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Cheap flights from Seattle to Porto from $322

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.
Iberia Logo
6:45 pm - 8:00 pmSEA  Seattle/Tacoma Intl-OPO Porto
17h 15m2 stops London Heathrow Madrid Barajas
Iberia Logo
8:40 pm - 4:50 pmOPO  Porto-SEA Seattle/Tacoma Intl
28h 10m2 stops Madrid Barajas London Heathrow
$780Iberia
Mon, Jan 11 - Mon, Jan 25
Multiple Airlines Logo
2:35 pm - 8:10 amSEA  Seattle/Tacoma Intl-OPO Porto
33h 35m3 stops Reykjavik Keflavik Intl Brussels Bruxelles-National Barcelona-El Prat
Multiple Airlines Logo
4:00 pm - 5:00 pmOPO  Porto-SEA Seattle/Tacoma Intl
33h 00m3 stops Lisbon Humberto Delgado Brussels Bruxelles-National Reykjavik Keflavik Intl
$795Multiple Airlines
Sat, Nov 14 - Sat, Nov 21
Lufthansa Logo
7:00 am - 11:45 amSEA  Seattle/Tacoma Intl-OPO Porto
21h 45m2 stops Chicago O'Hare Intl Frankfurt am Main
Lufthansa Logo
1:45 pm - 1:00 pmOPO  Porto-SEA Seattle/Tacoma Intl
31h 15m1 stop Munich Franz Josef Strauss
$808Lufthansa
Tue, Oct 27 - Tue, Nov 3
Air France Logo
5:05 pm - 10:00 pmSEA  Seattle/Tacoma Intl-OPO Porto
21h 55m1 stop Paris Charles de Gaulle
Air France Logo
5:55 am - 1:50 pmOPO  Porto-SEA Seattle/Tacoma Intl
15h 55m1 stop Paris Charles de Gaulle
$810Air France
Tue, Oct 27 - Tue, Nov 3
Air Canada Logo
3:00 pm - 7:00 amSEA  Seattle/Tacoma Intl-OPO Porto
56h 00m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
8:40 am - 6:32 pmOPO  Porto-SEA Seattle/Tacoma Intl
17h 52m2 stops Zurich Vancouver Intl
$819Air Canada
Sun, Oct 11 - Wed, Oct 21
Air Canada Logo
7:20 pm - 7:00 amSEA  Seattle/Tacoma Intl-OPO Porto
51h 40m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
8:40 am - 6:32 pmOPO  Porto-SEA Seattle/Tacoma Intl
17h 52m2 stops Zurich Vancouver Intl
$819Air Canada
Sun, Oct 11 - Wed, Oct 21
United Airlines Logo
7:00 am - 9:45 amSEA  Seattle/Tacoma Intl-OPO Porto
18h 45m1 stop Newark
United Airlines Logo
6:00 am - 7:03 pmOPO  Porto-SEA Seattle/Tacoma Intl
20h 03m2 stops Frankfurt am Main Chicago O'Hare Intl
$820United Airlines
Mon, Oct 19 - Wed, Oct 28
Lufthansa Logo
7:00 am - 10:20 amSEA  Seattle/Tacoma Intl-OPO Porto
19h 20m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss
Lufthansa Logo
6:20 am - 4:59 pmOPO  Porto-SEA Seattle/Tacoma Intl
18h 39m1 stop Munich Franz Josef Strauss
$824Lufthansa
Wed, Oct 7 - Thu, Oct 15
United Airlines Logo
5:00 am - 6:50 amSEA  Seattle/Tacoma Intl-OPO Porto
17h 50m2 stops Denver Intl Montreal Pierre Elliott Trudeau Intl
United Airlines Logo
6:00 am - 7:03 pmOPO  Porto-SEA Seattle/Tacoma Intl
20h 03m2 stops Frankfurt am Main Chicago O'Hare Intl
$824United Airlines
Mon, Oct 19 - Wed, Oct 28
Air France Logo
7:20 am - 10:35 amSEA  Seattle/Tacoma Intl-OPO Porto
19h 15m2 stops Boston Logan Intl Paris Charles de Gaulle
Air France Logo
5:55 am - 3:13 pmOPO  Porto-SEA Seattle/Tacoma Intl
17h 18m1 stop Paris Charles de Gaulle
$864Air France
Fri, Dec 11 - Fri, Dec 25

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Iberia flights from Seattle to Porto

Our best Iberia deals on Seattle to Porto flight tickets
Iberia
Jan 11
SEA6:45 pmSeattle/Tacoma Intl
17h 15m
2 stops
OPO8:00 pmPorto
Jan 25
OPO8:40 pmPorto
28h 10m
2 stops
SEA4:50 pmSeattle/Tacoma Intl
$780
Iberia
Oct 27
SEA10:31 amSeattle/Tacoma Intl
18h 14m
2 stops
OPO11:45 amPorto
Nov 3
OPO8:20 amPorto
24h 15m
2 stops
SEA12:35 amSeattle/Tacoma Intl
$799
Iberia
Nov 14
SEA10:34 amSeattle/Tacoma Intl
21h 26m
2 stops
OPO4:00 pmPorto
Nov 21
OPO8:40 pmPorto
31h 45m
2 stops
SEA8:25 pmSeattle/Tacoma Intl
$849

Lufthansa flights from Seattle to Porto

Our best Lufthansa deals on Seattle to Porto flight tickets
Lufthansa
Oct 27
SEA7:00 amSeattle/Tacoma Intl
21h 45m
2 stops
OPO11:45 amPorto
Nov 3
OPO1:45 pmPorto
31h 15m
1 stop
SEA1:00 pmSeattle/Tacoma Intl
$808
Lufthansa
Oct 7
SEA7:00 amSeattle/Tacoma Intl
19h 20m
2 stops
OPO10:20 amPorto
Oct 15
OPO6:20 amPorto
18h 39m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$824
Lufthansa
Oct 7
SEA7:00 amSeattle/Tacoma Intl
19h 20m
2 stops
OPO10:20 amPorto
Oct 15
OPO6:20 amPorto
18h 39m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$825

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 10, 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

Mon 1/11

6:45 pm-8:00 pm

2 stops17h 15m

Porto

Mon 1/25

8:40 pm-4:50 pm

2 stops28h 10m

$780

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sat 11/14

2:35 pm-8:10 am

3 stops33h 35m

Porto

Sat 11/21

4:00 pm-5:00 pm

3 stops33h 00m

$795

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 10/27

7:00 am-11:45 am

2 stops21h 45m

Porto

Tue 11/3

1:45 pm-1:00 pm

1 stop31h 15m

$808

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 10/27

5:05 pm-10:00 pm

1 stop21h 55m

Porto

Tue 11/3

5:55 am-1:50 pm

1 stop15h 55m

$810

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 10/11

3:00 pm-7:00 am

2 stops56h 00m

Porto

Wed 10/21

8:40 am-6:32 pm

2 stops17h 52m

$819

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 10/11

7:20 pm-7:00 am

2 stops51h 40m

Porto

Wed 10/21

8:40 am-6:32 pm

2 stops17h 52m

$819

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 10/19

7:00 am-9:45 am

1 stop18h 45m

Porto

Wed 10/28

6:00 am-7:03 pm

2 stops20h 03m

$820

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 10/7

7:00 am-10:20 am

2 stops19h 20m

Porto

Thu 10/15

6:20 am-4:59 pm

1 stop18h 39m

$824

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 10/19

5:00 am-6:50 am

2 stops17h 50m

Porto

Wed 10/28

6:00 am-7:03 pm

2 stops20h 03m

$824
Quickest round-trip

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Fri 12/11

7:20 am-10:35 am

2 stops19h 15m

Porto

Fri 12/25

5:55 am-3:13 pm

1 stop17h 18m

$864

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 $780.

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

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
1,555 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
8,174 reviews
Search Lufthansa flights
DeltaPriceFrom $588Free CancellationRating
7.8
8,497 reviews
Search Delta flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
10,095 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,458 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $692Free CancellationRating
7.4
4,479 reviews
Search Turkish Airlines flights
Air FrancePriceFrom $905Free CancellationRating
7.5
1,639 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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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