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Cheap flights from Seattle to Porto from $255

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 10/18. 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.
Iberia Logo
10:41 am - 4:00 pmSEA  Seattle/Tacoma Intl-OPO Porto
21h 19m2 stops Chicago O'Hare Intl Madrid Barajas
Iberia Logo
8:20 am - 12:41 amOPO  Porto-SEA Seattle/Tacoma Intl
24h 21m2 stops Madrid Barajas Chicago O'Hare Intl
$741Iberia
Wed, Nov 11 - Thu, Nov 26
Multiple Airlines Logo
5:40 pm - 7:45 pmSEA  Seattle/Tacoma Intl-OPO Porto
18h 05m2 stops Frankfurt am Main Milan Malpensa
Multiple Airlines Logo
5:45 pm - 3:40 pmOPO  Porto-SEA Seattle/Tacoma Intl
29h 55m2 stops Milan Malpensa Frankfurt am Main
$742Multiple Airlines
Wed, Oct 7 - Tue, Oct 13
Lufthansa Logo
2:50 pm - 12:50 pmSEA  Seattle/Tacoma Intl-OPO Porto
14h 00m1 stop Munich Franz Josef Strauss
Lufthansa Logo
1:45 pm - 1:00 pmOPO  Porto-SEA Seattle/Tacoma Intl
31h 15m1 stop Munich Franz Josef Strauss
$792Lufthansa
Wed, Nov 11 - Thu, Nov 26
Delta Logo
4:05 pm - 10:00 pmSEA  Seattle/Tacoma Intl-OPO Porto
21h 55m1 stop Paris Charles de Gaulle
Delta Logo
5:00 am - 11:47 amOPO  Porto-SEA Seattle/Tacoma Intl
14h 47m1 stop Amsterdam Schiphol
$802Delta
Tue, Nov 3 - Tue, Nov 10
Delta Logo
3:25 pm - 10:00 pmSEA  Seattle/Tacoma Intl-OPO Porto
22h 35m1 stop Paris Charles de Gaulle
Delta Logo
11:15 am - 11:47 amOPO  Porto-SEA Seattle/Tacoma Intl
32h 32m1 stop Amsterdam Schiphol
$802Delta
Wed, Nov 4 - Tue, Nov 10
United Airlines Logo
8:30 am - 9:30 amSEA  Seattle/Tacoma Intl-OPO Porto
17h 00m2 stops Denver Intl Newark
United Airlines Logo
6:00 am - 5:54 pmOPO  Porto-SEA Seattle/Tacoma Intl
19h 54m2 stops Frankfurt am Main Denver Intl
$811United Airlines
Tue, Nov 10 - Wed, Nov 25
United Airlines Logo
6:45 am - 9:30 amSEA  Seattle/Tacoma Intl-OPO Porto
18h 45m1 stop Newark
United Airlines Logo
6:00 am - 11:18 pmOPO  Porto-SEA Seattle/Tacoma Intl
25h 18m3 stops Frankfurt am Main Denver Intl San Francisco
$811United Airlines
Mon, Nov 9 - Fri, Nov 20
Air Canada Logo
7:45 am - 12:50 pmSEA  Seattle/Tacoma Intl-OPO Porto
21h 05m2 stops Toronto Pearson Intl Munich Franz Josef Strauss
Air Canada Logo
6:00 am - 6:22 pmOPO  Porto-SEA Seattle/Tacoma Intl
20h 22m2 stops Frankfurt am Main Vancouver Intl
$812Air Canada
Mon, Nov 9 - Tue, Nov 24
Air Canada Logo
7:45 am - 12:50 pmSEA  Seattle/Tacoma Intl-OPO Porto
21h 05m2 stops Toronto Pearson Intl Munich Franz Josef Strauss
Air Canada Logo
6:00 am - 9:57 pmOPO  Porto-SEA Seattle/Tacoma Intl
23h 57m2 stops Frankfurt am Main Vancouver Intl
$812Air Canada
Sun, Nov 8 - Thu, Nov 26
Lufthansa Logo
6:50 pm - 11:25 pmSEA  Seattle/Tacoma Intl-OPO Porto
20h 35m1 stop Munich Franz Josef Strauss
Lufthansa Logo
6:15 am - 2:00 pmOPO  Porto-SEA Seattle/Tacoma Intl
14h 45m1 stop Munich Franz Josef Strauss
$822Lufthansa
Wed, Oct 14 - Fri, Oct 30

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Delta flights from Seattle to Porto

Our best Delta deals on Seattle to Porto flight tickets
Delta
Nov 8
SEA3:25 pmSeattle/Tacoma Intl
22h 35m
1 stop
OPO10:00 pmPorto
Nov 26
OPO11:15 amPorto
32h 32m
1 stop
SEA11:47 amSeattle/Tacoma Intl
$802
Delta
Nov 7
SEA11:50 pmSeattle/Tacoma Intl
25h 15m
2 stops
OPO9:05 amPorto
Nov 24
OPO11:15 amPorto
32h 32m
1 stop
SEA11:47 amSeattle/Tacoma Intl
$807
Delta
Oct 31
SEA11:10 pmSeattle/Tacoma Intl
26h 55m
2 stops
OPO9:05 amPorto
Nov 9
OPO11:15 amPorto
32h 32m
1 stop
SEA11:47 amSeattle/Tacoma Intl
$813

United Airlines flights from Seattle to Porto

Our best United Airlines deals on Seattle to Porto flight tickets
United Airlines
Nov 10
SEA8:30 amSeattle/Tacoma Intl
17h 00m
2 stops
OPO9:30 amPorto
Nov 26
OPO12:35 pmPorto
29h 05m
2 stops
SEA9:40 amSeattle/Tacoma Intl
$811
United Airlines
Oct 12
SEA11:13 pmSeattle/Tacoma Intl
23h 47m
2 stops
OPO7:00 amPorto
Oct 29
OPO6:00 amPorto
20h 03m
2 stops
SEA7:03 pmSeattle/Tacoma Intl
$833
United Airlines
Nov 6
SEA10:56 pmSeattle/Tacoma Intl
50h 34m
2 stops
OPO9:30 amPorto
Nov 25
OPO12:35 pmPorto
17h 04m
1 stop
SEA9:39 pmSeattle/Tacoma Intl
$837

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 August 15, 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 Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 11/11

10:41 am-4:00 pm

2 stops21h 19m

Porto

Thu 11/26

8:20 am-12:41 am

2 stops24h 21m

$741

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 10/7

5:40 pm-7:45 pm

2 stops18h 05m

Porto

Tue 10/13

5:45 pm-3:40 pm

2 stops29h 55m

$742

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 11/11

2:50 pm-12:50 pm

1 stop14h 00m

Porto

Thu 11/26

1:45 pm-1:00 pm

1 stop31h 15m

$792

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 11/3

4:05 pm-10:00 pm

1 stop21h 55m

Porto

Tue 11/10

5:00 am-11:47 am

1 stop14h 47m

$802

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 11/4

3:25 pm-10:00 pm

1 stop22h 35m

Porto

Tue 11/10

11:15 am-11:47 am

1 stop32h 32m

$802

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 11/10

8:30 am-9:30 am

2 stops17h 00m

Porto

Wed 11/25

6:00 am-5:54 pm

2 stops19h 54m

$811

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 11/9

6:45 am-9:30 am

1 stop18h 45m

Porto

Fri 11/20

6:00 am-11:18 pm

3 stops25h 18m

$811

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 11/9

7:45 am-12:50 pm

2 stops21h 05m

Porto

Tue 11/24

6:00 am-6:22 pm

2 stops20h 22m

$812

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 11/8

7:45 am-12:50 pm

2 stops21h 05m

Porto

Thu 11/26

6:00 am-9:57 pm

2 stops23h 57m

$812
Quickest round-trip

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 10/14

6:50 pm-11:25 pm

1 stop20h 35m

Porto

Fri 10/30

6:15 am-2:00 pm

1 stop14h 45m

$822

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?

Prices are currently low for flights on this route.

Typical prices usually range from $923 to $1,269.
The lowest price recently found on this route was $741.

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 $904 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 23% 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

13h 20m

Direct flights

None
The fastest flight from Seattle to Porto takes 13h 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 13h 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
1,559 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
8,194 reviews
Search Lufthansa flights
DeltaPriceFrom $588Free CancellationRating
7.8
8,509 reviews
Search Delta flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
10,112 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,478 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $692Free CancellationRating
7.4
4,474 reviews
Search Turkish Airlines flights
Air FrancePriceFrom $905Free CancellationRating
7.5
1,644 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
Pinhao
Esposende
Chaves
Arcos de Valdevez
Viseu
Guimarães
Espinho
Lamego
Ponte de Lima
Mesao Frio
Penafiel
Caminha
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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