Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Seattle to Porto from $282

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 11/28. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Seattle to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
1:40 pm - 2:35 pmSEA-OPO
16h 55m1 stop
Multiple Airlines Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$477Multiple Airlines
Find Deal
Thu, Jan 1 - Thu, Jan 15
KLM Logo
1:40 pm - 10:30 amSEA-OPO
12h 50m1 stop
KLM Logo
4:10 pm - 11:50 amOPO-SEA
27h 40m1 stop
$478KLM
Find Deal
Tue, Jan 13 - Tue, Jan 20
Delta Logo
2:10 pm - 10:30 amSEA-OPO
36h 20m1 stop
Delta Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$479Delta
Find Deal
Mon, Jan 12 - Wed, Jan 21
KLM Logo
9:25 am - 10:30 amSEA-OPO
17h 05m2 stops
KLM Logo
4:10 pm - 11:50 amOPO-SEA
27h 40m1 stop
$482KLM
Find Deal
Tue, Jan 13 - Tue, Jan 20
Delta Logo
3:10 pm - 10:30 amSEA-OPO
35h 20m1 stop
Delta Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$483Delta
Find Deal
Thu, Jan 22 - Mon, Jan 26
Lufthansa Logo
3:10 pm - 1:15 pmSEA-OPO
14h 05m1 stop
Lufthansa Logo
6:00 am - 10:43 pmOPO-SEA
24h 43m2 stops
$487Lufthansa
Find Deal
Wed, Jan 7 - Sun, Jan 18
Lufthansa Logo
3:10 pm - 1:15 pmSEA-OPO
14h 05m1 stop
Lufthansa Logo
6:00 am - 6:14 pmOPO-SEA
20h 14m2 stops
$488Lufthansa
Find Deal
Wed, Jan 14 - Sat, Jan 24
Multiple Airlines Logo
12:35 pm - 11:15 amSEA-OPO
38h 40m2 stops
Multiple Airlines Logo
6:00 am - 10:16 pmOPO-SEA
24h 16m2 stops
$490Multiple Airlines
Find Deal
Fri, Jan 9 - Fri, Jan 16
Air Canada Logo
8:10 am - 1:15 pmSEA-OPO
21h 05m2 stops
Air Canada Logo
6:00 am - 10:16 pmOPO-SEA
24h 16m2 stops
$491Air Canada
Find Deal
Wed, Jan 14 - Thu, Jan 22
KLM Logo
9:25 am - 10:30 amSEA-OPO
17h 05m2 stops
KLM Logo
6:05 am - 8:00 pmOPO-SEA
21h 55m2 stops
$492KLM
Find Deal
Tue, Jan 13 - Tue, Jan 20

Turkish Airlines flights from Seattle to Porto

Our best Turkish Airlines deals on Seattle to Porto flight tickets
Turkish Airlines
Apr 15
SEA7:10 pmSeattle/Tacoma Intl
30h 30m
1 stop
OPO9:40 amPorto
May 1
OPO10:40 amPorto
38h 35m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$688
Find similar
Turkish Airlines
May 13
SEA7:10 pmSeattle/Tacoma Intl
36h 30m
1 stop
OPO3:40 pmPorto
May 29
OPO10:40 amPorto
38h 35m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$714
Find similar
Turkish Airlines
May 13
SEA7:10 pmSeattle/Tacoma Intl
36h 30m
1 stop
OPO3:40 pmPorto
May 29
OPO10:40 amPorto
38h 35m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$715
Find similar

Delta flights from Seattle to Porto

Our best Delta deals on Seattle to Porto flight tickets
Delta
Jan 22
SEA9:55 pmSeattle/Tacoma Intl
28h 35m
2 stops
OPO10:30 amPorto
Jan 26
OPO11:15 amPorto
32h 35m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$482
Find similar
Delta
Jan 22
SEA3:10 pmSeattle/Tacoma Intl
16h 15m
1 stop
OPO3:25 pmPorto
Jan 26
OPO11:15 amPorto
32h 35m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$483
Find similar
Delta
Jan 22
SEA9:55 pmSeattle/Tacoma Intl
28h 35m
2 stops
OPO10:30 amPorto
Jan 26
OPO11:25 amPorto
31h 54m
2 stops
SEA11:19 amSeattle/Tacoma Intl
$503
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 November 20, 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

Thu 1/1

1:40 pm-2:35 pm

1 stop16h 55m

Porto

Thu 1/15

11:15 am-11:50 am

1 stop32h 35m

$477

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/13

1:40 pm-10:30 am

1 stop12h 50m

Porto

Tue 1/20

4:10 pm-11:50 am

1 stop27h 40m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 1/12

2:10 pm-10:30 am

1 stop36h 20m

Porto

Wed 1/21

11:15 am-11:50 am

1 stop32h 35m

$479

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/13

9:25 am-10:30 am

2 stops17h 05m

Porto

Tue 1/20

4:10 pm-11:50 am

1 stop27h 40m

$482

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 1/22

3:10 pm-10:30 am

1 stop35h 20m

Porto

Mon 1/26

11:15 am-11:50 am

1 stop32h 35m

$483

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 1/7

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Sun 1/18

6:00 am-10:43 pm

2 stops24h 43m

$487

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 1/14

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Sat 1/24

6:00 am-6:14 pm

2 stops20h 14m

$488

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Fri 1/9

12:35 pm-11:15 am

2 stops38h 40m

Porto

Fri 1/16

6:00 am-10:16 pm

2 stops24h 16m

$490

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 1/14

8:10 am-1:15 pm

2 stops21h 05m

Porto

Thu 1/22

6:00 am-10:16 pm

2 stops24h 16m

$491

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/13

9:25 am-10:30 am

2 stops17h 05m

Porto

Tue 1/20

6:05 am-8:00 pm

2 stops21h 55m

$492

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 October is, on average, the cheapest month to fly to Porto from Seattle, with most prices found around $730. If you aren’t able to travel during the month of October, then book flights to Porto from Seattle during March instead. Flights to Porto in March, while not as cheap as those in October, still average around $777.

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 $1,041 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 $741 on momondo.

Can stopping save me money on Seattle to Porto flights?

You could potentially save up to 6% on your flight if you consider stops on a Seattle to Porto flight.

How have Seattle to Porto flight prices changed over time?

As of November 2025, prices for Seattle to Porto flights are approximately 86% more expensive when compared to flights at the same time last year.

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

Direct flights

None
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 12h 50m 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
LufthansaPriceFrom $642Free CancellationRating
6.8
7,579 reviews
Search Lufthansa flights
DeltaPriceFrom $647Free CancellationRating
7.9
8,002 reviews
Search Delta flights
KLMPriceFrom $659Free CancellationRating
7.7
1,414 reviews
Search KLM flights
United AirlinesPriceFrom $679Free CancellationRating
7.4
9,028 reviews
Search United Airlines flights
Turkish AirlinesPriceFrom $685Free CancellationRating
7.3
4,044 reviews
Search Turkish 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
Aveiro
Matosinhos
Braga
Lamego
Guimarães
Esposende
Chaves
Espinho
Viseu
Ponte de Lima
Arcos de Valdevez
Pinhao
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

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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 12/20
Sat 12/27
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Portugal