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Cheap flights from Seattle to Porto from $328

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 8/20. 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

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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.
Scandinavian Airlines Logo
7:20 am - 11:05 am
SEA
-
OPO
19h 45m
2 stops
Scandinavian Airlines Logo
5:50 pm - 12:18 am
OPO
-
SEA
38h 28m
2 stops
$749Scandinavian Airlines
mar, nov 3 - gio, nov 19
Multiple Airlines Logo
3:40 pm - 7:35 am
SEA
-
OPO
31h 55m
3 stops
Multiple Airlines Logo
7:10 am - 8:40 pm
OPO
-
SEA
21h 30m
2 stops
$757Multiple Airlines
mar, set 8 - mar, set 22
British Airways Logo
6:50 pm - 5:50 pm
SEA
-
OPO
15h 00m
1 stop
British Airways Logo
8:40 pm - 10:15 pm
OPO
-
SEA
33h 35m
2 stops
$771British Airways
mer, nov 4 - mer, nov 18
Iberia Logo
6:50 pm - 8:00 pm
SEA
-
OPO
17h 10m
2 stops
Iberia Logo
9:55 pm - 4:55 pm
OPO
-
SEA
27h 00m
2 stops
$773Iberia
lun, nov 2 - lun, nov 16
British Airways Logo
2:46 pm - 5:50 pm
SEA
-
OPO
19h 04m
2 stops
British Airways Logo
8:40 pm - 10:15 pm
OPO
-
SEA
33h 35m
2 stops
$776British Airways
mer, nov 4 - mer, nov 18
Multiple Airlines Logo
5:24 am - 8:00 pm
SEA
-
OPO
30h 36m
2 stops
Multiple Airlines Logo
8:40 pm - 10:15 pm
OPO
-
SEA
33h 35m
2 stops
$782Multiple Airlines
lun, nov 9 - lun, nov 23
Scandinavian Airlines Logo
7:20 am - 11:05 am
SEA
-
OPO
19h 45m
2 stops
Scandinavian Airlines Logo
5:35 pm - 10:12 pm
OPO
-
SEA
36h 37m
2 stops
$783Scandinavian Airlines
dom, nov 1 - dom, nov 15
British Airways Logo
6:50 pm - 5:50 pm
SEA
-
OPO
15h 00m
1 stop
British Airways Logo
6:35 pm - 11:30 am
OPO
-
SEA
24h 55m
1 stop
$787British Airways
mer, nov 4 - mer, nov 18
Multiple Airlines Logo
10:17 am - 8:00 pm
SEA
-
OPO
26h 43m
2 stops
Multiple Airlines Logo
8:40 pm - 11:05 pm
OPO
-
SEA
34h 25m
2 stops
$788Multiple Airlines
lun, ott 26 - gio, nov 5
Scandinavian Airlines Logo
3:55 pm - 10:00 pm
SEA
-
OPO
22h 05m
2 stops
Scandinavian Airlines Logo
11:50 am - 1:45 pm
OPO
-
SEA
33h 55m
1 stop
$793Scandinavian Airlines
dom, ago 23 - gio, set 3

Lufthansa flights from Seattle to Porto

Our best Lufthansa deals on Seattle to Porto flight tickets
Lufthansa
Nov 1
SEA2:50 pmSeattle/Tacoma Intl
14h 00m
1 stop
OPO12:50 pmPorto
Nov 20
OPO6:15 amPorto
14h 45m
1 stop
SEA1:00 pmSeattle/Tacoma Intl
$811
Lufthansa
Nov 8
SEA2:50 pmSeattle/Tacoma Intl
14h 00m
1 stop
OPO12:50 pmPorto
Nov 24
OPO1:45 pmPorto
31h 15m
1 stop
SEA1:00 pmSeattle/Tacoma Intl
$816
Lufthansa
Nov 11
SEA2:50 pmSeattle/Tacoma Intl
14h 00m
1 stop
OPO12:50 pmPorto
Nov 20
OPO6:00 amPorto
24h 29m
2 stops
SEA10:29 pmSeattle/Tacoma Intl
$820

Scandinavian Airlines flights from Seattle to Porto

Our best Scandinavian Airlines deals on Seattle to Porto flight tickets
Scandinavian Airlines
Nov 3
SEA7:20 amSeattle/Tacoma Intl
19h 45m
2 stops
OPO11:05 amPorto
Nov 19
OPO5:50 pmPorto
38h 28m
2 stops
SEA12:18 amSeattle/Tacoma Intl
$749
Scandinavian Airlines
Nov 1
SEA7:20 amSeattle/Tacoma Intl
19h 45m
2 stops
OPO11:05 amPorto
Nov 15
OPO5:35 pmPorto
36h 37m
2 stops
SEA10:12 pmSeattle/Tacoma Intl
$783
Scandinavian Airlines
Aug 25
SEA3:55 pmSeattle/Tacoma Intl
35h 05m
1 stop
OPO11:00 amPorto
Sep 10
OPO11:50 amPorto
33h 55m
1 stop
SEA1:45 pmSeattle/Tacoma Intl
$788

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 maggio 25, 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

mar 11/3

7:20 am-11:05 am

2 stops19h 45m

Porto

gio 11/19

5:50 pm-12:18 am

2 stops38h 28m

$749

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mar 9/8

3:40 pm-7:35 am

3 stops31h 55m

Porto

mar 9/22

7:10 am-8:40 pm

2 stops21h 30m

$757

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mer 11/4

6:50 pm-5:50 pm

1 stop15h 00m

Porto

mer 11/18

8:40 pm-10:15 pm

2 stops33h 35m

$771

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

lun 11/2

6:50 pm-8:00 pm

2 stops17h 10m

Porto

lun 11/16

9:55 pm-4:55 pm

2 stops27h 00m

$773

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mer 11/4

2:46 pm-5:50 pm

2 stops19h 04m

Porto

mer 11/18

8:40 pm-10:15 pm

2 stops33h 35m

$776

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

lun 11/9

5:24 am-8:00 pm

2 stops30h 36m

Porto

lun 11/23

8:40 pm-10:15 pm

2 stops33h 35m

$782

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

dom 11/1

7:20 am-11:05 am

2 stops19h 45m

Porto

dom 11/15

5:35 pm-10:12 pm

2 stops36h 37m

$783
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

mer 11/4

6:50 pm-5:50 pm

1 stop15h 00m

Porto

mer 11/18

6:35 pm-11:30 am

1 stop24h 55m

$787

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

lun 10/26

10:17 am-8:00 pm

2 stops26h 43m

Porto

gio 11/5

8:40 pm-11:05 pm

2 stops34h 25m

$788

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

dom 8/23

3:55 pm-10:00 pm

2 stops22h 05m

Porto

gio 9/3

11:50 am-1:45 pm

1 stop33h 55m

$793

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 $895 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 28% 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

15h 45m

Direct flights

None
The fastest flight from Seattle to Porto takes 15h 45m
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 15h 45m 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
1,521 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
8,029 reviews
Search Lufthansa flights
DeltaPriceFrom $582Free CancellationRating
7.9
8,426 reviews
Search Delta flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,749 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,090 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $665Free CancellationRating
7.4
4,395 reviews
Search Turkish Airlines flights
Air FrancePriceFrom $905Free CancellationRating
7.4
1,591 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
Lamego
Chaves
Esposende
Pinhao
Guimarães
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
Curia
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.

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