American Airlines Logo
12:57 pm - 4:00 pm
SEA
-
OPO
19h 03m
2 stops
American Airlines Logo
8:20 am - 7:30 pm
OPO
-
SEA
19h 10m
2 stops
$799American Airlines
Mon, Oct 5 - Thu, Oct 15
Multiple Airlines Logo
1:30 pm - 7:05 pm
SEA
-
OPO
21h 35m
1 stop
Multiple Airlines Logo
8:40 pm - 7:30 pm
OPO
-
SEA
30h 50m
2 stops
$812Multiple Airlines
Wed, Oct 7 - Mon, Oct 19

Scandinavian Airlines flights from Seattle to Porto

Our best Scandinavian Airlines deals on Seattle to Porto flight tickets
Scandinavian Airlines
Sep 5
SEA3:55 pmSeattle/Tacoma Intl
17h 10m
1 stop
OPO5:05 pmPorto
Sep 11
OPO5:55 pmPorto
27h 50m
1 stop
SEA1:45 pmSeattle/Tacoma Intl
$687
Scandinavian Airlines
Sep 5
SEA3:55 pmSeattle/Tacoma Intl
17h 10m
1 stop
OPO5:05 pmPorto
Sep 10
OPO11:50 amPorto
33h 55m
1 stop
SEA1:45 pmSeattle/Tacoma Intl
$738
Scandinavian Airlines
Sep 26
SEA3:55 pmSeattle/Tacoma Intl
17h 10m
1 stop
OPO5:05 pmPorto
Oct 9
OPO5:55 pmPorto
27h 50m
1 stop
SEA1:45 pmSeattle/Tacoma Intl
$757

American Airlines flights from Seattle to Porto

Our best American Airlines deals on Seattle to Porto flight tickets
American Airlines
Oct 11
SEA12:00 pmSeattle/Tacoma Intl
20h 00m
2 stops
OPO4:00 pmPorto
Oct 21
OPO8:20 amPorto
19h 10m
2 stops
SEA7:30 pmSeattle/Tacoma Intl
$798
American Airlines
Oct 5
SEA12:57 pmSeattle/Tacoma Intl
19h 03m
2 stops
OPO4:00 pmPorto
Oct 15
OPO8:20 amPorto
19h 10m
2 stops
SEA7:30 pmSeattle/Tacoma Intl
$799
American Airlines
Nov 1
SEA12:57 pmSeattle/Tacoma Intl
19h 03m
2 stops
OPO4:00 pmPorto
Nov 15
OPO8:20 amPorto
22h 04m
2 stops
SEA10:24 pmSeattle/Tacoma Intl
$819

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 June 4, 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

Cheapest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 9/5

3:55 pm-5:05 pm

1 stop17h 10m

Porto

Fri 9/11

5:55 pm-1:45 pm

1 stop27h 50m

$687

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 9/5

3:55 pm-5:05 pm

1 stop17h 10m

Porto

Thu 9/10

11:50 am-1:45 pm

1 stop33h 55m

$738

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 8/18

3:40 pm-5:50 pm

2 stops18h 10m

Porto

Mon 8/24

6:00 pm-9:40 am

3 stops47h 40m

$740

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 8/18

7:00 pm-8:00 am

3 stops29h 00m

Porto

Mon 8/24

6:00 pm-9:40 am

3 stops47h 40m

$751

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 9/26

3:55 pm-5:05 pm

1 stop17h 10m

Porto

Fri 10/9

5:55 pm-1:45 pm

1 stop27h 50m

$757

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 9/5

8:00 am-12:40 am

3 stops32h 40m

Porto

Sat 9/12

7:10 pm-6:32 pm

3 stops31h 22m

$775

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 10/11

1:30 pm-8:35 pm

1 stop23h 05m

Porto

Wed 10/21

8:20 am-12:14 am

2 stops23h 54m

$795

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 10/11

12:00 pm-4:00 pm

2 stops20h 00m

Porto

Wed 10/21

8:20 am-7:30 pm

2 stops19h 10m

$798
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 10/5

12:57 pm-4:00 pm

2 stops19h 03m

Porto

Thu 10/15

8:20 am-7:30 pm

2 stops19h 10m

$799

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 10/7

1:30 pm-7:05 pm

1 stop21h 35m

Porto

Mon 10/19

8:40 pm-7:30 pm

2 stops30h 50m

$812

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 typical price of a round-trip flight between Seattle and Porto?

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 $498. 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 $680.

How far in advance should I book a flight from Seattle 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 $897 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 $710 on momondo.

Can stopping save me money on Seattle to Porto flights?

You could potentially save up to 28% 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

14h 00m

Direct flights

None
The fastest flight from Seattle to Porto takes 14h 00m
There are no direct flights from Seattle to Porto. There are no popular flight routes from Seattle to Porto.
Search flight deals

Frequently asked questions about flying from Seattle to Porto

  • 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 14h 00m 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
7.8
1,524 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
8,036 reviews
Search Lufthansa flights
DeltaPriceFrom $582Free CancellationRating
7.8
8,392 reviews
Search Delta flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,778 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,127 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $665Free CancellationRating
7.4
4,409 reviews
Search Turkish Airlines flights
Air FrancePriceFrom $905Free CancellationRating
7.4
1,596 reviews
Search Air France 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
Lamego
Chaves
Esposende
Pinhao
Guimarães
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
Curia
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

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