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Cheap flights from Seattle to Porto from $277

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 5/7. 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.
Multiple Airlines Logo
3:40 pm - 11:40 pm
SEA
-
OPO
24h 00m
3 stops
Multiple Airlines Logo
8:50 am - 10:53 pm
OPO
-
SEA
22h 03m
3 stops
$669Multiple Airlines
Mon, Apr 13 - Mon, Apr 20
Multiple Airlines Logo
3:40 pm - 11:40 pm
SEA
-
OPO
24h 00m
3 stops
Multiple Airlines Logo
8:50 am - 10:53 pm
OPO
-
SEA
22h 03m
3 stops
$670Multiple Airlines
Mon, Apr 13 - Mon, Apr 20
Turkish Airlines Logo
7:10 pm - 3:50 pm
SEA
-
OPO
36h 40m
1 stop
Turkish Airlines Logo
10:40 am - 5:15 pm
OPO
-
SEA
38h 35m
1 stop
$671Turkish Airlines
Sun, May 3 - Tue, May 26
Turkish Airlines Logo
7:10 pm - 3:50 pm
SEA
-
OPO
36h 40m
1 stop
Turkish Airlines Logo
4:50 pm - 5:15 pm
OPO
-
SEA
32h 25m
1 stop
$697Turkish Airlines
Sun, May 3 - Tue, May 26
Turkish Airlines Logo
12:35 pm - 3:45 pm
SEA
-
OPO
19h 10m
1 stop
Turkish Airlines Logo
4:50 pm - 5:15 pm
OPO
-
SEA
32h 25m
1 stop
$701Turkish Airlines
Thu, Sep 10 - Tue, Sep 29
Turkish Airlines Logo
7:10 pm - 11:30 pm
SEA
-
OPO
20h 20m
1 stop
Turkish Airlines Logo
6:30 am - 5:15 pm
OPO
-
SEA
18h 45m
1 stop
$710Turkish Airlines
Thu, Apr 16 - Mon, Apr 20
Multiple Airlines Logo
7:00 am - 11:25 am
SEA
-
OPO
20h 25m
2 stops
Multiple Airlines Logo
6:00 am - 8:53 pm
OPO
-
SEA
22h 53m
2 stops
$721Multiple Airlines
Mon, Apr 13 - Tue, Apr 28
SWISS Logo
7:00 am - 11:25 am
SEA
-
OPO
20h 25m
2 stops
SWISS Logo
7:20 pm - 10:42 pm
OPO
-
SEA
35h 22m
2 stops
$723SWISS
Mon, Apr 13 - Mon, Apr 20
Turkish Airlines Logo
7:10 pm - 3:45 pm
SEA
-
OPO
36h 35m
1 stop
Turkish Airlines Logo
6:10 am - 5:15 pm
OPO
-
SEA
19h 05m
1 stop
$724Turkish Airlines
Wed, Apr 8 - Thu, Apr 23
Lufthansa Logo
2:10 pm - 10:50 pm
SEA
-
OPO
24h 40m
1 stop
Lufthansa Logo
6:00 am - 8:53 pm
OPO
-
SEA
22h 53m
2 stops
$726Lufthansa
Mon, Apr 13 - Tue, Apr 28

Turkish Airlines flights from Seattle to Porto

Our best Turkish Airlines deals on Seattle to Porto flight tickets
Turkish Airlines
May 3
SEA7:10 pmSeattle/Tacoma Intl
36h 40m
1 stop
OPO3:50 pmPorto
May 26
OPO10:40 amPorto
38h 35m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$671
Turkish Airlines
May 3
SEA7:10 pmSeattle/Tacoma Intl
36h 40m
1 stop
OPO3:50 pmPorto
May 26
OPO4:50 pmPorto
32h 25m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$697
Turkish Airlines
Mar 22
SEA8:00 pmSeattle/Tacoma Intl
36h 10m
1 stop
OPO3:10 pmPorto
Apr 7
OPO10:40 amPorto
38h 35m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$698

British Airways flights from Seattle to Porto

Our best British Airways deals on Seattle to Porto flight tickets
British Airways
Apr 28
SEA11:16 amSeattle/Tacoma Intl
24h 14m
2 stops
OPO7:30 pmPorto
May 5
OPO12:25 pmPorto
44h 11m
2 stops
SEA12:36 amSeattle/Tacoma Intl
$758
British Airways
Apr 28
SEA1:30 pmSeattle/Tacoma Intl
22h 00m
1 stop
OPO7:30 pmPorto
May 5
OPO12:25 pmPorto
42h 13m
2 stops
SEA10:38 pmSeattle/Tacoma Intl
$759
British Airways
Apr 8
SEA7:00 amSeattle/Tacoma Intl
27h 55m
2 stops
OPO6:55 pmPorto
Apr 22
OPO8:20 amPorto
22h 18m
2 stops
SEA10:38 pmSeattle/Tacoma Intl
$781

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 March 16, 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

Mon 4/13

3:40 pm-11:40 pm

3 stops24h 00m

Porto

Mon 4/20

8:50 am-10:53 pm

3 stops22h 03m

$669

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 4/13

3:40 pm-11:40 pm

3 stops24h 00m

Porto

Mon 4/20

8:50 am-10:53 pm

3 stops22h 03m

$670

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 5/3

7:10 pm-3:50 pm

1 stop36h 40m

Porto

Tue 5/26

10:40 am-5:15 pm

1 stop38h 35m

$671

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 5/3

7:10 pm-3:50 pm

1 stop36h 40m

Porto

Tue 5/26

4:50 pm-5:15 pm

1 stop32h 25m

$697

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 9/10

12:35 pm-3:45 pm

1 stop19h 10m

Porto

Tue 9/29

4:50 pm-5:15 pm

1 stop32h 25m

$701
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 4/16

7:10 pm-11:30 pm

1 stop20h 20m

Porto

Mon 4/20

6:30 am-5:15 pm

1 stop18h 45m

$710

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 4/13

7:00 am-11:25 am

2 stops20h 25m

Porto

Tue 4/28

6:00 am-8:53 pm

2 stops22h 53m

$721

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 4/13

7:00 am-11:25 am

2 stops20h 25m

Porto

Mon 4/20

7:20 pm-10:42 pm

2 stops35h 22m

$723

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 4/8

7:10 pm-3:45 pm

1 stop36h 35m

Porto

Thu 4/23

6:10 am-5:15 pm

1 stop19h 05m

$724

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 4/13

2:10 pm-10:50 pm

1 stop24h 40m

Porto

Tue 4/28

6:00 am-8:53 pm

2 stops22h 53m

$726

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 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 $879 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 $735 on momondo.

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

  • 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
1,472 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
7,857 reviews
Search Lufthansa flights
DeltaPriceFrom $582Free CancellationRating
7.9
8,288 reviews
Search Delta flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,431 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
10,808 reviews
Search Air Canada flights
Air FrancePriceFrom $1,029Free CancellationRating
7.4
1,546 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
Esposende
Lamego
Chaves
Pinhao
Guimarães
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
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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