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Cheap flights from Seattle to Porto from $234

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 4/20. 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.
Lufthansa Logo
3:10 pm - 11:40 pm
SEA
-
OPO
24h 30m
1 stop
Lufthansa Logo
6:00 am - 7:03 pm
OPO
-
SEA
20h 03m
2 stops
$422Lufthansa
Wed, Mar 4 - Wed, Mar 11
Lufthansa Logo
3:10 pm - 11:40 pm
SEA
-
OPO
24h 30m
1 stop
Lufthansa Logo
6:30 am - 2:20 pm
OPO
-
SEA
14h 50m
1 stop
$427Lufthansa
Fri, Mar 6 - Fri, Mar 13
Multiple Airlines Logo
10:58 am - 11:15 am
SEA
-
OPO
40h 17m
2 stops
Multiple Airlines Logo
6:30 am - 1:20 pm
OPO
-
SEA
14h 50m
1 stop
$430Multiple Airlines
Sun, Feb 8 - Fri, Feb 20
Lufthansa Logo
2:00 pm - 10:25 pm
SEA
-
OPO
24h 25m
1 stop
Lufthansa Logo
6:00 am - 10:45 pm
OPO
-
SEA
24h 45m
2 stops
$443Lufthansa
Thu, Feb 19 - Thu, Mar 5
Lufthansa Logo
3:10 pm - 1:15 pm
SEA
-
OPO
14h 05m
1 stop
Lufthansa Logo
4:15 pm - 1:10 pm
OPO
-
SEA
27h 55m
1 stop
$449Lufthansa
Wed, Mar 4 - Wed, Mar 11
Lufthansa Logo
2:00 pm - 10:25 pm
SEA
-
OPO
24h 25m
1 stop
Lufthansa Logo
2:05 pm - 1:20 pm
OPO
-
SEA
31h 15m
1 stop
$455Lufthansa
Thu, Feb 19 - Thu, Mar 5
American Airlines Logo
8:04 am - 11:45 am
SEA
-
OPO
19h 41m
2 stops
American Airlines Logo
12:25 pm - 12:44 am
OPO
-
SEA
20h 19m
2 stops
$461American Airlines
Tue, Feb 3 - Fri, May 1
SWISS Logo
12:32 pm - 11:10 am
SEA
-
OPO
38h 38m
2 stops
SWISS Logo
7:20 pm - 10:45 pm
OPO
-
SEA
34h 25m
2 stops
$463SWISS
Wed, Mar 4 - Wed, Mar 11
Multiple Airlines Logo
10:10 am - 11:25 pm
SEA
-
OPO
29h 15m
2 stops
Multiple Airlines Logo
8:40 am - 10:20 pm
OPO
-
SEA
21h 40m
2 stops
$467Multiple Airlines
Mon, Apr 13 - Thu, May 7
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
$472Lufthansa
Wed, Mar 4 - Thu, Mar 12

Iberia flights from Seattle to Porto

Our best Iberia deals on Seattle to Porto flight tickets
Iberia
Feb 19
SEA5:37 amSeattle/Tacoma Intl
18h 03m
2 stops
OPO7:40 amPorto
Feb 24
OPO9:55 pmPorto
31h 22m
2 stops
SEA9:17 pmSeattle/Tacoma Intl
$483
Iberia
Jan 31
SEA8:35 amSeattle/Tacoma Intl
19h 10m
2 stops
OPO11:45 amPorto
Feb 7
OPO8:20 amPorto
22h 00m
2 stops
SEA10:20 pmSeattle/Tacoma Intl
$561

KLM flights from Seattle to Porto

Our best KLM deals on Seattle to Porto flight tickets
KLM
Feb 11
SEA3:05 pmSeattle/Tacoma Intl
20h 15m
1 stop
OPO7:20 pmPorto
Feb 20
OPO5:00 amPorto
14h 40m
1 stop
SEA11:40 amSeattle/Tacoma Intl
$578
KLM
Apr 23
SEA5:30 pmSeattle/Tacoma Intl
14h 00m
1 stop
OPO3:30 pmPorto
Apr 26
OPO7:00 pmPorto
24h 45m
1 stop
SEA11:45 amSeattle/Tacoma Intl
$582
KLM
Apr 23
SEA5:30 pmSeattle/Tacoma Intl
17h 45m
1 stop
OPO7:15 pmPorto
Apr 26
OPO7:00 pmPorto
24h 45m
1 stop
SEA11:45 amSeattle/Tacoma Intl
$583

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 22, 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-11:40 pm

1 stop24h 30m

Porto

Wed 3/11

6:00 am-7:03 pm

2 stops20h 03m

$422

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fri 3/6

3:10 pm-11:40 pm

1 stop24h 30m

Porto

Fri 3/13

6:30 am-2:20 pm

1 stop14h 50m

$427

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 2/8

10:58 am-11:15 am

2 stops40h 17m

Porto

Fri 2/20

6:30 am-1:20 pm

1 stop14h 50m

$430

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 2/19

2:00 pm-10:25 pm

1 stop24h 25m

Porto

Thu 3/5

6:00 am-10:45 pm

2 stops24h 45m

$443

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 3/4

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Wed 3/11

4:15 pm-1:10 pm

1 stop27h 55m

$449

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 2/19

2:00 pm-10:25 pm

1 stop24h 25m

Porto

Thu 3/5

2:05 pm-1:20 pm

1 stop31h 15m

$455

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/3

8:04 am-11:45 am

2 stops19h 41m

Porto

Fri 5/1

12:25 pm-12:44 am

2 stops20h 19m

$461

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 3/4

12:32 pm-11:10 am

2 stops38h 38m

Porto

Wed 3/11

7:20 pm-10:45 pm

2 stops34h 25m

$463

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 4/13

10:10 am-11:25 pm

2 stops29h 15m

Porto

Thu 5/7

8:40 am-10:20 pm

2 stops21h 40m

$467

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

$472

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 $696.

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 $951 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 $730 on momondo.

Can stopping save me money on Seattle to Porto flights?

You could potentially save up to 25% 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

19h 10m

Direct flights

None
The fastest flight from Seattle to Porto takes 19h 10m
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 19h 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
7.7
1,442 reviews
Search KLM flights
DeltaPriceFrom $588Free CancellationRating
7.9
8,087 reviews
Search Delta flights
LufthansaPriceFrom $619Free CancellationRating
6.8
7,740 reviews
Search Lufthansa flights
Turkish AirlinesPriceFrom $665Free CancellationRating
7.3
4,200 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $679Free CancellationRating
7.4
9,192 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
Espinho
Chaves
Pinhao
Arcos de Valdevez
Ponte de Lima
Viseu
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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