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

TAP AIR PORTUGAL, Turkish Airlines, and Lufthansa 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 July 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.

$404 Cheap Flights from Porto to Seattle in 2025

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Find the cheapest flights from Porto to Seattle

Round-trip

One-way

Cheap round-trip flights

1:35 pm - 1:50 pmOPO-SEA

32h 15m2 stops

4:00 pm - 6:30 pmSEA-OPO

18h 30m2 stops

$783

Find Deal

Thu, Aug 28 - Fri, Sep 5

6:30 am - 3:55 pmOPO-SEA

17h 25m1 stop

6:45 pm - 8:35 pmSEA-OPO

17h 50m1 stop

$788KLM

Find Deal

Thu, Aug 28 - Fri, Sep 5

1:35 pm - 1:50 pmOPO-SEA

32h 15m2 stops

4:00 pm - 8:25 amSEA-OPO

32h 25m3 stops

$829

Find Deal

Thu, Aug 28 - Fri, Sep 5

6:30 am - 8:24 pmOPO-SEA

21h 54m2 stops

6:45 pm - 8:35 pmSEA-OPO

17h 50m1 stop

$847

Find Deal

Thu, Aug 28 - Fri, Sep 5

6:00 am - 11:55 amOPO-SEA

13h 55m1 stop

10:55 pm - 6:55 amSEA-OPO

24h 00m2 stops

$848United Airlines

Find Deal

Thu, Aug 28 - Fri, Sep 5

10:00 am - 8:42 pmOPO-SEA

18h 42m2 stops

7:00 am - 6:50 amSEA-OPO

15h 50m2 stops

$1,188United Airlines

Find Deal

Thu, Aug 28 - Fri, Sep 5

6:00 am - 11:55 amOPO-SEA

13h 55m1 stop

7:37 pm - 9:35 amSEA-OPO

29h 58m2 stops

$1,196United Airlines

Find Deal

Sun, Sep 28 - Sun, Sep 28

6:00 am - 11:55 amOPO-SEA

13h 55m1 stop

6:50 pm - 11:20 pmSEA-OPO

20h 30m1 stop

$1,587Lufthansa

Find Deal

Sun, Sep 28 - Sun, Sep 28

5:00 am - 2:00 pmOPO-SEA

17h 00m2 stops

4:20 pm - 10:15 pmSEA-OPO

21h 55m2 stops

$2,228Scandinavian Airlines

Find Deal

Sun, Sep 28 - Sun, Sep 28

6:00 am - 6:36 pmOPO-SEA

20h 36m2 stops

2:20 pm - 10:45 pmSEA-OPO

24h 25m1 stop

$3,853Lufthansa

Find Deal

Tue, Sep 30 - Sat, Oct 11

United Airlines flights from Porto to Seattle

Our best United Airlines deals on Porto to Seattle flight tickets

United Airlines

Aug 28

OPO6:00 amPorto

13h 55m

1 stop

SEA11:55 amSeattle/Tacoma Intl

Sep 5

SEA10:55 pmSeattle/Tacoma Intl

24h 00m

2 stops

OPO6:55 amPorto

$848

Find similar

United Airlines

Aug 28

OPO10:00 amPorto

18h 42m

2 stops

SEA8:42 pmSeattle/Tacoma Intl

Sep 5

SEA7:00 amSeattle/Tacoma Intl

15h 50m

2 stops

OPO6:50 amPorto

$1,188

Find similar

United Airlines

Sep 28

OPO6:00 amPorto

13h 55m

1 stop

SEA11:55 amSeattle/Tacoma Intl

Sep 28

SEA7:37 pmSeattle/Tacoma Intl

29h 58m

2 stops

OPO9:35 amPorto

$1,196

Find similar

Turkish Airlines flights from Porto to Seattle

Our best Turkish Airlines deals on Porto to Seattle flight tickets

Turkish Airlines

Sep 24

OPO10:50 amPorto

31h 45m

1 stop

SEA10:35 amSeattle/Tacoma Intl

Oct 5

SEA7:10 pmSeattle/Tacoma Intl

30h 40m

1 stop

OPO9:50 amPorto

$3,232

Find similar

Turkish Airlines

Oct 13

OPO10:55 amPorto

31h 40m

1 stop

SEA10:35 amSeattle/Tacoma Intl

Oct 14

SEA7:10 pmSeattle/Tacoma Intl

36h 40m

1 stop

OPO3:50 pmPorto

$3,257

Find similar

Turkish Airlines

Sep 30

OPO10:50 amPorto

38h 25m

1 stop

SEA5:15 pmSeattle/Tacoma Intl

Oct 11

SEA7:10 pmSeattle/Tacoma Intl

36h 40m

1 stop

OPO3:50 pmPorto

$3,486

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 8/28

1:35 pm-1:50 pm

2 stops32h 15m

Seattle/Tacoma Intl

Fri 9/5

4:00 pm-6:30 pm

2 stops18h 30m

$783

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 8/28

6:30 am-3:55 pm

1 stop17h 25m

Seattle/Tacoma Intl

Fri 9/5

6:45 pm-8:35 pm

1 stop17h 50m

$788

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 8/28

1:35 pm-1:50 pm

2 stops32h 15m

Seattle/Tacoma Intl

Fri 9/5

4:00 pm-8:25 am

3 stops32h 25m

$829

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 8/28

6:30 am-8:24 pm

2 stops21h 54m

Seattle/Tacoma Intl

Fri 9/5

6:45 pm-8:35 pm

1 stop17h 50m

$847

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 8/28

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Fri 9/5

10:55 pm-6:55 am

2 stops24h 00m

$848

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 8/28

10:00 am-8:42 pm

2 stops18h 42m

Seattle/Tacoma Intl

Fri 9/5

7:00 am-6:50 am

2 stops15h 50m

$1,188

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 9/28

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Sun 9/28

7:37 pm-9:35 am

2 stops29h 58m

$1,196

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 9/28

6:00 am-11:55 am

1 stop13h 55m

Seattle/Tacoma Intl

Sun 9/28

6:50 pm-11:20 pm

1 stop20h 30m

$1,587

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 9/28

5:00 am-2:00 pm

2 stops17h 00m

Seattle/Tacoma Intl

Sun 9/28

4:20 pm-10:15 pm

2 stops21h 55m

$2,228

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 9/30

6:00 am-6:36 pm

2 stops20h 36m

Seattle/Tacoma Intl

Sat 10/11

2:20 pm-10:45 pm

1 stop24h 25m

$3,853

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 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 8% 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

Best Price Found	$404
Fastest flight time	13h 55m
Direct flights	None
Airports in Seattle	1 airport

The best one-way flight to Seattle from Porto in the past 72 hours is $404. The best round-trip flight deal from Porto to Seattle found on momondo in the last 72 hours is $783.

The fastest flight from Porto to Seattle takes 13h 55m

There are no direct flights from Porto to Seattle. Popular non-direct route for this connection is Porto Airport - Seattle/Tacoma Intl Airport.

There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)

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 July 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 1,383 reviews		Search KLM flights

Leavenworth

Tacoma

SeaTac

Ocean Shores

Olympia

Renton

Kent

Federal Way

Puyallup

Lynnwood

Marysville

Tukwila

Kirkland

Lakewood

Fife

Centralia

Cle Elum

Shoreline

Westport

Redmond

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.