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.

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 has the shortest connection time from Seattle to Porto?

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

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?

Delta, United Airlines, and Lufthansa 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

11:59 pm - 9:30 amSEA Seattle/Tacoma Intl-OPO Porto

25h 31m2 stops Houston George Bush Intcntl Newark

12:35 pm - 11:16 amOPO Porto-SEA Seattle/Tacoma Intl

30h 41m1 stop Newark

$595United Airlines

Sun, Nov 8 - Tue, Nov 24

6:15 am - 9:30 amSEA Seattle/Tacoma Intl-OPO Porto

19h 15m1 stop Newark

12:35 pm - 11:16 amOPO Porto-SEA Seattle/Tacoma Intl

30h 41m1 stop Newark

$595United Airlines

Sun, Nov 8 - Tue, Nov 24

10:43 am - 4:45 pmSEA Seattle/Tacoma Intl-OPO Porto

22h 02m2 stops Chicago O'Hare Intl London Heathrow

8:20 am - 8:21 pmOPO Porto-SEA Seattle/Tacoma Intl

20h 01m2 stops Madrid Barajas Chicago O'Hare Intl

$600British Airways

Sun, Nov 8 - Tue, Nov 24

7:15 am - 8:15 amSEA Seattle/Tacoma Intl-OPO Porto

17h 00m1 stop New York John F Kennedy Intl

10:15 am - 8:19 pmOPO Porto-SEA Seattle/Tacoma Intl

18h 04m1 stop New York John F Kennedy Intl

$605Air France

Wed, Nov 11 - Thu, Dec 3

10:59 pm - 10:30 amSEA Seattle/Tacoma Intl-OPO Porto

27h 31m1 stop New York John F Kennedy Intl

10:15 am - 8:09 pmOPO Porto-SEA Seattle/Tacoma Intl

17h 54m1 stop New York John F Kennedy Intl

$613Delta

Mon, Oct 12 - Thu, Nov 5

6:40 pm - 10:05 pmSEA Seattle/Tacoma Intl-OPO Porto

19h 25m1 stop Paris Charles de Gaulle

10:15 am - 11:04 pmOPO Porto-SEA Seattle/Tacoma Intl

20h 49m1 stop New York John F Kennedy Intl

$619Delta

Tue, Oct 13 - Thu, Nov 5

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

14h 00m1 stop Munich Franz Josef Strauss

6:15 am - 2:00 pmOPO Porto-SEA Seattle/Tacoma Intl

14h 45m1 stop Munich Franz Josef Strauss

$624Lufthansa

Sun, Feb 7 - Fri, Mar 19

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

20h 35m1 stop Munich Franz Josef Strauss

6:15 am - 1:00 pmOPO Porto-SEA Seattle/Tacoma Intl

14h 45m1 stop Munich Franz Josef Strauss

$627Lufthansa

Tue, Oct 13 - Fri, Nov 6

7:15 am - 10:30 amSEA Seattle/Tacoma Intl-OPO Porto

19h 15m1 stop New York John F Kennedy Intl

5:55 am - 6:35 pmOPO Porto-SEA Seattle/Tacoma Intl

20h 40m2 stops Paris Charles de Gaulle Detroit Metropolitan Wayne County

$639Air France

Mon, Oct 12 - Wed, Nov 4

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

3:55 pm - 11:55 pmSEA Seattle/Tacoma Intl-OPO Porto

24h 00m2 stops Kastrup Copenhagen Paris Orly

8:55 pm - 1:45 pmOPO Porto-SEA Seattle/Tacoma Intl

24h 50m1 stop Kastrup Copenhagen

$721Multiple Airlines

Sun, Sep 20 - Mon, Oct 5

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

11:22 am - 3:30 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 08m2 stops Salt Lake City Paris Charles de Gaulle

5:00 am - 4:35 pmOPO Porto-SEA Seattle/Tacoma Intl

19h 35m1 stop Amsterdam Schiphol

$762Delta

Sun, Sep 20 - Tue, Sep 29

6:45 pm - 10:00 pmSEA Seattle/Tacoma Intl-OPO Porto

19h 15m1 stop Paris Charles de Gaulle

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

14h 52m1 stop Amsterdam Schiphol

$818Delta

Sun, Sep 20 - Mon, Oct 5

2:10 pm - 3:40 pmSEA Seattle/Tacoma Intl-OPO Porto

17h 30m1 stop Frankfurt am Main

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

18h 39m1 stop Munich Franz Josef Strauss

$905Lufthansa

Sun, Sep 20 - Tue, Sep 29

2:10 pm - 3:40 pmSEA Seattle/Tacoma Intl-OPO Porto

17h 30m1 stop Frankfurt am Main

6:00 am - 4:59 pmOPO Porto-SEA Seattle/Tacoma Intl

18h 59m2 stops Frankfurt am Main Munich Franz Josef Strauss

$910Lufthansa

Sun, Sep 20 - Tue, Sep 29

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

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Iberia flights from Seattle to Porto

Our best Iberia deals on Seattle to Porto flight tickets

Iberia

Oct 13

SEA6:12 amSeattle/Tacoma Intl

21h 33m

2 stops

OPO11:45 amPorto

Nov 5

OPO8:40 pmPorto

31h 40m

2 stops

SEA8:20 pmSeattle/Tacoma Intl

$621

Iberia

Oct 24

SEA2:26 pmSeattle/Tacoma Intl

18h 34m

2 stops

OPO5:00 pmPorto

Nov 2

OPO9:55 pmPorto

26h 55m

2 stops

SEA4:50 pmSeattle/Tacoma Intl

$671

Iberia

Sep 22

SEA6:18 amSeattle/Tacoma Intl

29h 42m

2 stops

OPO8:00 pmPorto

Sep 29

OPO3:00 pmPorto

28h 35m

2 stops

SEA11:35 amSeattle/Tacoma Intl

$740

Delta flights from Seattle to Porto

Our best Delta deals on Seattle to Porto flight tickets

Delta

Oct 12

SEA10:59 pmSeattle/Tacoma Intl

27h 31m

1 stop

OPO10:30 amPorto

Nov 5

OPO10:15 amPorto

17h 54m

1 stop

SEA8:09 pmSeattle/Tacoma Intl

$613

Delta

Oct 13

SEA6:40 pmSeattle/Tacoma Intl

19h 25m

1 stop

OPO10:05 pmPorto

Nov 5

OPO10:15 amPorto

20h 49m

1 stop

SEA11:04 pmSeattle/Tacoma Intl

$619

Delta

Oct 14

SEA6:40 pmSeattle/Tacoma Intl

19h 20m

1 stop

OPO10:00 pmPorto

Nov 6

OPO5:55 amPorto

17h 19m

1 stop

SEA3:14 pmSeattle/Tacoma Intl

$624

Fly from

Fly to

Route

Depart

Return

Price

Cheapest 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

Sun 11/8

11:59 pm-9:30 am

2 stops25h 31m

Porto

Tue 11/24

12:35 pm-11:16 am

1 stop30h 41m

$595

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 11/8

6:15 am-9:30 am

1 stop19h 15m

Porto

Tue 11/24

12:35 pm-11:16 am

1 stop30h 41m

$595

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 11/8

10:43 am-4:45 pm

2 stops22h 02m

Porto

Tue 11/24

8:20 am-8:21 pm

2 stops20h 01m

$600

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 11/11

7:15 am-8:15 am

1 stop17h 00m

Porto

Thu 12/3

10:15 am-8:19 pm

1 stop18h 04m

$605

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 10/12

10:59 pm-10:30 am

1 stop27h 31m

Porto

Thu 11/5

10:15 am-8:09 pm

1 stop17h 54m

$613

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 10/13

6:40 pm-10:05 pm

1 stop19h 25m

Porto

Thu 11/5

10:15 am-11:04 pm

1 stop20h 49m

$619

Quickest round-trip

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 2/7

2:50 pm-12:50 pm

1 stop14h 00m

Porto

Fri 3/19

6:15 am-2:00 pm

1 stop14h 45m

$624

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 10/13

6:50 pm-11:25 pm

1 stop20h 35m

Porto

Fri 11/6

6:15 am-1:00 pm

1 stop14h 45m

$627

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 10/12

7:15 am-10:30 am

1 stop19h 15m

Porto

Wed 11/4

5:55 am-6:35 pm

2 stops20h 40m

$639

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	17h 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 17h 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 17h 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 22%, 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 1,580 reviews	Search KLM flights
Lufthansa	PriceFrom $503	Free Cancellation	Rating 6.8 8,219 reviews	Search Lufthansa flights
Delta	PriceFrom $630	Free Cancellation	Rating 7.8 8,568 reviews	Search Delta flights
Air Canada	PriceFrom $660	Free Cancellation	Rating 7.1 11,630 reviews	Search Air Canada flights
United Airlines	PriceFrom $691	Free Cancellation	Rating 7.4 10,211 reviews	Search United Airlines flights
Air France	PriceFrom $795	Free Cancellation	Rating 7.5 1,651 reviews	Search Air France flights

Coimbra

Vila Nova de Gaia

Aveiro

Braga

Pinhao

Matosinhos

Esposende

Chaves

Viseu

Arcos de Valdevez

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

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Airports servicing Portugal

Faro Airport

Lisbon Humberto Delgado Airport

Azores Airport

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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.

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Cheap round-trip flights

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Filter for what you want

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Iberia flights from Seattle to Porto

Our best Iberia deals on Seattle to Porto flight tickets

Delta flights from Seattle to Porto

Our best Delta deals on Seattle to Porto flight tickets

momondo Fare Finder

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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

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