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Cheap flights from Seattle to Porto from $231

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 10/12. 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

Discover deals from 900+ travel sites with momondo.

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 - 9:20 pm
SEA
-
OPO
21h 40m
2 stops
Multiple Airlines Logo
9:15 pm - 8:40 pm
OPO
-
SEA
31h 25m
3 stops
$606Multiple Airlines
Sun, Sep 27 - Mon, Oct 12
Multiple Airlines Logo
3:40 pm - 12:40 am
SEA
-
OPO
25h 00m
3 stops
Multiple Airlines Logo
10:30 pm - 8:40 pm
OPO
-
SEA
30h 10m
3 stops
$648Multiple Airlines
Sun, Sep 27 - Mon, Oct 12
Multiple Airlines Logo
3:40 pm - 9:55 pm
SEA
-
OPO
22h 15m
2 stops
Multiple Airlines Logo
10:30 pm - 8:40 pm
OPO
-
SEA
30h 10m
3 stops
$687Multiple Airlines
Sun, Sep 20 - Mon, Sep 28
Multiple Airlines Logo
3:40 pm - 10:00 am
SEA
-
OPO
34h 20m
3 stops
Multiple Airlines Logo
10:30 pm - 8:40 pm
OPO
-
SEA
30h 10m
3 stops
$704Multiple Airlines
Sun, Sep 20 - Mon, Sep 28
Multiple Airlines Logo
3:40 pm - 10:55 pm
SEA
-
OPO
23h 15m
2 stops
Multiple Airlines Logo
7:15 am - 9:04 pm
OPO
-
SEA
21h 49m
3 stops
$741Multiple Airlines
Wed, Sep 16 - Thu, Sep 24
Multiple Airlines Logo
7:00 pm - 10:55 pm
SEA
-
OPO
19h 55m
2 stops
Multiple Airlines Logo
6:55 am - 8:40 pm
OPO
-
SEA
21h 45m
2 stops
$747Multiple Airlines
Tue, Sep 22 - Sat, Oct 10
Multiple Airlines Logo
3:40 pm - 10:55 pm
SEA
-
OPO
23h 15m
2 stops
Multiple Airlines Logo
7:00 am - 9:04 pm
OPO
-
SEA
22h 04m
3 stops
$758Multiple Airlines
Wed, Sep 16 - Thu, Sep 24
Iberia Logo
6:12 am - 11:45 am
SEA
-
OPO
21h 33m
2 stops
Iberia Logo
8:40 pm - 9:45 am
OPO
-
SEA
21h 05m
2 stops
$763Iberia
Sun, Nov 1 - Wed, Nov 18
Multiple Airlines Logo
6:05 pm - 8:00 am
SEA
-
OPO
29h 55m
3 stops
Multiple Airlines Logo
8:15 pm - 4:00 pm
OPO
-
SEA
27h 45m
2 stops
$769Multiple Airlines
Tue, Oct 6 - Wed, Oct 14
Multiple Airlines Logo
1:30 pm - 7:05 pm
SEA
-
OPO
21h 35m
1 stop
Multiple Airlines Logo
12:25 pm - 12:10 am
OPO
-
SEA
19h 45m
2 stops
$776Multiple Airlines
Wed, Oct 14 - Wed, Oct 21

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Iberia flights from Seattle to Porto

Our best Iberia deals on Seattle to Porto flight tickets
Iberia
Nov 1
SEA6:12 amSeattle/Tacoma Intl
21h 33m
2 stops
OPO11:45 amPorto
Nov 18
OPO8:40 pmPorto
21h 05m
2 stops
SEA9:45 amSeattle/Tacoma Intl
$763
Iberia
Jul 15
SEA6:00 amSeattle/Tacoma Intl
21h 45m
2 stops
OPO11:45 amPorto
Jul 28
OPO12:25 pmPorto
31h 10m
2 stops
SEA11:35 amSeattle/Tacoma Intl
$1,311
Iberia
Jul 15
SEA6:00 amSeattle/Tacoma Intl
21h 45m
2 stops
OPO11:45 amPorto
Jul 28
OPO4:50 pmPorto
26h 45m
2 stops
SEA11:35 amSeattle/Tacoma Intl
$1,320

British Airways flights from Seattle to Porto

Our best British Airways deals on Seattle to Porto flight tickets
British Airways
Oct 6
SEA1:30 pmSeattle/Tacoma Intl
22h 00m
1 stop
OPO7:30 pmPorto
Oct 14
OPO8:20 amPorto
23h 50m
2 stops
SEA12:10 amSeattle/Tacoma Intl
$793
British Airways
Dec 29
SEA6:50 pmSeattle/Tacoma Intl
14h 55m
1 stop
OPO5:45 pmPorto
Feb 1
OPO5:30 pmPorto
26h 00m
1 stop
SEA11:30 amSeattle/Tacoma Intl
$799

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 July 8, 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

Sun 9/27

3:40 pm-9:20 pm

2 stops21h 40m

Porto

Mon 10/12

9:15 pm-8:40 pm

3 stops31h 25m

$606

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 9/27

3:40 pm-12:40 am

3 stops25h 00m

Porto

Mon 10/12

10:30 pm-8:40 pm

3 stops30h 10m

$648

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 9/20

3:40 pm-9:55 pm

2 stops22h 15m

Porto

Mon 9/28

10:30 pm-8:40 pm

3 stops30h 10m

$687

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 9/20

3:40 pm-10:00 am

3 stops34h 20m

Porto

Mon 9/28

10:30 pm-8:40 pm

3 stops30h 10m

$704

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 9/16

3:40 pm-10:55 pm

2 stops23h 15m

Porto

Thu 9/24

7:15 am-9:04 pm

3 stops21h 49m

$741

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 9/22

7:00 pm-10:55 pm

2 stops19h 55m

Porto

Sat 10/10

6:55 am-8:40 pm

2 stops21h 45m

$747

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 9/16

3:40 pm-10:55 pm

2 stops23h 15m

Porto

Thu 9/24

7:00 am-9:04 pm

3 stops22h 04m

$758

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 11/1

6:12 am-11:45 am

2 stops21h 33m

Porto

Wed 11/18

8:40 pm-9:45 am

2 stops21h 05m

$763

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 10/6

6:05 pm-8:00 am

3 stops29h 55m

Porto

Wed 10/14

8:15 pm-4:00 pm

2 stops27h 45m

$769
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 10/14

1:30 pm-7:05 pm

1 stop21h 35m

Porto

Wed 10/21

12:25 pm-12:10 am

2 stops19h 45m

$776

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 $912 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 52% 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

17h 20m

Direct flights

None
The fastest flight from Seattle to Porto takes 17h 20m
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 17h 20m 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
1,534 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
8,123 reviews
Search Lufthansa flights
DeltaPriceFrom $588Free CancellationRating
7.8
8,452 reviews
Search Delta flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,955 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,321 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $685Free CancellationRating
7.4
4,441 reviews
Search Turkish Airlines flights
Air FrancePriceFrom $905Free CancellationRating
7.5
1,625 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
Esposende
Lamego
Chaves
Pinhao
Arcos de Valdevez
Guimarães
Espinho
Ponte de Lima
Viseu
Curia
Mesao Frio
Penafiel
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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