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Cheap flights from Seattle to Porto from $246

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 9/7. 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

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
6:50 pm - 8:00 pm
SEA
-
OPO
17h 10m
2 stops
Iberia Logo
4:40 pm - 11:12 am
OPO
-
SEA
26h 32m
2 stops
$739Iberia
Mon, Nov 2 - Wed, Nov 11
Iberia Logo
6:50 pm - 8:00 pm
SEA
-
OPO
17h 10m
2 stops
Iberia Logo
4:40 pm - 11:12 am
OPO
-
SEA
26h 32m
2 stops
$744Iberia
Mon, Nov 2 - Wed, Nov 11
Delta Logo
3:25 pm - 10:00 pm
SEA
-
OPO
22h 35m
1 stop
Delta Logo
5:00 am - 11:47 am
OPO
-
SEA
14h 47m
1 stop
$806Delta
Mon, Nov 2 - Wed, Nov 11
KLM Logo
7:15 am - 9:05 am
SEA
-
OPO
17h 50m
1 stop
KLM Logo
5:00 am - 11:47 am
OPO
-
SEA
14h 47m
1 stop
$807KLM
Wed, Nov 4 - Thu, Nov 12
Delta Logo
7:15 am - 10:35 am
SEA
-
OPO
19h 20m
2 stops
Delta Logo
5:00 am - 11:47 am
OPO
-
SEA
14h 47m
1 stop
$811Delta
Wed, Nov 4 - Thu, Nov 12
KLM Logo
2:35 pm - 3:25 pm
SEA
-
OPO
16h 50m
1 stop
KLM Logo
5:00 am - 11:47 am
OPO
-
SEA
14h 47m
1 stop
$811KLM
Mon, Nov 2 - Wed, Nov 11
United Airlines Logo
6:45 am - 9:30 am
SEA
-
OPO
18h 45m
1 stop
United Airlines Logo
6:00 am - 9:39 pm
OPO
-
SEA
23h 39m
2 stops
$815United Airlines
Mon, Nov 2 - Wed, Nov 11
United Airlines Logo
6:45 am - 9:30 am
SEA
-
OPO
18h 45m
1 stop
United Airlines Logo
6:00 am - 11:15 pm
OPO
-
SEA
25h 15m
2 stops
$816United Airlines
Mon, Nov 2 - Wed, Nov 11
Lufthansa Logo
1:50 pm - 10:25 pm
SEA
-
OPO
24h 35m
1 stop
Lufthansa Logo
6:00 am - 7:03 pm
OPO
-
SEA
21h 03m
2 stops
$823Lufthansa
Mon, Nov 2 - Wed, Nov 11
Lufthansa Logo
1:50 pm - 10:25 pm
SEA
-
OPO
24h 35m
1 stop
Lufthansa Logo
1:45 pm - 1:00 pm
OPO
-
SEA
31h 15m
1 stop
$823Lufthansa
Mon, Dec 28 - Tue, Jan 5

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Lufthansa flights from Seattle to Porto

Our best Lufthansa deals on Seattle to Porto flight tickets
Lufthansa
Nov 2
SEA2:00 pmSeattle/Tacoma Intl
17h 20m
1 stop
OPO3:20 pmPorto
Nov 11
OPO6:00 amPorto
21h 03m
2 stops
SEA7:03 pmSeattle/Tacoma Intl
$823
Lufthansa
Oct 5
SEA2:10 pmSeattle/Tacoma Intl
17h 30m
1 stop
OPO3:40 pmPorto
Oct 16
OPO6:20 amPorto
18h 39m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$826
Lufthansa
Oct 11
SEA7:20 pmSeattle/Tacoma Intl
27h 40m
2 stops
OPO7:00 amPorto
Oct 21
OPO6:20 amPorto
18h 39m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$829

Delta flights from Seattle to Porto

Our best Delta deals on Seattle to Porto flight tickets
Delta
Nov 2
SEA3:25 pmSeattle/Tacoma Intl
22h 35m
1 stop
OPO10:00 pmPorto
Nov 11
OPO5:00 amPorto
14h 47m
1 stop
SEA11:47 amSeattle/Tacoma Intl
$806
Delta
Oct 7
SEA6:40 pmSeattle/Tacoma Intl
19h 20m
1 stop
OPO10:00 pmPorto
Oct 15
OPO5:00 amPorto
19h 35m
1 stop
SEA4:35 pmSeattle/Tacoma Intl
$835
Delta
Oct 7
SEA6:40 pmSeattle/Tacoma Intl
19h 20m
1 stop
OPO10:00 pmPorto
Oct 15
OPO5:00 amPorto
19h 35m
1 stop
SEA4:35 pmSeattle/Tacoma Intl
$840

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 30, 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 11/2

6:50 pm-8:00 pm

2 stops17h 10m

Porto

Wed 11/11

4:40 pm-11:12 am

2 stops26h 32m

$739

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/2

6:50 pm-8:00 pm

2 stops17h 10m

Porto

Wed 11/11

4:40 pm-11:12 am

2 stops26h 32m

$744

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/2

3:25 pm-10:00 pm

1 stop22h 35m

Porto

Wed 11/11

5:00 am-11:47 am

1 stop14h 47m

$806

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 11/4

7:15 am-9:05 am

1 stop17h 50m

Porto

Thu 11/12

5:00 am-11:47 am

1 stop14h 47m

$807

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 11/4

7:15 am-10:35 am

2 stops19h 20m

Porto

Thu 11/12

5:00 am-11:47 am

1 stop14h 47m

$811
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/2

2:35 pm-3:25 pm

1 stop16h 50m

Porto

Wed 11/11

5:00 am-11:47 am

1 stop14h 47m

$811

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/2

6:45 am-9:30 am

1 stop18h 45m

Porto

Wed 11/11

6:00 am-9:39 pm

2 stops23h 39m

$815

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/2

6:45 am-9:30 am

1 stop18h 45m

Porto

Wed 11/11

6:00 am-11:15 pm

2 stops25h 15m

$816

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/2

1:50 pm-10:25 pm

1 stop24h 35m

Porto

Wed 11/11

6:00 am-7:03 pm

2 stops21h 03m

$823

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 12/28

1:50 pm-10:25 pm

1 stop24h 35m

Porto

Tue 1/5

1:45 pm-1:00 pm

1 stop31h 15m

$823

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 $982 to $1,329.
The lowest price recently found on this route was $739.

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 33% 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
1,551 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
8,167 reviews
Search Lufthansa flights
DeltaPriceFrom $588Free CancellationRating
7.8
8,491 reviews
Search Delta flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
10,053 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,413 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $692Free CancellationRating
7.4
4,456 reviews
Search Turkish Airlines flights
Air FrancePriceFrom $905Free CancellationRating
7.5
1,630 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
Lamego
Chaves
Arcos de Valdevez
Guimarães
Viseu
Espinho
Ponte de Lima
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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