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Cheap flights from Seattle to Porto from $291

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 5/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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
$737Scandinavian Airlines
Sat, Aug 22 - Thu, Sep 3
Turkish Airlines Logo
7:10 pm - 3:45 pm
SEA
-
OPO
36h 35m
1 stop
Turkish Airlines Logo
10:55 am - 5:05 pm
OPO
-
SEA
38h 10m
1 stop
$738Turkish Airlines
Wed, Oct 21 - Wed, Dec 16
Turkish Airlines Logo
7:10 pm - 9:45 am
SEA
-
OPO
30h 35m
1 stop
Turkish Airlines Logo
10:40 am - 5:15 pm
OPO
-
SEA
38h 35m
1 stop
$762Turkish Airlines
Mon, Sep 21 - Fri, Oct 2
Turkish Airlines Logo
7:10 pm - 3:40 pm
SEA
-
OPO
36h 30m
1 stop
Turkish Airlines Logo
10:45 am - 5:15 pm
OPO
-
SEA
38h 30m
1 stop
$779Turkish Airlines
Tue, May 5 - Wed, May 13
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
$784Scandinavian Airlines
Sat, Aug 22 - Mon, Aug 31
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
$787Scandinavian Airlines
Tue, Aug 25 - Thu, Sep 3
Turkish Airlines Logo
7:10 pm - 11:30 pm
SEA
-
OPO
20h 20m
1 stop
Turkish Airlines Logo
10:45 am - 5:15 pm
OPO
-
SEA
38h 30m
1 stop
$794Turkish Airlines
Tue, Aug 4 - Wed, Sep 9
British Airways Logo
1:30 pm - 8:05 pm
SEA
-
OPO
22h 35m
1 stop
British Airways Logo
8:20 am - 12:14 am
OPO
-
SEA
23h 54m
2 stops
$795British Airways
Mon, Oct 12 - Wed, Oct 21
Turkish Airlines Logo
7:10 pm - 3:40 pm
SEA
-
OPO
36h 30m
1 stop
Turkish Airlines Logo
10:40 am - 5:15 pm
OPO
-
SEA
38h 35m
1 stop
$796Turkish Airlines
Mon, Sep 21 - Fri, Oct 2
Scandinavian Airlines Logo
3:55 pm - 5:05 pm
SEA
-
OPO
17h 10m
1 stop
Scandinavian Airlines Logo
5:55 pm - 10:05 pm
OPO
-
SEA
36h 10m
2 stops
$797Scandinavian Airlines
Sat, Aug 22 - Fri, Sep 4

United Airlines flights from Seattle to Porto

Our best United Airlines deals on Seattle to Porto flight tickets
United Airlines
Aug 4
SEA7:01 amSeattle/Tacoma Intl
15h 54m
2 stops
OPO6:55 amPorto
Sep 9
OPO9:00 amPorto
22h 24m
3 stops
SEA11:24 pmSeattle/Tacoma Intl
$860
United Airlines
Apr 28
SEA8:00 amSeattle/Tacoma Intl
17h 45m
2 stops
OPO9:45 amPorto
May 15
OPO12:35 pmPorto
34h 01m
3 stops
SEA2:36 pmSeattle/Tacoma Intl
$936
United Airlines
May 5
SEA2:10 pmSeattle/Tacoma Intl
17h 35m
1 stop
OPO3:45 pmPorto
May 13
OPO6:00 amPorto
22h 53m
2 stops
SEA8:53 pmSeattle/Tacoma Intl
$939

Delta flights from Seattle to Porto

Our best Delta deals on Seattle to Porto flight tickets
Delta
Oct 3
SEA9:55 pmSeattle/Tacoma Intl
28h 30m
1 stop
OPO10:25 amPorto
Oct 19
OPO11:25 amPorto
32h 27m
1 stop
SEA11:52 amSeattle/Tacoma Intl
$901
Delta
Sep 21
SEA6:45 pmSeattle/Tacoma Intl
19h 15m
1 stop
OPO10:00 pmPorto
Oct 2
OPO5:55 amPorto
21h 05m
2 stops
SEA7:00 pmSeattle/Tacoma Intl
$905

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 April 24, 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 9/3

11:50 am-1:45 pm

1 stop33h 55m

$737

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 10/21

7:10 pm-3:45 pm

1 stop36h 35m

Porto

Wed 12/16

10:55 am-5:05 pm

1 stop38h 10m

$738

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 9/21

7:10 pm-9:45 am

1 stop30h 35m

Porto

Fri 10/2

10:40 am-5:15 pm

1 stop38h 35m

$762

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 5/5

7:10 pm-3:40 pm

1 stop36h 30m

Porto

Wed 5/13

10:45 am-5:15 pm

1 stop38h 30m

$779

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 8/22

3:55 pm-5:05 pm

1 stop17h 10m

Porto

Mon 8/31

11:50 am-1:45 pm

1 stop33h 55m

$784

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 8/25

3:55 pm-11:00 am

1 stop35h 05m

Porto

Thu 9/3

11:50 am-1:45 pm

1 stop33h 55m

$787

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 8/4

7:10 pm-11:30 pm

1 stop20h 20m

Porto

Wed 9/9

10:45 am-5:15 pm

1 stop38h 30m

$794
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 10/12

1:30 pm-8:05 pm

1 stop22h 35m

Porto

Wed 10/21

8:20 am-12:14 am

2 stops23h 54m

$795

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 9/21

7:10 pm-3:40 pm

1 stop36h 30m

Porto

Fri 10/2

10:40 am-5:15 pm

1 stop38h 35m

$796

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 8/22

3:55 pm-5:05 pm

1 stop17h 10m

Porto

Fri 9/4

5:55 pm-10:05 pm

2 stops36h 10m

$797

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 $887 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 $719 on momondo.

Can stopping save me money on Seattle to Porto flights?

You could potentially save up to 43% 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 25m

Direct flights

None
The fastest flight from Seattle to Porto takes 15h 25m
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 25m 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
1,508 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
7,946 reviews
Search Lufthansa flights
DeltaPriceFrom $582Free CancellationRating
7.9
8,452 reviews
Search Delta flights
United AirlinesPriceFrom $651Free CancellationRating
7.4
9,644 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
10,963 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $665Free CancellationRating
7.4
4,328 reviews
Search Turkish Airlines flights
Air FrancePriceFrom $1,029Free CancellationRating
7.4
1,579 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
Esposende
Chaves
Pinhao
Guimarães
Espinho
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

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