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Cheap flights from Seattle to Porto from $239

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 3/29. 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.
Lufthansa Logo
3:10 pm - 1:15 pm
SEA
-
OPO
14h 05m
1 stop
Lufthansa Logo
6:00 am - 7:03 pm
OPO
-
SEA
20h 03m
2 stops
$419Lufthansa
Wed, Mar 4 - Thu, Mar 12
Lufthansa Logo
3:10 pm - 1:15 pm
SEA
-
OPO
14h 05m
1 stop
Lufthansa Logo
6:00 am - 7:03 pm
OPO
-
SEA
20h 03m
2 stops
$420Lufthansa
Wed, Mar 4 - Thu, Mar 12
Lufthansa Logo
3:10 pm - 11:40 pm
SEA
-
OPO
24h 30m
1 stop
Lufthansa Logo
6:00 am - 7:03 pm
OPO
-
SEA
21h 03m
2 stops
$428Lufthansa
Fri, Feb 20 - Fri, Feb 27
Multiple Airlines Logo
12:32 pm - 6:30 pm
SEA
-
OPO
21h 58m
2 stops
Multiple Airlines Logo
1:45 pm - 1:20 pm
OPO
-
SEA
31h 35m
1 stop
$432Multiple Airlines
Tue, Feb 24 - Tue, Mar 3
Lufthansa Logo
3:10 pm - 1:15 pm
SEA
-
OPO
14h 05m
1 stop
Lufthansa Logo
2:05 pm - 2:20 pm
OPO
-
SEA
31h 15m
1 stop
$433Lufthansa
Wed, Mar 4 - Thu, Mar 12
United Airlines Logo
11:35 pm - 9:30 am
SEA
-
OPO
25h 55m
1 stop
United Airlines Logo
12:45 pm - 10:53 pm
OPO
-
SEA
18h 08m
1 stop
$437United Airlines
Sat, Feb 21 - Fri, Mar 6
British Airways Logo
1:37 pm - 4:45 pm
SEA
-
OPO
19h 08m
2 stops
British Airways Logo
8:20 am - 12:24 am
OPO
-
SEA
23h 04m
2 stops
$441British Airways
Wed, Mar 4 - Thu, Mar 12
United Airlines Logo
9:00 am - 9:30 am
SEA
-
OPO
16h 30m
2 stops
United Airlines Logo
12:35 pm - 11:49 am
OPO
-
SEA
31h 14m
2 stops
$450United Airlines
Tue, Feb 24 - Tue, Mar 3
British Airways Logo
10:25 am - 7:05 pm
SEA
-
OPO
24h 40m
2 stops
British Airways Logo
8:40 pm - 6:30 pm
OPO
-
SEA
29h 50m
2 stops
$459British Airways
Wed, Apr 29 - Tue, May 12
Lufthansa Logo
3:10 pm - 1:15 pm
SEA
-
OPO
14h 05m
1 stop
Lufthansa Logo
6:30 am - 1:20 pm
OPO
-
SEA
14h 50m
1 stop
$462Lufthansa
Wed, Feb 18 - Fri, Feb 27

Delta flights from Seattle to Porto

Our best Delta deals on Seattle to Porto flight tickets
Delta
Feb 18
SEA7:10 amSeattle/Tacoma Intl
19h 20m
2 stops
OPO10:30 amPorto
Feb 27
OPO5:00 amPorto
21h 49m
2 stops
SEA6:49 pmSeattle/Tacoma Intl
$481
Delta
Feb 19
SEA7:25 amSeattle/Tacoma Intl
24h 00m
2 stops
OPO3:25 pmPorto
Feb 26
OPO5:00 amPorto
14h 40m
1 stop
SEA11:40 amSeattle/Tacoma Intl
$487
Delta
Apr 25
SEA6:40 pmSeattle/Tacoma Intl
19h 20m
1 stop
OPO10:00 pmPorto
May 5
OPO6:15 amPorto
19h 24m
1 stop
SEA5:39 pmSeattle/Tacoma Intl
$515

Lufthansa flights from Seattle to Porto

Our best Lufthansa deals on Seattle to Porto flight tickets
Lufthansa
Mar 4
SEA3:10 pmSeattle/Tacoma Intl
14h 05m
1 stop
OPO1:15 pmPorto
Mar 12
OPO6:00 amPorto
20h 03m
2 stops
SEA7:03 pmSeattle/Tacoma Intl
$419
Lufthansa
Mar 4
SEA3:10 pmSeattle/Tacoma Intl
14h 05m
1 stop
OPO1:15 pmPorto
Mar 12
OPO6:00 amPorto
20h 03m
2 stops
SEA7:03 pmSeattle/Tacoma Intl
$420
Lufthansa
Feb 20
SEA3:10 pmSeattle/Tacoma Intl
24h 30m
1 stop
OPO11:40 pmPorto
Feb 27
OPO6:00 amPorto
21h 03m
2 stops
SEA7:03 pmSeattle/Tacoma Intl
$428

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 January 12, 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

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 3/4

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Thu 3/12

6:00 am-7:03 pm

2 stops20h 03m

$419

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 3/4

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Thu 3/12

6:00 am-7:03 pm

2 stops20h 03m

$420

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fri 2/20

3:10 pm-11:40 pm

1 stop24h 30m

Porto

Fri 2/27

6:00 am-7:03 pm

2 stops21h 03m

$428

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

12:32 pm-6:30 pm

2 stops21h 58m

Porto

Tue 3/3

1:45 pm-1:20 pm

1 stop31h 35m

$432

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 3/4

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Thu 3/12

2:05 pm-2:20 pm

1 stop31h 15m

$433

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 2/21

11:35 pm-9:30 am

1 stop25h 55m

Porto

Fri 3/6

12:45 pm-10:53 pm

1 stop18h 08m

$437

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 3/4

1:37 pm-4:45 pm

2 stops19h 08m

Porto

Thu 3/12

8:20 am-12:24 am

2 stops23h 04m

$441

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

9:00 am-9:30 am

2 stops16h 30m

Porto

Tue 3/3

12:35 pm-11:49 am

2 stops31h 14m

$450

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 4/29

10:25 am-7:05 pm

2 stops24h 40m

Porto

Tue 5/12

8:40 pm-6:30 pm

2 stops29h 50m

$459

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 2/18

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Fri 2/27

6:30 am-1:20 pm

1 stop14h 50m

$462

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 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 $485. 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 $697.

How far in advance should I book a flight 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 $955 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 $739 on momondo.

Can stopping save me money on Seattle to Porto flights?

You could potentially save up to 11% 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 05m

Direct flights

None
The fastest flight from Seattle to Porto takes 14h 05m
There are no direct flights from Seattle to Porto. There are no popular flight routes from Seattle to Porto.
Search flight deals

  • 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 05m 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 $543Free CancellationRating
7.7
1,437 reviews
Search KLM flights
DeltaPriceFrom $588Free CancellationRating
7.9
8,039 reviews
Search Delta flights
LufthansaPriceFrom $619Free CancellationRating
6.8
7,709 reviews
Search Lufthansa flights
Turkish AirlinesPriceFrom $665Free CancellationRating
7.3
4,155 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $679Free CancellationRating
7.4
9,149 reviews
Search United Airlines 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
Matosinhos
Aveiro
Esposende
Lamego
Guimarães
Chaves
Espinho
Viseu
Pinhao
Arcos de Valdevez
Ponte de Lima
Curia
Penafiel
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.

An easier way to manage your Porto trip

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