Which airport is the most popular layover for flights between Seattle and Porto?

Amsterdam (AMS) was the most common stop: 75% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest travel time from Seattle to Porto?

Flights connecting via New York (JFK) have the shortest average one-way travel time: 14h 58m.

Which layover airport has the shortest connection time from Seattle to Porto?

Amsterdam (AMS) has the shortest average layover time for this route: 2h 32m.

What airlines fly to Porto?

Delta, KLM and Lufthansa are the top three most popular airlines that fly to Porto from Seattle according to our data. Delta is the first choice among our users, with 47% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 6 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.

Which layover airport offers the lowest fares from Seattle to Porto?

Flights via New York (JFK) offer the lowest average round-trip price of $971.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Porto?

Lufthansa, British Airways, and Air Canada are the most popular carriers operating from Seattle/Tacoma Intl to Porto

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?

As of September 2026, there are 6 operators available to choose from 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.

$305 Cheap Flights from Seattle to Porto in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Porto

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:50 am - 7:00 amSEA Seattle/Tacoma Intl-OPO Porto

17h 10m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

8:40 am - 6:32 pmOPO Porto-SEA Seattle/Tacoma Intl

17h 52m2 stops Zurich Vancouver Intl

$586Multiple Airlines

Tue, Oct 13 - Thu, Oct 22

6:45 pm - 8:00 pmSEA Seattle/Tacoma Intl-OPO Porto

17h 15m2 stops London Heathrow Madrid Barajas

12:25 pm - 4:54 pmOPO Porto-SEA Seattle/Tacoma Intl

36h 29m2 stops Madrid Barajas Dallas/Fort Worth

$608Multiple Airlines

Mon, Jan 11 - Mon, Jan 25

2:50 pm - 12:50 pmSEA Seattle/Tacoma Intl-OPO Porto

14h 00m1 stop Munich Franz Josef Strauss

12:35 pm - 12:00 pmOPO Porto-SEA Seattle/Tacoma Intl

31h 25m1 stop Frankfurt am Main

$654Lufthansa

Wed, Jan 6 - Wed, Jan 20

6:50 pm - 11:25 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 35m1 stop Munich Franz Josef Strauss

6:20 am - 4:59 pmOPO Porto-SEA Seattle/Tacoma Intl

18h 39m1 stop Munich Franz Josef Strauss

$657Lufthansa

Tue, Oct 6 - Wed, Oct 14

7:05 pm - 3:20 pmSEA Seattle/Tacoma Intl-OPO Porto

36h 15m2 stops Vancouver Intl Frankfurt am Main

6:00 am - 9:27 amOPO Porto-SEA Seattle/Tacoma Intl

35h 27m2 stops Frankfurt am Main Vancouver Intl

$659Air Canada

Sat, Feb 13 - Wed, Feb 24

6:50 am - 9:30 amSEA Seattle/Tacoma Intl-OPO Porto

18h 40m1 stop Newark

12:35 pm - 9:05 pmOPO Porto-SEA Seattle/Tacoma Intl

16h 30m1 stop Newark

$660United Airlines

Thu, Mar 11 - Wed, Mar 31

5:30 pm - 3:20 pmSEA Seattle/Tacoma Intl-OPO Porto

37h 50m2 stops San Francisco Frankfurt am Main

12:35 pm - 9:05 pmOPO Porto-SEA Seattle/Tacoma Intl

16h 30m1 stop Newark

$662United Airlines

Sat, Feb 13 - Wed, Feb 24

7:20 am - 10:30 amSEA Seattle/Tacoma Intl-OPO Porto

19h 10m2 stops Chicago O'Hare Intl Amsterdam Schiphol

5:55 am - 4:53 pmOPO Porto-SEA Seattle/Tacoma Intl

18h 58m2 stops Paris Charles de Gaulle Salt Lake City

$705Delta

Thu, Mar 11 - Wed, Mar 31

3:25 pm - 10:30 pmSEA Seattle/Tacoma Intl-OPO Porto

24h 05m1 stop Amsterdam Schiphol

5:55 am - 3:14 pmOPO Porto-SEA Seattle/Tacoma Intl

17h 19m1 stop Paris Charles de Gaulle

$735Delta

Sat, Oct 31 - Sun, Nov 22

7:45 am - 12:50 pmSEA Seattle/Tacoma Intl-OPO Porto

21h 05m2 stops Toronto Pearson Intl Munich Franz Josef Strauss

6:00 am - 6:22 pmOPO Porto-SEA Seattle/Tacoma Intl

20h 22m2 stops Frankfurt am Main Vancouver Intl

$753Air Canada

Wed, Jan 6 - Fri, Feb 5

Cheap last minute flights

Enter your travel dates to find the best prices.

11:04 pm - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

26h 41m2 stops Washington, D.C. Dulles Intl Newark

6:20 am - 4:59 pmOPO Porto-SEA Seattle/Tacoma Intl

18h 39m1 stop Munich Franz Josef Strauss

$713Multiple Airlines

Thu, Sep 17 - Fri, Oct 2

3:34 pm - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

34h 11m1 stop Newark

6:20 am - 4:59 pmOPO Porto-SEA Seattle/Tacoma Intl

18h 39m1 stop Munich Franz Josef Strauss

$718Multiple Airlines

Thu, Sep 17 - Fri, Oct 2

11:59 pm - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

25h 46m2 stops Houston George Bush Intcntl Newark

6:00 am - 8:37 pmOPO Porto-SEA Seattle/Tacoma Intl

22h 37m2 stops Frankfurt am Main Washington, D.C. Dulles Intl

$725United Airlines

Thu, Sep 17 - Fri, Oct 2

11:04 pm - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

26h 41m2 stops Washington, D.C. Dulles Intl Newark

6:20 am - 4:59 pmOPO Porto-SEA Seattle/Tacoma Intl

18h 39m1 stop Munich Franz Josef Strauss

$867Multiple Airlines

Thu, Sep 17 - Sun, Oct 4

11:04 pm - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

26h 41m2 stops Washington, D.C. Dulles Intl Newark

7:20 pm - 6:32 pmOPO Porto-SEA Seattle/Tacoma Intl

31h 12m2 stops Zurich Vancouver Intl

$867Multiple Airlines

Thu, Sep 17 - Sun, Oct 4

10:58 pm - 6:55 amSEA Seattle/Tacoma Intl-OPO Porto

23h 57m1 stop Newark

12:15 pm - 4:07 pmOPO Porto-SEA Seattle/Tacoma Intl

35h 52m2 stops Montreal Pierre Elliott Trudeau Intl Chicago O'Hare Intl

$990United Airlines

Wed, Sep 16 - Tue, Sep 22

11:00 pm - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

26h 45m2 stops Chicago O'Hare Intl Newark

12:15 pm - 4:07 pmOPO Porto-SEA Seattle/Tacoma Intl

35h 52m2 stops Montreal Pierre Elliott Trudeau Intl Chicago O'Hare Intl

$995United Airlines

Wed, Sep 16 - Tue, Sep 22

6:50 pm - 11:25 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 35m1 stop Munich Franz Josef Strauss

6:20 am - 4:59 pmOPO Porto-SEA Seattle/Tacoma Intl

18h 39m1 stop Munich Franz Josef Strauss

$1,016Lufthansa

Wed, Sep 16 - Tue, Sep 22

6:50 pm - 11:25 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 35m1 stop Munich Franz Josef Strauss

6:20 am - 4:59 pmOPO Porto-SEA Seattle/Tacoma Intl

18h 39m1 stop Munich Franz Josef Strauss

$1,043Lufthansa

Wed, Sep 16 - Tue, Sep 22

5:45 pm - 3:30 pmSEA Seattle/Tacoma Intl-OPO Porto

13h 45m1 stop Amsterdam Schiphol

5:00 am - 11:52 amOPO Porto-SEA Seattle/Tacoma Intl

14h 52m1 stop Amsterdam Schiphol

$1,057KLM

Thu, Sep 17 - Sun, Oct 4

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

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

Trusted and free

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

Price Alerts

Not ready to book? to track prices.

Search flight deals

Lufthansa flights from Seattle to Porto

Our best Lufthansa deals on Seattle to Porto flight tickets

Lufthansa

Oct 6

SEA6:50 pmSeattle/Tacoma Intl

20h 35m

1 stop

OPO11:25 pmPorto

Oct 14

OPO6:20 amPorto

18h 39m

1 stop

SEA4:59 pmSeattle/Tacoma Intl

$657

Lufthansa

Sep 30

SEA6:50 pmSeattle/Tacoma Intl

20h 35m

1 stop

OPO11:25 pmPorto

Oct 7

OPO6:20 amPorto

18h 39m

1 stop

SEA4:59 pmSeattle/Tacoma Intl

$658

Lufthansa

Jan 11

SEA1:50 pmSeattle/Tacoma Intl

17h 30m

1 stop

OPO3:20 pmPorto

Jan 25

OPO1:45 pmPorto

36h 37m

2 stops

SEA6:22 pmSeattle/Tacoma Intl

$680

Iberia flights from Seattle to Porto

Our best Iberia deals on Seattle to Porto flight tickets

Iberia

Oct 26

SEA6:12 amSeattle/Tacoma Intl

26h 48m

2 stops

OPO4:00 pmPorto

Nov 2

OPO9:55 pmPorto

26h 55m

2 stops

SEA4:50 pmSeattle/Tacoma Intl

$621

Iberia

Nov 1

SEA5:10 amSeattle/Tacoma Intl

18h 30m

2 stops

OPO7:40 amPorto

Nov 22

OPO8:45 amPorto

58h 40m

2 stops

SEA11:25 amSeattle/Tacoma Intl

$629

Iberia

Oct 5

SEA6:12 amSeattle/Tacoma Intl

21h 33m

2 stops

OPO11:45 amPorto

Oct 22

OPO8:40 pmPorto

31h 35m

2 stops

SEA8:15 pmSeattle/Tacoma Intl

$660

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 10/13

5:50 am-7:00 am

2 stops17h 10m

Porto

Thu 10/22

8:40 am-6:32 pm

2 stops17h 52m

$586

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 1/11

6:45 pm-8:00 pm

2 stops17h 15m

Porto

Mon 1/25

12:25 pm-4:54 pm

2 stops36h 29m

$608

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 1/6

2:50 pm-12:50 pm

1 stop14h 00m

Porto

Wed 1/20

12:35 pm-12:00 pm

1 stop31h 25m

$654

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 10/6

6:50 pm-11:25 pm

1 stop20h 35m

Porto

Wed 10/14

6:20 am-4:59 pm

1 stop18h 39m

$657

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sat 2/13

7:05 pm-3:20 pm

2 stops36h 15m

Porto

Wed 2/24

6:00 am-9:27 am

2 stops35h 27m

$659

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Thu 3/11

6:50 am-9:30 am

1 stop18h 40m

Porto

Wed 3/31

12:35 pm-9:05 pm

1 stop16h 30m

$660

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sat 2/13

5:30 pm-3:20 pm

2 stops37h 50m

Porto

Wed 2/24

12:35 pm-9:05 pm

1 stop16h 30m

$662

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Thu 3/11

7:20 am-10:30 am

2 stops19h 10m

Porto

Wed 3/31

5:55 am-4:53 pm

2 stops18h 58m

$705

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sat 10/31

3:25 pm-10:30 pm

1 stop24h 05m

Porto

Sun 11/22

5:55 am-3:14 pm

1 stop17h 19m

$735

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 1/6

7:45 am-12:50 pm

2 stops21h 05m

Porto

Fri 2/5

6:00 am-6:22 pm

2 stops20h 22m

$753

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Layovers

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 $906 to $1,127.
The lowest price recently found on this route was $586.

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 $896 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 23% 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

Best Price Found	$305
Fastest flight time	16h 00m
Direct flights	None

The best one-way flight to Porto from Seattle in the past 72 hours is $305. The best round-trip flight deal from Seattle to Porto found on momondo in the last 72 hours is $586.

The fastest flight from Seattle to Porto takes 16h 00m

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 16h 00m 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?
As of September 2026, there are 6 operators available to choose from 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?
Based on momondo bookings for flights between Seattle and Porto, the leading airline is Delta, making up 42% of the total bookings. Other popular airlines include KLM with 23%, Lufthansa with 15%, and United Airlines with 10%.

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
KLM	PriceFrom $490	Free Cancellation	Rating 7.8 1,576 reviews	Search KLM flights
Lufthansa	PriceFrom $503	Free Cancellation	Rating 6.8 8,220 reviews	Search Lufthansa flights
Delta	PriceFrom $630	Free Cancellation	Rating 7.8 8,567 reviews	Search Delta flights
Air Canada	PriceFrom $660	Free Cancellation	Rating 7.1 11,619 reviews	Search Air Canada flights
United Airlines	PriceFrom $691	Free Cancellation	Rating 7.4 10,207 reviews	Search United Airlines flights
Air France	PriceFrom $905	Free Cancellation	Rating 7.5 1,650 reviews	Search Air France flights

Coimbra

Vila Nova de Gaia

Aveiro

Braga

Pinhao

Matosinhos

Esposende

Chaves

Arcos de Valdevez

Viseu

Espinho

Guimarães

Lamego

Ponte de Lima

Penafiel

Caminha

Baiao

Mira

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

Mon 10/12

Mon 10/19

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Portugal

Nearby airports

Airlines

Cabin classes

Other Portugal destinations

Other flights from Seattle

Complete your trip

Feeling lucky

Airports servicing Portugal

Faro Airport

Lisbon Humberto Delgado Airport

Azores Airport

Madeira Airport

Algarve Airport

Cheap flights from Seattle to Porto from $305

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 10/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Seattle to Porto

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Lufthansa flights from Seattle to Porto

Our best Lufthansa deals on Seattle to Porto flight tickets

Iberia flights from Seattle to Porto

Our best Iberia deals on Seattle to Porto flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to Porto that are best for you.

See travel insights to Porto from

How to get the cheapest flight ticket from Seattle to Porto

What is the typical price of a round-trip flight between Seattle and Porto?

What is the cheapest month to fly to Porto?

How far in advance should I book a flight from Seattle to Porto?

Can stopping save me money on Seattle to Porto flights?

How have Seattle to Porto flight prices changed over time?

What is the cheapest airline that flies from Seattle/Tacoma Intl to Porto?

What airlines fly to Porto?

Which airport is the most popular layover for flights between Seattle and Porto?

Which layover airport offers the lowest fares from Seattle to Porto?

Which layover airport has the shortest travel time from Seattle to Porto?

Which layover airport has the shortest connection time from Seattle to Porto?

When to book flights from Seattle to Porto

Cheap Seattle to Porto (SEA to OPO) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying 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

Traveling to a place near Porto?

Why use momondo?

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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Portugal

Airports servicing Portugal

Fly your favorite airline to Porto

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Porto

List of cabin classes available on flights landing in Porto. Availability may vary depending on flight origin and airline.

Popular cities in Portugal

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Seattle

According to popular flight searches on momondo this year

Complete your trip to Porto

Explore popular destinations other users love

According to popular flight searches on momondo this year