Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Seattle to Porto from $220

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 10/18. 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.
American Airlines Logo
7:00 am - 7:40 am
SEA
-
OPO
16h 40m
2 stops
American Airlines Logo
8:20 am - 8:45 pm
OPO
-
SEA
20h 25m
2 stops
$760American Airlines
Sun, Jan 17 - Fri, Jan 29
Multiple Airlines Logo
6:45 pm - 8:00 pm
SEA
-
OPO
17h 15m
2 stops
Multiple Airlines Logo
8:40 pm - 9:37 am
OPO
-
SEA
20h 57m
2 stops
$762Multiple Airlines
Mon, Nov 2 - Wed, Nov 11
Multiple Airlines Logo
6:45 pm - 8:00 pm
SEA
-
OPO
17h 15m
2 stops
Multiple Airlines Logo
8:40 pm - 9:37 am
OPO
-
SEA
20h 57m
2 stops
$767Multiple Airlines
Mon, Nov 2 - Wed, Nov 11
Multiple Airlines Logo
2:50 pm - 12:50 pm
SEA
-
OPO
14h 00m
1 stop
Multiple Airlines Logo
6:00 am - 9:57 pm
OPO
-
SEA
23h 57m
2 stops
$788Multiple Airlines
Wed, Nov 4 - Fri, Nov 27
Iberia Logo
5:10 am - 7:40 am
SEA
-
OPO
18h 30m
2 stops
Iberia Logo
8:40 pm - 7:12 pm
OPO
-
SEA
30h 32m
2 stops
$792Iberia
Sun, Nov 1 - Tue, Dec 1
Lufthansa Logo
2:50 pm - 12:50 pm
SEA
-
OPO
14h 00m
1 stop
Lufthansa Logo
6:15 am - 1:00 pm
OPO
-
SEA
14h 45m
1 stop
$794Lufthansa
Wed, Nov 4 - Fri, Nov 27
Multiple Airlines Logo
2:00 pm - 10:25 pm
SEA
-
OPO
24h 25m
1 stop
Multiple Airlines Logo
6:00 am - 9:57 pm
OPO
-
SEA
23h 57m
2 stops
$796Multiple Airlines
Mon, Nov 2 - Wed, Nov 11
British Airways Logo
6:45 pm - 5:50 pm
SEA
-
OPO
15h 05m
1 stop
British Airways Logo
8:40 pm - 8:15 pm
OPO
-
SEA
31h 35m
2 stops
$799British Airways
Wed, Nov 18 - Wed, Dec 2
British Airways Logo
1:30 pm - 5:45 pm
SEA
-
OPO
20h 15m
1 stop
British Airways Logo
6:40 pm - 4:50 pm
OPO
-
SEA
30h 10m
1 stop
$800British Airways
Tue, Nov 17 - Thu, Dec 3
Multiple Airlines Logo
2:00 pm - 10:25 pm
SEA
-
OPO
24h 25m
1 stop
Multiple Airlines Logo
6:00 am - 9:57 pm
OPO
-
SEA
23h 57m
2 stops
$801Multiple Airlines
Mon, Nov 2 - Wed, Nov 11

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

American Airlines flights from Seattle to Porto

Our best American Airlines deals on Seattle to Porto flight tickets
American Airlines
Jan 17
SEA7:00 amSeattle/Tacoma Intl
16h 40m
2 stops
OPO7:40 amPorto
Jan 29
OPO8:20 amPorto
20h 25m
2 stops
SEA8:45 pmSeattle/Tacoma Intl
$760
American Airlines
Jan 17
SEA6:00 amSeattle/Tacoma Intl
17h 40m
2 stops
OPO7:40 amPorto
Jan 30
OPO8:40 pmPorto
21h 05m
2 stops
SEA9:45 amSeattle/Tacoma Intl
$810
American Airlines
Oct 28
SEA10:31 amSeattle/Tacoma Intl
18h 14m
2 stops
OPO11:45 amPorto
Nov 8
OPO8:20 amPorto
20h 00m
2 stops
SEA8:20 pmSeattle/Tacoma Intl
$814

United Airlines flights from Seattle to Porto

Our best United Airlines deals on Seattle to Porto flight tickets
United Airlines
Nov 2
SEA5:00 amSeattle/Tacoma Intl
20h 30m
2 stops
OPO9:30 amPorto
Nov 11
OPO12:35 pmPorto
16h 46m
1 stop
SEA9:21 pmSeattle/Tacoma Intl
$820
United Airlines
Nov 2
SEA7:00 amSeattle/Tacoma Intl
18h 30m
1 stop
OPO9:30 amPorto
Nov 11
OPO12:35 pmPorto
16h 46m
1 stop
SEA9:21 pmSeattle/Tacoma Intl
$825
United Airlines
Sep 21
SEA11:59 pmSeattle/Tacoma Intl
22h 16m
2 stops
OPO6:15 amPorto
Oct 13
OPO12:15 pmPorto
31h 12m
2 stops
SEA11:27 amSeattle/Tacoma Intl
$843

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 July 23, 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 - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 1/17

7:00 am-7:40 am

2 stops16h 40m

Porto

Fri 1/29

8:20 am-8:45 pm

2 stops20h 25m

$760

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/2

6:45 pm-8:00 pm

2 stops17h 15m

Porto

Wed 11/11

8:40 pm-9:37 am

2 stops20h 57m

$762

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/2

6:45 pm-8:00 pm

2 stops17h 15m

Porto

Wed 11/11

8:40 pm-9:37 am

2 stops20h 57m

$767

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 11/4

2:50 pm-12:50 pm

1 stop14h 00m

Porto

Fri 11/27

6:00 am-9:57 pm

2 stops23h 57m

$788

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 11/1

5:10 am-7:40 am

2 stops18h 30m

Porto

Tue 12/1

8:40 pm-7:12 pm

2 stops30h 32m

$792
Quickest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 11/4

2:50 pm-12:50 pm

1 stop14h 00m

Porto

Fri 11/27

6:15 am-1:00 pm

1 stop14h 45m

$794

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/2

2:00 pm-10:25 pm

1 stop24h 25m

Porto

Wed 11/11

6:00 am-9:57 pm

2 stops23h 57m

$796

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 11/18

6:45 pm-5:50 pm

1 stop15h 05m

Porto

Wed 12/2

8:40 pm-8:15 pm

2 stops31h 35m

$799

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 11/17

1:30 pm-5:45 pm

1 stop20h 15m

Porto

Thu 12/3

6:40 pm-4:50 pm

1 stop30h 10m

$800

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 11/2

2:00 pm-10:25 pm

1 stop24h 25m

Porto

Wed 11/11

6:00 am-9:57 pm

2 stops23h 57m

$801

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 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 $882 to $1,286.
The lowest price recently found on this route was $760.

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 $912 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 33% 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

17h 10m

Direct flights

None
The fastest flight from Seattle to Porto takes 17h 10m
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 17h 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
7.8
1,544 reviews
Search KLM flights
LufthansaPriceFrom $503Free CancellationRating
6.8
8,158 reviews
Search Lufthansa flights
DeltaPriceFrom $588Free CancellationRating
7.8
8,483 reviews
Search Delta flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
10,025 reviews
Search United Airlines flights
Air CanadaPriceFrom $660Free CancellationRating
7.1
11,377 reviews
Search Air Canada flights
Turkish AirlinesPriceFrom $685Free CancellationRating
7.4
4,453 reviews
Search Turkish Airlines flights
Air FrancePriceFrom $905Free CancellationRating
7.4
1,628 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
Esposende
Lamego
Pinhao
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.
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 8/22
Sat 8/29
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Portugal