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Cheap flights from Seattle to Porto from $285

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 11/14. 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.
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, Aug 22 - Thu, Sep 10
Iberia Logo
6:50 pm - 8:00 pm
SEA
-
OPO
17h 10m
2 stops
Iberia Logo
9:55 pm - 4:55 pm
OPO
-
SEA
27h 00m
2 stops
$774Iberia
Mon, Nov 9 - Mon, Nov 23
Iberia Logo
7:40 am - 4:00 pm
SEA
-
OPO
24h 20m
2 stops
Iberia Logo
8:40 pm - 11:08 am
OPO
-
SEA
21h 28m
2 stops
$781Iberia
Mon, Oct 19 - Wed, Oct 28
Multiple Airlines Logo
5:24 am - 8:00 pm
SEA
-
OPO
30h 36m
2 stops
Multiple Airlines Logo
8:40 pm - 11:05 pm
OPO
-
SEA
34h 25m
2 stops
$782Multiple Airlines
Mon, Nov 9 - Mon, Nov 23
Scandinavian Airlines Logo
7:20 am - 4:45 pm
SEA
-
OPO
25h 25m
2 stops
Scandinavian Airlines Logo
11:55 am - 10:11 pm
OPO
-
SEA
42h 16m
2 stops
$783Scandinavian Airlines
Sat, Nov 7 - Wed, Nov 25
Scandinavian Airlines Logo
3:55 pm - 11:00 am
SEA
-
OPO
35h 05m
1 stop
Scandinavian Airlines Logo
11:50 am - 1:45 pm
OPO
-
SEA
33h 55m
1 stop
$788Scandinavian Airlines
Tue, Aug 25 - Thu, Sep 10
Multiple Airlines Logo
3:40 pm - 8:00 am
SEA
-
OPO
32h 20m
3 stops
Multiple Airlines Logo
6:00 pm - 9:40 am
OPO
-
SEA
47h 40m
3 stops
$789Multiple Airlines
Tue, Aug 18 - Mon, Aug 31
Multiple Airlines Logo
8:20 pm - 7:30 pm
SEA
-
OPO
15h 10m
1 stop
Multiple Airlines Logo
8:20 am - 12:14 am
OPO
-
SEA
22h 54m
2 stops
$794Multiple Airlines
Tue, Oct 6 - Thu, Oct 29
Multiple Airlines Logo
12:57 pm - 4:00 pm
SEA
-
OPO
19h 03m
2 stops
Multiple Airlines Logo
8:20 am - 7:30 pm
OPO
-
SEA
19h 10m
2 stops
$798Multiple 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

Air Canada flights from Seattle to Porto

Our best Air Canada deals on Seattle to Porto flight tickets
Air Canada
Nov 9
SEA7:45 amSeattle/Tacoma Intl
21h 05m
2 stops
OPO12:50 pmPorto
Nov 24
OPO6:00 amPorto
20h 22m
2 stops
SEA6:22 pmSeattle/Tacoma Intl
$813
Air Canada
Nov 8
SEA7:45 amSeattle/Tacoma Intl
43h 30m
2 stops
OPO11:15 amPorto
Nov 25
OPO6:00 amPorto
35h 17m
2 stops
SEA9:17 amSeattle/Tacoma Intl
$815
Air Canada
Nov 7
SEA3:15 pmSeattle/Tacoma Intl
40h 05m
2 stops
OPO3:20 pmPorto
Nov 26
OPO6:00 amPorto
23h 57m
2 stops
SEA9:57 pmSeattle/Tacoma Intl
$817

Turkish Airlines flights from Seattle to Porto

Our best Turkish Airlines deals on Seattle to Porto flight tickets
Turkish Airlines
Jun 2
SEA7:10 pmSeattle/Tacoma Intl
30h 50m
1 stop
OPO10:00 amPorto
Jun 24
OPO10:45 amPorto
38h 35m
1 stop
SEA5:20 pmSeattle/Tacoma Intl
$5,635
Turkish Airlines
Jun 4
SEA7:10 pmSeattle/Tacoma Intl
20h 20m
1 stop
OPO11:30 pmPorto
Jun 22
OPO10:40 amPorto
38h 40m
1 stop
SEA5:20 pmSeattle/Tacoma Intl
$5,685
Turkish Airlines
Jun 4
SEA7:10 pmSeattle/Tacoma Intl
20h 20m
1 stop
OPO11:30 pmPorto
Jun 19
OPO10:40 amPorto
32h 00m
1 stop
SEA10:40 amSeattle/Tacoma Intl
$5,735

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 May 30, 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 8/22

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

Mon 11/9

6:50 pm-8:00 pm

2 stops17h 10m

Porto

Mon 11/23

9:55 pm-4:55 pm

2 stops27h 00m

$774

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 10/19

7:40 am-4:00 pm

2 stops24h 20m

Porto

Wed 10/28

8:40 pm-11:08 am

2 stops21h 28m

$781

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/9

5:24 am-8:00 pm

2 stops30h 36m

Porto

Mon 11/23

8:40 pm-11:05 pm

2 stops34h 25m

$782

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 11/7

7:20 am-4:45 pm

2 stops25h 25m

Porto

Wed 11/25

11:55 am-10:11 pm

2 stops42h 16m

$783

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 8/25

3:55 pm-11:00 am

1 stop35h 05m

Porto

Thu 9/10

11:50 am-1:45 pm

1 stop33h 55m

$788

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 8/18

3:40 pm-8:00 am

3 stops32h 20m

Porto

Mon 8/31

6:00 pm-9:40 am

3 stops47h 40m

$789
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 10/6

8:20 pm-7:30 pm

1 stop15h 10m

Porto

Thu 10/29

8:20 am-12:14 am

2 stops22h 54m

$794

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 10/11

12:57 pm-4:00 pm

2 stops19h 03m

Porto

Wed 10/21

8:20 am-7:30 pm

2 stops19h 10m

$798

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

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 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

15h 10m

Direct flights

None
The fastest flight from Seattle to Porto takes 15h 10m
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 15h 10m 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
8,031 reviews
Search Lufthansa flights
DeltaPriceFrom $582Free CancellationRating
7.9
8,412 reviews
Search Delta flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,768 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,107 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $665Free CancellationRating
7.4
4,405 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
Aveiro
Braga
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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