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

Turkish Airlines is the most popular carrier 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 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.

$444 Cheap Flights from Porto to Seattle in 2026

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Find the cheapest flights from Porto to Seattle

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:10 pm - 11:40 am

OPO

SEA

27h 30m

1 stop

1:40 pm - 10:30 am

SEA

OPO

12h 50m

1 stop

$862KLM

Mon, Feb 16 - Tue, Feb 24

5:00 am - 11:35 am

OPO

SEA

14h 35m

1 stop

4:05 pm - 10:25 pm

SEA

OPO

23h 20m

1 stop

$868Delta

Sun, Mar 1 - Sun, Mar 8

6:00 pm - 5:00 pm

OPO

SEA

31h 00m

3 stops

3:00 pm - 11:45 pm

SEA

OPO

25h 45m

2 stops

$870Multiple Airlines

Sun, Mar 1 - Sun, Mar 8

9:55 pm - 5:00 pm

OPO

SEA

27h 05m

3 stops

3:35 pm - 8:10 am

SEA

OPO

33h 35m

3 stops

$877Multiple Airlines

Sun, Mar 1 - Sun, Mar 8

6:00 am - 9:33 am

OPO

SEA

35h 33m

2 stops

8:00 pm - 3:40 pm

SEA

OPO

35h 40m

2 stops

$896Air Canada

Wed, Apr 15 - Sun, Apr 19

6:00 am - 11:27 pm

OPO

SEA

25h 27m

3 stops

7:00 am - 9:45 am

SEA

OPO

18h 45m

2 stops

$897United Airlines

Wed, Apr 15 - Sun, Apr 19

8:15 pm - 11:45 am

OPO

SEA

23h 30m

1 stop

6:40 pm - 9:40 pm

SEA

OPO

19h 00m

1 stop

$898Multiple Airlines

Fri, Apr 17 - Fri, Apr 24

6:00 am - 12:19 am

OPO

SEA

26h 19m

2 stops

2:10 pm - 3:40 pm

SEA

OPO

17h 30m

1 stop

$902United Airlines

Fri, Apr 17 - Sat, Apr 25

5:00 am - 7:01 pm

OPO

SEA

22h 01m

2 stops

6:40 pm - 9:40 pm

SEA

OPO

19h 00m

1 stop

$903Delta

Sat, Apr 18 - Fri, Apr 24

5:00 am - 12:35 pm

OPO

SEA

14h 35m

1 stop

9:00 am - 3:25 pm

SEA

OPO

23h 25m

2 stops

$904Delta

Mon, Mar 9 - Mon, Mar 16

Delta flights from Porto to Seattle

Our best Delta deals on Porto to Seattle flight tickets

Delta

Feb 16

OPO5:00 amPorto

14h 40m

1 stop

SEA11:40 amSeattle/Tacoma Intl

Feb 24

SEA1:40 pmSeattle/Tacoma Intl

12h 50m

1 stop

OPO10:30 amPorto

$862

Delta

Mar 1

OPO5:00 amPorto

20h 00m

2 stops

SEA5:00 pmSeattle/Tacoma Intl

Mar 8

SEA7:20 amSeattle/Tacoma Intl

20h 10m

2 stops

OPO10:30 amPorto

$868

Delta

Apr 18

OPO5:00 amPorto

22h 01m

2 stops

SEA7:01 pmSeattle/Tacoma Intl

Apr 24

SEA6:40 pmSeattle/Tacoma Intl

19h 00m

1 stop

OPO9:40 pmPorto

$903

United Airlines flights from Porto to Seattle

Our best United Airlines deals on Porto to Seattle flight tickets

United Airlines

Apr 15

OPO6:00 amPorto

25h 27m

3 stops

SEA11:27 pmSeattle/Tacoma Intl

Apr 19

SEA7:00 amSeattle/Tacoma Intl

18h 45m

2 stops

OPO9:45 amPorto

$897

United Airlines

Apr 17

OPO6:00 amPorto

26h 19m

2 stops

SEA12:19 amSeattle/Tacoma Intl

Apr 25

SEA2:10 pmSeattle/Tacoma Intl

17h 30m

1 stop

OPO3:40 pmPorto

$902

United Airlines

Feb 16

OPO12:30 pmPorto

42h 13m

2 stops

SEA10:43 pmSeattle/Tacoma Intl

Feb 24

SEA8:30 amSeattle/Tacoma Intl

17h 00m

2 stops

OPO9:30 amPorto

$918

Fly from

Fly to

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 2/16

4:10 pm-11:40 am

1 stop27h 30m

Seattle/Tacoma Intl

Tue 2/24

1:40 pm-10:30 am

1 stop12h 50m

$862

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 3/1

5:00 am-11:35 am

1 stop14h 35m

Seattle/Tacoma Intl

Sun 3/8

4:05 pm-10:25 pm

1 stop23h 20m

$868

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 3/1

6:00 pm-5:00 pm

3 stops31h 00m

Seattle/Tacoma Intl

Sun 3/8

3:00 pm-11:45 pm

2 stops25h 45m

$870

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 3/1

9:55 pm-5:00 pm

3 stops27h 05m

Seattle/Tacoma Intl

Sun 3/8

3:35 pm-8:10 am

3 stops33h 35m

$877

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 4/15

6:00 am-9:33 am

2 stops35h 33m

Seattle/Tacoma Intl

Sun 4/19

8:00 pm-3:40 pm

2 stops35h 40m

$896

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 4/15

6:00 am-11:27 pm

3 stops25h 27m

Seattle/Tacoma Intl

Sun 4/19

7:00 am-9:45 am

2 stops18h 45m

$897

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 4/17

8:15 pm-11:45 am

1 stop23h 30m

Seattle/Tacoma Intl

Fri 4/24

6:40 pm-9:40 pm

1 stop19h 00m

$898

PortoSeattle

OPO - SEA

OPOSEA

Porto

Fri 4/17

6:00 am-12:19 am

2 stops26h 19m

Seattle/Tacoma Intl

Sat 4/25

2:10 pm-3:40 pm

1 stop17h 30m

$902

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 4/18

5:00 am-7:01 pm

2 stops22h 01m

Seattle/Tacoma Intl

Fri 4/24

6:40 pm-9:40 pm

1 stop19h 00m

$903

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 3/9

5:00 am-12:35 pm

1 stop14h 35m

Seattle/Tacoma Intl

Mon 3/16

9:00 am-3:25 pm

2 stops23h 25m

$904

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

Can stopping save me money on Porto to Seattle flights?

You could potentially save up to 34% 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

Fastest flight time	14h 35m
Direct flights	None

The fastest flight from Porto to Seattle takes 14h 35m

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. 14h 35m 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 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.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Redmond

Puyallup

Cle Elum

Tukwila

Lakewood

Federal Way

Westport

Kirkland

Centralia

Fife

Tumwater

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.