Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Seattle to Porto from $321

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 8/16. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Seattle to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
10:35 am - 4:40 pm
SEA
-
OPO
22h 05m
2 stops
British Airways Logo
8:40 pm - 9:18 pm
OPO
-
SEA
32h 38m
2 stops
$777British Airways
Sun, Nov 1 - Wed, Nov 11
Turkish Airlines Logo
7:10 pm - 3:45 pm
SEA
-
OPO
36h 35m
1 stop
Turkish Airlines Logo
10:40 am - 5:15 pm
OPO
-
SEA
38h 35m
1 stop
$791Turkish Airlines
Wed, Sep 16 - Tue, Sep 22
Iberia Logo
2:06 pm - 4:00 pm
SEA
-
OPO
17h 54m
2 stops
Iberia Logo
12:25 pm - 12:36 am
OPO
-
SEA
20h 11m
2 stops
$799Iberia
Wed, Aug 12 - Thu, Aug 27
Multiple Airlines Logo
5:40 am - 6:30 pm
SEA
-
OPO
28h 50m
2 stops
Multiple Airlines Logo
4:05 pm - 12:10 pm
OPO
-
SEA
28h 05m
1 stop
$802Multiple Airlines
Wed, Oct 21 - Wed, Dec 16
British Airways Logo
10:35 am - 4:40 pm
SEA
-
OPO
22h 05m
2 stops
British Airways Logo
6:35 pm - 11:30 am
OPO
-
SEA
24h 55m
1 stop
$807British Airways
Sun, Nov 1 - Wed, Nov 11
Multiple Airlines Logo
11:34 am - 4:00 pm
SEA
-
OPO
20h 26m
2 stops
Multiple Airlines Logo
8:40 pm - 9:11 pm
OPO
-
SEA
32h 31m
2 stops
$812Multiple Airlines
Wed, Oct 21 - Wed, Dec 16
Multiple Airlines Logo
5:45 am - 7:00 am
SEA
-
OPO
17h 15m
2 stops
Multiple Airlines Logo
6:20 am - 4:59 pm
OPO
-
SEA
18h 39m
1 stop
$821Multiple Airlines
Wed, Aug 12 - Thu, Aug 27
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
$830Turkish Airlines
Thu, Sep 10 - Mon, Sep 28
Iberia Logo
2:12 pm - 4:00 pm
SEA
-
OPO
17h 48m
2 stops
Iberia Logo
8:40 pm - 11:08 am
OPO
-
SEA
21h 28m
2 stops
$832Iberia
Thu, Oct 15 - Wed, Oct 28
Air Canada Logo
7:20 pm - 7:00 am
SEA
-
OPO
51h 40m
2 stops
Air Canada Logo
12:15 pm - 10:07 am
OPO
-
SEA
29h 52m
2 stops
$847Air Canada
Sat, Aug 8 - Tue, Aug 25

Air Canada flights from Seattle to Porto

Our best Air Canada deals on Seattle to Porto flight tickets
Air Canada
Aug 8
SEA7:20 pmSeattle/Tacoma Intl
51h 40m
2 stops
OPO7:00 amPorto
Aug 25
OPO12:15 pmPorto
29h 52m
2 stops
SEA10:07 amSeattle/Tacoma Intl
$847
Air Canada
Jul 4
SEA7:20 pmSeattle/Tacoma Intl
27h 30m
2 stops
OPO6:50 amPorto
Jul 16
OPO3:00 amPorto
26h 07m
2 stops
SEA9:07 pmSeattle/Tacoma Intl
$911
Air Canada
Jul 15
SEA5:45 amSeattle/Tacoma Intl
17h 15m
2 stops
OPO7:00 amPorto
Jul 28
OPO12:15 pmPorto
34h 07m
2 stops
SEA2:22 pmSeattle/Tacoma Intl
$912

Iberia flights from Seattle to Porto

Our best Iberia deals on Seattle to Porto flight tickets
Iberia
Aug 12
SEA2:06 pmSeattle/Tacoma Intl
17h 54m
2 stops
OPO4:00 pmPorto
Aug 27
OPO12:25 pmPorto
20h 11m
2 stops
SEA12:36 amSeattle/Tacoma Intl
$799
Iberia
Oct 15
SEA2:12 pmSeattle/Tacoma Intl
17h 48m
2 stops
OPO4:00 pmPorto
Oct 28
OPO8:40 pmPorto
21h 28m
2 stops
SEA11:08 amSeattle/Tacoma Intl
$832

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 9, 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 11/1

10:35 am-4:40 pm

2 stops22h 05m

Porto

Wed 11/11

8:40 pm-9:18 pm

2 stops32h 38m

$777

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 9/16

7:10 pm-3:45 pm

1 stop36h 35m

Porto

Tue 9/22

10:40 am-5:15 pm

1 stop38h 35m

$791

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 8/12

2:06 pm-4:00 pm

2 stops17h 54m

Porto

Thu 8/27

12:25 pm-12:36 am

2 stops20h 11m

$799

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 10/21

5:40 am-6:30 pm

2 stops28h 50m

Porto

Wed 12/16

4:05 pm-12:10 pm

1 stop28h 05m

$802

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 11/1

10:35 am-4:40 pm

2 stops22h 05m

Porto

Wed 11/11

6:35 pm-11:30 am

1 stop24h 55m

$807

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 10/21

11:34 am-4:00 pm

2 stops20h 26m

Porto

Wed 12/16

8:40 pm-9:11 pm

2 stops32h 31m

$812
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 8/12

5:45 am-7:00 am

2 stops17h 15m

Porto

Thu 8/27

6:20 am-4:59 pm

1 stop18h 39m

$821

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 9/10

7:10 pm-9:45 am

1 stop30h 35m

Porto

Mon 9/28

10:40 am-5:15 pm

1 stop38h 35m

$830

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 10/15

2:12 pm-4:00 pm

2 stops17h 48m

Porto

Wed 10/28

8:40 pm-11:08 am

2 stops21h 28m

$832

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 8/8

7:20 pm-7:00 am

2 stops51h 40m

Porto

Tue 8/25

12:15 pm-10:07 am

2 stops29h 52m

$847

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $885 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 57% 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 15m

Direct flights

None
The fastest flight from Seattle to Porto takes 17h 15m
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 15m 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
1,513 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
7,985 reviews
Search Lufthansa flights
DeltaPriceFrom $582Free CancellationRating
7.9
8,455 reviews
Search Delta flights
United AirlinesPriceFrom $651Free CancellationRating
7.4
9,694 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,012 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $665Free CancellationRating
7.4
4,357 reviews
Search Turkish Airlines flights
Air FrancePriceFrom $1,029Free CancellationRating
7.4
1,585 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
Espinho
Guimarães
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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 6/8
Mon 6/15
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Portugal