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Cheap flights from Seattle to Porto from $273

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.
Multiple Airlines Logo
3:55 pm - 10:40 am-
34h 45m
Multiple Airlines Logo
8:55 pm - 1:45 pm-
24h 50m
$795Multiple Airlines
Sun, Sep 20 - Mon, Oct 5
British Airways Logo
1:40 pm - 5:15 pm-
19h 35m
British Airways Logo
8:40 pm - 11:51 pm-
35h 11m
$796British Airways
Thu, Jan 14 - Tue, Jan 19
Air Canada Logo
5:40 am - 6:50 am-
17h 10m
Air Canada Logo
6:00 am - 2:37 pm-
16h 37m
$800Air Canada
Mon, Oct 19 - Thu, Nov 5
Air Canada Logo
5:40 am - 7:00 am-
17h 20m
Air Canada Logo
6:00 am - 6:22 pm-
20h 22m
$800Air Canada
Tue, Oct 20 - Fri, Nov 6
Delta Logo
3:25 pm - 10:00 pm-
22h 35m
Delta Logo
5:00 am - 11:47 am-
14h 47m
$802Delta
Sun, Nov 1 - Wed, Nov 18
Delta Logo
3:25 pm - 10:00 pm-
22h 35m
Delta Logo
5:00 am - 11:50 am-
14h 50m
$802Delta
Mon, Jan 11 - Wed, Jan 20
United Airlines Logo
8:30 am - 9:30 am-
17h 00m
United Airlines Logo
12:35 pm - 12:00 pm-
31h 25m
$821United Airlines
Tue, Nov 3 - Tue, Nov 10
Lufthansa Logo
6:50 pm - 11:25 pm-
20h 35m
Lufthansa Logo
6:20 am - 4:59 pm-
18h 39m
$824Lufthansa
Sun, Sep 20 - Tue, Oct 6
Lufthansa Logo
3:00 pm - 6:50 am-
31h 50m
Lufthansa Logo
6:15 am - 2:00 pm-
14h 45m
$824Lufthansa
Sun, Oct 18 - Fri, Oct 30
United Airlines Logo
7:00 am - 9:45 am-
18h 45m
United Airlines Logo
6:00 am - 11:07 pm-
24h 07m
$829United Airlines
Sun, Oct 18 - Wed, Oct 28

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Delta flights from Seattle to Porto

Our best Delta deals on Seattle to Porto flight tickets
Delta
Oct 26
SEA4:20 pmSeattle/Tacoma Intl
22h 40m
1 stop
OPO10:00 pmPorto
Nov 4
OPO5:00 amPorto
14h 47m
1 stop
SEA11:47 amSeattle/Tacoma Intl
$802
Delta
Jan 13
SEA3:25 pmSeattle/Tacoma Intl
35h 10m
1 stop
OPO10:35 amPorto
Jan 21
OPO11:15 amPorto
32h 35m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$803
Delta
Jan 11
SEA9:55 pmSeattle/Tacoma Intl
28h 40m
2 stops
OPO10:35 amPorto
Jan 19
OPO11:15 amPorto
32h 35m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$806

Air Canada flights from Seattle to Porto

Our best Air Canada deals on Seattle to Porto flight tickets
Air Canada
Oct 17
SEA7:20 pmSeattle/Tacoma Intl
38h 55m
2 stops
OPO6:15 pmPorto
Nov 4
OPO6:00 amPorto
16h 37m
2 stops
SEA2:37 pmSeattle/Tacoma Intl
$805
Air Canada
Nov 2
SEA7:05 pmSeattle/Tacoma Intl
32h 40m
2 stops
OPO11:45 amPorto
Nov 11
OPO6:00 amPorto
16h 37m
2 stops
SEA2:37 pmSeattle/Tacoma Intl
$815
Air Canada
Oct 12
SEA7:20 pmSeattle/Tacoma Intl
27h 40m
2 stops
OPO7:00 amPorto
Oct 22
OPO6:00 amPorto
20h 32m
2 stops
SEA6:32 pmSeattle/Tacoma Intl
$818

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 5, 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 9/20

3:55 pm-10:40 am

2 stops34h 45m

Porto

Mon 10/5

8:55 pm-1:45 pm

1 stop24h 50m

$795

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 1/14

1:40 pm-5:15 pm

1 stop19h 35m

Porto

Tue 1/19

8:40 pm-11:51 pm

2 stops35h 11m

$796
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 10/19

5:40 am-6:50 am

2 stops17h 10m

Porto

Thu 11/5

6:00 am-2:37 pm

2 stops16h 37m

$800

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 10/20

5:40 am-7:00 am

2 stops17h 20m

Porto

Fri 11/6

6:00 am-6:22 pm

2 stops20h 22m

$800

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 11/1

3:25 pm-10:00 pm

1 stop22h 35m

Porto

Wed 11/18

5:00 am-11:47 am

1 stop14h 47m

$802

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 1/11

3:25 pm-10:00 pm

1 stop22h 35m

Porto

Wed 1/20

5:00 am-11:50 am

1 stop14h 50m

$802

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 11/3

8:30 am-9:30 am

2 stops17h 00m

Porto

Tue 11/10

12:35 pm-12:00 pm

1 stop31h 25m

$821

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 9/20

6:50 pm-11:25 pm

1 stop20h 35m

Porto

Tue 10/6

6:20 am-4:59 pm

1 stop18h 39m

$824

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 10/18

3:00 pm-6:50 am

2 stops31h 50m

Porto

Fri 10/30

6:15 am-2:00 pm

1 stop14h 45m

$824

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 10/18

7:00 am-9:45 am

1 stop18h 45m

Porto

Wed 10/28

6:00 am-11:07 pm

2 stops24h 07m

$829

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 $795.

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

14h 00m

Direct flights

None
The fastest flight from Seattle to Porto takes 14h 00m
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 14h 00m 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
1,553 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
8,176 reviews
Search Lufthansa flights
DeltaPriceFrom $588Free CancellationRating
7.8
8,490 reviews
Search Delta flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
10,058 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,428 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $692Free CancellationRating
7.4
4,466 reviews
Search Turkish Airlines flights
Air FrancePriceFrom $905Free CancellationRating
7.5
1,634 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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