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.

$486 Cheap Flights from Porto to Seattle in 2026

Find the cheapest flights from Porto to Seattle

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:00 am - 4:35 pm

OPO

SEA

19h 35m

1 stop

6:45 pm - 10:00 pm

SEA

OPO

19h 15m

1 stop

$875Delta

Thu, Oct 1 - Sat, Oct 17

8:25 am - 10:07 am

OPO

SEA

33h 42m

3 stops

7:00 pm - 6:50 am

SEA

OPO

27h 50m

3 stops

$926Multiple Airlines

Tue, Jul 21 - Mon, Jul 27

1:30 pm - 10:07 am

OPO

SEA

28h 37m

2 stops

7:00 pm - 6:50 am

SEA

OPO

27h 50m

3 stops

$962Multiple Airlines

Tue, Jul 21 - Mon, Jul 27

8:55 am - 5:55 pm

OPO

SEA

17h 00m

2 stops

3:40 pm - 8:25 pm

SEA

OPO

20h 45m

3 stops

$978Multiple Airlines

Tue, Aug 18 - Fri, Aug 28

6:00 am - 9:59 pm

OPO

SEA

23h 59m

2 stops

6:50 am - 9:30 am

SEA

OPO

19h 40m

1 stop

$985United Airlines

Thu, Oct 22 - Mon, Oct 26

12:35 pm - 9:55 pm

OPO

SEA

17h 20m

1 stop

6:50 am - 9:30 am

SEA

OPO

19h 40m

1 stop

$1,009United Airlines

Thu, Oct 22 - Mon, Oct 26

11:00 am - 11:45 am

OPO

SEA

32h 45m

3 stops

3:40 pm - 8:10 am

SEA

OPO

32h 30m

3 stops

$1,026Multiple Airlines

Tue, Aug 18 - Fri, Aug 28

8:10 pm - 3:40 pm

OPO

SEA

27h 30m

2 stops

6:10 pm - 6:50 am

SEA

OPO

28h 40m

2 stops

$1,056Multiple Airlines

Tue, Jul 21 - Mon, Jul 27

4:50 pm - 5:20 pm

OPO

SEA

32h 30m

1 stop

12:35 pm - 3:50 pm

SEA

OPO

19h 15m

1 stop

$1,057Turkish Airlines

Tue, Jul 21 - Mon, Jul 27

7:00 am - 9:40 am

OPO

SEA

34h 40m

3 stops

3:40 pm - 10:00 am

SEA

OPO

34h 20m

3 stops

$1,062Multiple Airlines

Thu, Oct 1 - Sat, Oct 17

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Delta flights from Porto to Seattle

Our best Delta deals on Porto to Seattle flight tickets

Delta

Oct 1

OPO5:00 amPorto

19h 35m

1 stop

SEA4:35 pmSeattle/Tacoma Intl

Oct 17

SEA6:45 pmSeattle/Tacoma Intl

19h 15m

1 stop

OPO10:00 pmPorto

$875

Delta

Aug 5

OPO5:00 amPorto

19h 27m

1 stop

SEA4:27 pmSeattle/Tacoma Intl

Aug 12

SEA6:40 pmSeattle/Tacoma Intl

19h 20m

1 stop

OPO10:00 pmPorto

$1,105

Delta

Jul 11

OPO5:00 amPorto

19h 20m

1 stop

SEA4:20 pmSeattle/Tacoma Intl

Jul 22

SEA9:30 amSeattle/Tacoma Intl

17h 10m

2 stops

OPO10:40 amPorto

$1,109

United Airlines flights from Porto to Seattle

Our best United Airlines deals on Porto to Seattle flight tickets

United Airlines

Oct 22

OPO6:00 amPorto

23h 59m

2 stops

SEA9:59 pmSeattle/Tacoma Intl

Oct 26

SEA6:50 amSeattle/Tacoma Intl

19h 40m

1 stop

OPO9:30 amPorto

$985

United Airlines

Oct 22

OPO12:35 pmPorto

17h 20m

1 stop

SEA9:55 pmSeattle/Tacoma Intl

Oct 26

SEA6:50 amSeattle/Tacoma Intl

19h 40m

1 stop

OPO9:30 amPorto

$1,009

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/1

5:00 am-4:35 pm

1 stop19h 35m

Seattle/Tacoma Intl

Sat 10/17

6:45 pm-10:00 pm

1 stop19h 15m

$875

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 7/21

8:25 am-10:07 am

3 stops33h 42m

Seattle/Tacoma Intl

Mon 7/27

7:00 pm-6:50 am

3 stops27h 50m

$926

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 7/21

1:30 pm-10:07 am

2 stops28h 37m

Seattle/Tacoma Intl

Mon 7/27

7:00 pm-6:50 am

3 stops27h 50m

$962

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 8/18

8:55 am-5:55 pm

2 stops17h 00m

Seattle/Tacoma Intl

Fri 8/28

3:40 pm-8:25 pm

3 stops20h 45m

$978

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/22

6:00 am-9:59 pm

2 stops23h 59m

Seattle/Tacoma Intl

Mon 10/26

6:50 am-9:30 am

1 stop19h 40m

$985

Quickest round-trip

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/22

12:35 pm-9:55 pm

1 stop17h 20m

Seattle/Tacoma Intl

Mon 10/26

6:50 am-9:30 am

1 stop19h 40m

$1,009

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 8/18

11:00 am-11:45 am

3 stops32h 45m

Seattle/Tacoma Intl

Fri 8/28

3:40 pm-8:10 am

3 stops32h 30m

$1,026

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 7/21

8:10 pm-3:40 pm

2 stops27h 30m

Seattle/Tacoma Intl

Mon 7/27

6:10 pm-6:50 am

2 stops28h 40m

$1,056

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 7/21

4:50 pm-5:20 pm

1 stop32h 30m

Seattle/Tacoma Intl

Mon 7/27

12:35 pm-3:50 pm

1 stop19h 15m

$1,057

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 10/1

7:00 am-9:40 am

3 stops34h 40m

Seattle/Tacoma Intl

Sat 10/17

3:40 pm-10:00 am

3 stops34h 20m

$1,062

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 month to fly to Seattle?

In general, February is the cheapest month to fly from Porto to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. If you don’t want to visit Seattle in February, then you should wait until May to fly from Porto, when ticket prices are also cheap, with an average price of $805.

Can stopping save me money on Porto to Seattle flights?

You could potentially save up to 17% 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	17h 00m
Direct flights	None

The fastest flight from Porto to Seattle takes 17h 00m

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

Search flight deals

Frequently asked questions about flying from Porto to Seattle

How far is Porto to Seattle/Tacoma Intl by plane?
Seattle/Tacoma Intl is 5083.1 mi away from Porto. 17h 00m 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

Redmond

Kent

Lakewood

Puyallup

Tukwila

Federal Way

Fife

Cle Elum

Marysville

Centralia

Shoreline

Kirkland

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.