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Cheap flights from Seattle to Porto from $241

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 5/3. 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 05m1 stop
Lufthansa Logo
6:00 am - 6:14 pm
OPO
-
SEA
20h 14m2 stops
$427Lufthansa
Mi, Feb 4 - Mi, Feb 11
Lufthansa Logo
3:10 pm - 12:50 pm
SEA
-
OPO
13h 40m1 stop
Lufthansa Logo
6:30 am - 1:20 pm
OPO
-
SEA
14h 50m1 stop
$439Lufthansa
Fr, Jan 30 - Fr, Feb 13
Lufthansa Logo
3:10 pm - 1:15 pm
SEA
-
OPO
14h 05m1 stop
Lufthansa Logo
4:15 pm - 12:10 pm
OPO
-
SEA
27h 55m1 stop
$457Lufthansa
Mi, Feb 4 - Mi, Feb 11
Lufthansa Logo
2:00 pm - 10:25 pm
SEA
-
OPO
24h 25m1 stop
Lufthansa Logo
1:45 pm - 1:20 pm
OPO
-
SEA
31h 35m1 stop
$459Lufthansa
Sa, Jan 24 - Sa, Jan 31
Lufthansa Logo
2:00 pm - 10:25 pm
SEA
-
OPO
24h 25m1 stop
Lufthansa Logo
12:30 pm - 1:20 pm
OPO
-
SEA
32h 50m2 stops
$477Lufthansa
Sa, Jan 24 - Sa, Jan 31
United Airlines Logo
11:35 pm - 9:30 am
SEA
-
OPO
25h 55m1 stop
United Airlines Logo
6:00 am - 12:59 am
OPO
-
SEA
26h 59m2 stops
$478United Airlines
Sa, Feb 21 - Fr, Mrz 6
Delta Logo
1:40 pm - 10:30 am
SEA
-
OPO
12h 50m1 stop
Delta Logo
5:00 am - 11:35 am
OPO
-
SEA
14h 35m1 stop
$479Delta
Sa, Feb 21 - Fr, Mrz 6
Multiple Airlines Logo
2:10 pm - 10:25 am
SEA
-
OPO
36h 15m1 stop
Multiple Airlines Logo
11:15 am - 12:35 pm
OPO
-
SEA
32h 20m1 stop
$480Multiple Airlines
Mi, Mrz 4 - Mi, Mrz 11
Multiple Airlines Logo
7:10 am - 10:30 am
SEA
-
OPO
19h 20m2 stops
Multiple Airlines Logo
11:15 am - 11:40 am
OPO
-
SEA
32h 25m1 stop
$483Multiple Airlines
Mo, Feb 9 - Mo, Feb 16
Multiple Airlines Logo
7:40 am - 10:30 am
SEA
-
OPO
18h 50m2 stops
Multiple Airlines Logo
5:00 am - 4:54 pm
OPO
-
SEA
19h 54m2 stops
$493Multiple Airlines
Sa, Jan 24 - Sa, Jan 31

British Airways flights from Seattle to Porto

Our best British Airways deals on Seattle to Porto flight tickets
British Airways
May 12
SEA1:35 pmSeattle/Tacoma Intl
35h 30m
1 stop
OPO9:05 amPorto
May 27
OPO8:20 pmPorto
23h 15m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$735
Find similar
British Airways
May 8
SEA3:57 pmSeattle/Tacoma Intl
44h 38m
2 stops
OPO8:35 pmPorto
May 23
OPO8:00 pmPorto
31h 20m
2 stops
SEA7:20 pmSeattle/Tacoma Intl
$823
Find similar
British Airways
May 8
SEA3:57 pmSeattle/Tacoma Intl
44h 38m
2 stops
OPO8:35 pmPorto
May 23
OPO8:00 pmPorto
23h 35m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$826
Find similar

Delta flights from Seattle to Porto

Our best Delta deals on Seattle to Porto flight tickets
Delta
Feb 21
SEA1:40 pmSeattle/Tacoma Intl
12h 50m
1 stop
OPO10:30 amPorto
Mar 6
OPO5:00 amPorto
14h 35m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$479
Find similar
Delta
Jan 25
SEA3:10 pmSeattle/Tacoma Intl
23h 15m
1 stop
OPO10:25 pmPorto
Feb 1
OPO5:00 amPorto
21h 58m
2 stops
SEA6:58 pmSeattle/Tacoma Intl
$495
Find similar
Delta
Apr 6
SEA6:40 pmSeattle/Tacoma Intl
19h 50m
1 stop
OPO10:30 pmPorto
Apr 22
OPO5:00 amPorto
21h 39m
2 stops
SEA6:39 pmSeattle/Tacoma Intl
$558
Find similar

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 Dezember 28, 2025.
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

Mi 2/4

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Mi 2/11

6:00 am-6:14 pm

2 stops20h 14m

$427

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fr 1/30

3:10 pm-12:50 pm

1 stop13h 40m

Porto

Fr 2/13

6:30 am-1:20 pm

1 stop14h 50m

$439

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mi 2/4

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Mi 2/11

4:15 pm-12:10 pm

1 stop27h 55m

$457

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sa 1/24

2:00 pm-10:25 pm

1 stop24h 25m

Porto

Sa 1/31

1:45 pm-1:20 pm

1 stop31h 35m

$459

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sa 1/24

2:00 pm-10:25 pm

1 stop24h 25m

Porto

Sa 1/31

12:30 pm-1:20 pm

2 stops32h 50m

$477

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sa 2/21

11:35 pm-9:30 am

1 stop25h 55m

Porto

Fr 3/6

6:00 am-12:59 am

2 stops26h 59m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sa 2/21

1:40 pm-10:30 am

1 stop12h 50m

Porto

Fr 3/6

5:00 am-11:35 am

1 stop14h 35m

$479

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mi 3/4

2:10 pm-10:25 am

1 stop36h 15m

Porto

Mi 3/11

11:15 am-12:35 pm

1 stop32h 20m

$480

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mo 2/9

7:10 am-10:30 am

2 stops19h 20m

Porto

Mo 2/16

11:15 am-11:40 am

1 stop32h 25m

$483

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sa 1/24

7:40 am-10:30 am

2 stops18h 50m

Porto

Sa 1/31

5:00 am-4:54 pm

2 stops19h 54m

$493

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 $645. If you aren’t able to travel during the month of January, then book flights to Porto from Seattle during October instead. Flights to Porto in October, while not as cheap as those in January, still average around $730.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Tuesday when prices can be found for as low as $1,008. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $1,286. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

In the evening is the cheapest time of day to fly from Seattle to Porto when you can find flight prices for as low as $837. Flying to Porto in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $1,130 on average. Flights to Porto from Seattle in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $978 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 21% on your flight if you consider stops on a Seattle to Porto flight.

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
DeltaPriceFrom $588Free CancellationRating
7.9
8,021 reviews
Search Delta flights
LufthansaPriceFrom $619Free CancellationRating
6.8
7,657 reviews
Search Lufthansa flights
KLMPriceFrom $659Free CancellationRating
7.7
1,435 reviews
Search KLM flights
Turkish AirlinesPriceFrom $665Free CancellationRating
7.3
4,123 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $679Free CancellationRating
7.4
9,116 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
Aveiro
Matosinhos
Guimarães
Esposende
Lamego
Chaves
Viseu
Espinho
Arcos de Valdevez
Pinhao
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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