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

Turkish Airlines, Iberia, and British Airways are the most popular carriers operating from Porto to Seattle/Tacoma Intl

When did momondo last update prices for flights from Porto Airport to Seattle/Tacoma Intl Airport?

Prices for flights from Porto Airport to Seattle/Tacoma Intl Airport are updated daily.

How many operators does momondo search for flights from Porto Airport to Seattle/Tacoma Intl Airport?

The number of operators available for flights from Porto Airport to Seattle/Tacoma Intl Airport is 1 as of September 2025.

How old do you have to be to fly from Porto Airport to Seattle/Tacoma Intl Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Porto Airport to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$437 Cheap Flights from Porto to Seattle in 2025/26

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

Prices are currently low for flights on this route. Typical prices usually range from $778 to $857. The lowest price recently found on this route was $775.

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Find the cheapest flights from Porto to Seattle

Round-trip

One-way

Cheap round-trip flights

6:40 am - 4:05 pmOPO-SEA

17h 25m1 stop

1:30 pm - 3:30 pmSEA-OPO

18h 00m1 stop

$775Delta

Find Deal

Fri, Sep 26 - Tue, Sep 30

6:30 am - 4:05 pmOPO-SEA

17h 35m1 stop

1:30 pm - 3:30 pmSEA-OPO

18h 00m1 stop

$776Delta

Find Deal

Thu, Oct 2 - Tue, Oct 7

8:40 pm - 11:18 pmOPO-SEA

34h 38m2 stops

7:19 am - 11:45 amSEA-OPO

20h 26m2 stops

$780Iberia

Find Deal

Tue, Nov 18 - Mon, Dec 1

11:15 am - 12:45 pmOPO-SEA

32h 30m1 stop

9:29 am - 10:30 amSEA-OPO

17h 01m2 stops

$784KLM

Find Deal

Wed, Oct 29 - Wed, Nov 5

4:20 pm - 5:40 pmOPO-SEA

33h 20m1 stop

1:30 pm - 3:30 pmSEA-OPO

18h 00m1 stop

$792KLM

Find Deal

Mon, Oct 13 - Mon, Oct 20

10:00 pm - 8:40 pmOPO-SEA

30h 40m3 stops

3:45 pm - 8:00 amSEA-OPO

32h 15m3 stops

$811Multiple Airlines

Find Deal

Thu, Oct 2 - Tue, Oct 7

10:00 pm - 8:40 pmOPO-SEA

30h 40m3 stops

7:00 pm - 6:50 pmSEA-OPO

15h 50m2 stops

$812Multiple Airlines

Find Deal

Thu, Oct 2 - Tue, Oct 7

6:00 am - 11:55 amOPO-SEA

13h 55m1 stop

7:00 am - 10:20 amSEA-OPO

19h 20m2 stops

$832Lufthansa

Find Deal

Mon, Oct 13 - Mon, Oct 20

6:00 am - 11:55 amOPO-SEA

13h 55m1 stop

2:20 pm - 3:45 pmSEA-OPO

17h 25m1 stop

$835Lufthansa

Find Deal

Mon, Oct 13 - Mon, Oct 20

9:55 pm - 4:55 pmOPO-SEA

27h 00m2 stops

12:59 am - 11:45 amSEA-OPO

26h 46m2 stops

$983Iberia

Find Deal

Tue, Nov 18 - Sun, Nov 30

KLM flights from Porto to Seattle

Our best KLM deals on Porto to Seattle flight tickets

KLM

Oct 29

OPO11:15 amPorto

32h 30m

1 stop

SEA12:45 pmSeattle/Tacoma Intl

Nov 5

SEA9:29 amSeattle/Tacoma Intl

17h 01m

2 stops

OPO10:30 amPorto

$784

Find similar

KLM

Oct 13

OPO4:20 pmPorto

33h 20m

1 stop

SEA5:40 pmSeattle/Tacoma Intl

Oct 20

SEA1:30 pmSeattle/Tacoma Intl

18h 00m

1 stop

OPO3:30 pmPorto

$792

Find similar

KLM

Sep 26

OPO4:20 pmPorto

33h 20m

1 stop

SEA5:40 pmSeattle/Tacoma Intl

Sep 30

SEA1:30 pmSeattle/Tacoma Intl

18h 00m

1 stop

OPO3:30 pmPorto

$851

Find similar

Delta flights from Porto to Seattle

Our best Delta deals on Porto to Seattle flight tickets

Delta

Sep 26

OPO6:40 amPorto

17h 25m

1 stop

SEA4:05 pmSeattle/Tacoma Intl

Sep 30

SEA1:30 pmSeattle/Tacoma Intl

18h 00m

1 stop

OPO3:30 pmPorto

$775

Find similar

Delta

Oct 2

OPO6:30 amPorto

17h 35m

1 stop

SEA4:05 pmSeattle/Tacoma Intl

Oct 7

SEA1:30 pmSeattle/Tacoma Intl

18h 00m

1 stop

OPO3:30 pmPorto

$776

Find similar

Delta

Sep 26

OPO6:40 amPorto

23h 21m

2 stops

SEA10:01 pmSeattle/Tacoma Intl

Sep 30

SEA1:30 pmSeattle/Tacoma Intl

18h 00m

1 stop

OPO3:30 pmPorto

$781

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 9/26

6:40 am-4:05 pm

1 stop17h 25m

Seattle/Tacoma Intl

Tue 9/30

1:30 pm-3:30 pm

1 stop18h 00m

$775

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/2

6:30 am-4:05 pm

1 stop17h 35m

Seattle/Tacoma Intl

Tue 10/7

1:30 pm-3:30 pm

1 stop18h 00m

$776

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 11/18

8:40 pm-11:18 pm

2 stops34h 38m

Seattle/Tacoma Intl

Mon 12/1

7:19 am-11:45 am

2 stops20h 26m

$780

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 10/29

11:15 am-12:45 pm

1 stop32h 30m

Seattle/Tacoma Intl

Wed 11/5

9:29 am-10:30 am

2 stops17h 01m

$784

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 10/13

4:20 pm-5:40 pm

1 stop33h 20m

Seattle/Tacoma Intl

Mon 10/20

1:30 pm-3:30 pm

1 stop18h 00m

$792

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/2

10:00 pm-8:40 pm

3 stops30h 40m

Seattle/Tacoma Intl

Tue 10/7

3:45 pm-8:00 am

3 stops32h 15m

$811

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/2

10:00 pm-8:40 pm

3 stops30h 40m

Seattle/Tacoma Intl

Tue 10/7

7:00 pm-6:50 pm

2 stops15h 50m

$812

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 10/13

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Mon 10/20

7:00 am-10:20 am

2 stops19h 20m

$832

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 10/13

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Mon 10/20

2:20 pm-3:45 pm

1 stop17h 25m

$835

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 11/18

9:55 pm-4:55 pm

2 stops27h 00m

Seattle/Tacoma Intl

Sun 11/30

12:59 am-11:45 am

2 stops26h 46m

$983

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 Porto to Seattle

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

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

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

On average, the least expensive day to fly to Seattle from Porto is on a Monday. momondo users have found tickets for Monday departures for as low as $792. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Porto because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,114.

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

Flying to Seattle from Porto in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $792 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $934. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Can stopping save me money on Porto to Seattle flights?

You could potentially save up to 2% on your flight if you consider stops on a Porto to Seattle flight.

When to book flights from Porto to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Porto to Seattle according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

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

Find info about flight duration, direct flights, and airports for your flight from Porto to Seattle

Direct flights	None

There are no direct flights from Porto to Seattle. There are no popular flight routes from Porto to Seattle.

Search flight deals

How far is Porto to Seattle/Tacoma Intl by plane?
Seattle/Tacoma Intl is 5083.1 mi away from Porto. 13h 55m is a normal flight duration for this route.
When did momondo last update prices for flights from Porto Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Porto Airport to Seattle/Tacoma Intl Airport are updated daily.
How many operators does momondo search for flights from Porto Airport to Seattle/Tacoma Intl Airport?
The number of operators available for flights from Porto Airport to Seattle/Tacoma Intl Airport is 1 as of September 2025.
How old do you have to be to fly from Porto Airport to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Porto Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Porto to Seattle?
Based on momondo bookings for flights between Porto and Seattle, the leading airline is KLM, making up 100% of the total bookings.

Best airlines flying from Porto to Seattle

Compare and see reviews for airlines that fly from Porto to Seattle with momondo

Airline	Rating	Free Cancellation	Price
KLM	PriceFrom $794	Free Cancellation	Rating 7.8 1,386 reviews		Search KLM flights

Leavenworth

Tacoma

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Federal Way

Kirkland

Tukwila

Shoreline

Lakewood

Centralia

Fife

Cle Elum

Redmond

Westport

Why use momondo?

Why should I use momondo to find a flight deal from Porto to Seattle?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Porto to Seattle for you.

Can I find flights from Porto to Seattle with flexible booking policies on momondo?

Yes. All flights to Seattle from Porto on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Porto to Seattle?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Seattle from Porto.

I’m not ready to book a flight from Porto to Seattle right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Seattle from Porto. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.