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Cheap flights from Seattle to Porto from $258

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 8/31. 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
8:00 am - 12:40 am
SEA
-
OPO
32h 40m
3 stops
Multiple Airlines Logo
7:10 pm - 6:32 pm
OPO
-
SEA
31h 22m
3 stops
$690Multiple Airlines
Sat, Sep 5 - Sat, Sep 12
Multiple Airlines Logo
5:40 pm - 9:20 pm
SEA
-
OPO
19h 40m
2 stops
Multiple Airlines Logo
10:00 pm - 4:00 pm
OPO
-
SEA
26h 00m
2 stops
$720Multiple Airlines
Sun, Oct 11 - Wed, Oct 21
Multiple Airlines Logo
7:00 pm - 12:40 am
SEA
-
OPO
21h 40m
3 stops
Multiple Airlines Logo
10:45 am - 8:40 pm
OPO
-
SEA
17h 55m
2 stops
$722Multiple Airlines
Wed, Aug 19 - Wed, Aug 26
Multiple Airlines Logo
7:00 pm - 10:55 pm
SEA
-
OPO
19h 55m
2 stops
Multiple Airlines Logo
6:15 am - 6:45 pm
OPO
-
SEA
44h 30m
3 stops
$734Multiple Airlines
Tue, Sep 8 - Tue, Sep 22
American Airlines Logo
5:24 am - 7:40 am
SEA
-
OPO
18h 16m
2 stops
American Airlines Logo
8:40 pm - 9:45 am
OPO
-
SEA
21h 05m
2 stops
$757American Airlines
Tue, Nov 10 - Mon, Nov 16
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
$759British Airways
Wed, Nov 11 - Tue, Nov 17
Multiple Airlines Logo
3:40 pm - 11:35 pm
SEA
-
OPO
23h 55m
2 stops
Multiple Airlines Logo
7:00 am - 9:40 am
OPO
-
SEA
34h 40m
3 stops
$762Multiple Airlines
Sun, Sep 13 - Thu, Sep 24
Multiple Airlines Logo
3:40 pm - 9:40 am
SEA
-
OPO
34h 00m
3 stops
Multiple Airlines Logo
10:40 pm - 9:04 pm
OPO
-
SEA
30h 24m
3 stops
$770Multiple Airlines
Sun, Aug 23 - Mon, Sep 21
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
$772Iberia
Mon, Nov 9 - Mon, Nov 23
Iberia Logo
5:24 am - 7:40 am
SEA
-
OPO
18h 16m
2 stops
Iberia Logo
8:40 pm - 9:18 pm
OPO
-
SEA
32h 38m
2 stops
$775Iberia
Tue, Nov 3 - Tue, Nov 10

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Iberia flights from Seattle to Porto

Our best Iberia deals on Seattle to Porto flight tickets
Iberia
Nov 9
SEA6:50 pmSeattle/Tacoma Intl
17h 10m
2 stops
OPO8:00 pmPorto
Nov 23
OPO9:55 pmPorto
27h 00m
2 stops
SEA4:55 pmSeattle/Tacoma Intl
$772
Iberia
Nov 3
SEA5:24 amSeattle/Tacoma Intl
18h 16m
2 stops
OPO7:40 amPorto
Nov 10
OPO8:40 pmPorto
32h 38m
2 stops
SEA9:18 pmSeattle/Tacoma Intl
$775
Iberia
Oct 14
SEA2:05 pmSeattle/Tacoma Intl
17h 55m
2 stops
OPO4:00 pmPorto
Oct 21
OPO8:20 amPorto
23h 54m
2 stops
SEA12:14 amSeattle/Tacoma Intl
$781

Lufthansa flights from Seattle to Porto

Our best Lufthansa deals on Seattle to Porto flight tickets
Lufthansa
Oct 14
SEA6:50 pmSeattle/Tacoma Intl
20h 35m
1 stop
OPO11:25 pmPorto
Oct 21
OPO6:20 amPorto
18h 39m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$809
Lufthansa
Oct 7
SEA6:50 pmSeattle/Tacoma Intl
20h 35m
1 stop
OPO11:25 pmPorto
Oct 15
OPO6:20 amPorto
18h 39m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$826
Lufthansa
Oct 7
SEA6:50 pmSeattle/Tacoma Intl
20h 35m
1 stop
OPO11:25 pmPorto
Oct 15
OPO6:20 amPorto
18h 39m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$827

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 June 24, 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

Sat 9/5

8:00 am-12:40 am

3 stops32h 40m

Porto

Sat 9/12

7:10 pm-6:32 pm

3 stops31h 22m

$690

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 10/11

5:40 pm-9:20 pm

2 stops19h 40m

Porto

Wed 10/21

10:00 pm-4:00 pm

2 stops26h 00m

$720

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 8/19

7:00 pm-12:40 am

3 stops21h 40m

Porto

Wed 8/26

10:45 am-8:40 pm

2 stops17h 55m

$722

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 9/8

7:00 pm-10:55 pm

2 stops19h 55m

Porto

Tue 9/22

6:15 am-6:45 pm

3 stops44h 30m

$734
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 11/10

5:24 am-7:40 am

2 stops18h 16m

Porto

Mon 11/16

8:40 pm-9:45 am

2 stops21h 05m

$757

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 11/11

6:50 pm-5:50 pm

1 stop15h 00m

Porto

Tue 11/17

8:40 pm-10:15 pm

2 stops33h 35m

$759

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 9/13

3:40 pm-11:35 pm

2 stops23h 55m

Porto

Thu 9/24

7:00 am-9:40 am

3 stops34h 40m

$762

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 8/23

3:40 pm-9:40 am

3 stops34h 00m

Porto

Mon 9/21

10:40 pm-9:04 pm

3 stops30h 24m

$770

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/9

6:50 pm-8:00 pm

2 stops17h 10m

Porto

Mon 11/23

9:55 pm-4:55 pm

2 stops27h 00m

$772

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 11/3

5:24 am-7:40 am

2 stops18h 16m

Porto

Tue 11/10

8:40 pm-9:18 pm

2 stops32h 38m

$775

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 $902 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 51% 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 10m

Direct flights

None
The fastest flight from Seattle to Porto takes 17h 10m
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 10m 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
1,530 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
8,092 reviews
Search Lufthansa flights
DeltaPriceFrom $588Free CancellationRating
7.8
8,433 reviews
Search Delta flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,884 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,251 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $685Free CancellationRating
7.4
4,414 reviews
Search Turkish Airlines flights
Air FrancePriceFrom $905Free CancellationRating
7.5
1,614 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
Guimarães
Arcos de Valdevez
Espinho
Ponte de Lima
Viseu
Curia
Mesao Frio
Penafiel
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

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