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.

$737 Cheap Flights from Porto to Seattle in 2025/26

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Find the cheapest flights from Porto to Seattle

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9:55 am - 10:25 pmOPO-SEA

20h 30m2 stops

8:00 am - 10:30 amSEA-OPO

18h 30m2 stops

$866KLM

Find Deal

Tue, Dec 16 - Mon, Jan 12

6:05 am - 8:35 pmOPO-SEA

22h 30m2 stops

2:10 pm - 10:30 amSEA-OPO

36h 20m1 stop

$868Multiple Airlines

Find Deal

Tue, Dec 16 - Mon, Jan 12

1:45 pm - 1:20 pmOPO-SEA

31h 35m1 stop

2:00 pm - 2:55 pmSEA-OPO

16h 55m1 stop

$884Lufthansa

Find Deal

Tue, Dec 16 - Mon, Jan 12

6:00 am - 10:28 pmOPO-SEA

24h 28m2 stops

7:30 pm - 11:40 amSEA-OPO

32h 10m3 stops

$887United Airlines

Find Deal

Tue, Dec 16 - Mon, Jan 12

2:05 pm - 2:20 pmOPO-SEA

31h 15m1 stop

2:10 pm - 3:45 pmSEA-OPO

17h 35m1 stop

$894Lufthansa

Find Deal

Thu, Mar 26 - Mon, Mar 30

12:30 pm - 1:10 pmOPO-SEA

31h 40m1 stop

8:00 am - 9:45 amSEA-OPO

17h 45m2 stops

$896United Airlines

Find Deal

Thu, Mar 26 - Mon, Mar 30

12:30 pm - 1:10 pmOPO-SEA

31h 40m1 stop

7:00 am - 9:45 amSEA-OPO

18h 45m2 stops

$898United Airlines

Find Deal

Thu, Mar 26 - Mon, Mar 30

2:05 pm - 2:20 pmOPO-SEA

31h 15m1 stop

2:20 pm - 3:45 pmSEA-OPO

17h 25m1 stop

$899Lufthansa

Find Deal

Thu, Mar 26 - Mon, Mar 30

11:20 am - 11:25 amOPO-SEA

31h 05m2 stops

6:00 am - 3:30 pmSEA-OPO

25h 30m2 stops

$906Delta

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Thu, Mar 26 - Mon, Mar 30

11:20 am - 11:25 amOPO-SEA

31h 05m2 stops

6:00 am - 3:30 pmSEA-OPO

25h 30m2 stops

$1,014Delta

Find Deal

Thu, Mar 26 - Mon, Mar 30

Delta flights from Porto to Seattle

Our best Delta deals on Porto to Seattle flight tickets

Delta

Mar 26

OPO11:20 amPorto

31h 05m

2 stops

SEA11:25 amSeattle/Tacoma Intl

Mar 30

SEA6:00 amSeattle/Tacoma Intl

25h 30m

2 stops

OPO3:30 pmPorto

$906

Find similar

Delta

Mar 26

OPO11:20 amPorto

31h 05m

2 stops

SEA11:25 amSeattle/Tacoma Intl

Mar 30

SEA6:00 amSeattle/Tacoma Intl

25h 30m

2 stops

OPO3:30 pmPorto

$1,014

Find similar

Delta

Mar 26

OPO11:20 amPorto

31h 05m

2 stops

SEA11:25 amSeattle/Tacoma Intl

Mar 30

SEA6:00 amSeattle/Tacoma Intl

25h 30m

2 stops

OPO3:30 pmPorto

$1,017

Find similar

United Airlines flights from Porto to Seattle

Our best United Airlines deals on Porto to Seattle flight tickets

United Airlines

Dec 16

OPO6:00 amPorto

24h 28m

2 stops

SEA10:28 pmSeattle/Tacoma Intl

Jan 12

SEA7:30 pmSeattle/Tacoma Intl

32h 10m

3 stops

OPO11:40 amPorto

$887

Find similar

United Airlines

Mar 26

OPO12:30 pmPorto

31h 40m

1 stop

SEA1:10 pmSeattle/Tacoma Intl

Mar 30

SEA8:00 amSeattle/Tacoma Intl

17h 45m

2 stops

OPO9:45 amPorto

$896

Find similar

United Airlines

Mar 26

OPO12:30 pmPorto

31h 40m

1 stop

SEA1:10 pmSeattle/Tacoma Intl

Mar 30

SEA7:00 amSeattle/Tacoma Intl

18h 45m

2 stops

OPO9:45 amPorto

$898

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 12/16

9:55 am-10:25 pm

2 stops20h 30m

Seattle/Tacoma Intl

Mon 1/12

8:00 am-10:30 am

2 stops18h 30m

$866

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 12/16

6:05 am-8:35 pm

2 stops22h 30m

Seattle/Tacoma Intl

Mon 1/12

2:10 pm-10:30 am

1 stop36h 20m

$868

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 12/16

1:45 pm-1:20 pm

1 stop31h 35m

Seattle/Tacoma Intl

Mon 1/12

2:00 pm-2:55 pm

1 stop16h 55m

$884

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 12/16

6:00 am-10:28 pm

2 stops24h 28m

Seattle/Tacoma Intl

Mon 1/12

7:30 pm-11:40 am

3 stops32h 10m

$887

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/26

2:05 pm-2:20 pm

1 stop31h 15m

Seattle/Tacoma Intl

Mon 3/30

2:10 pm-3:45 pm

1 stop17h 35m

$894

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/26

12:30 pm-1:10 pm

1 stop31h 40m

Seattle/Tacoma Intl

Mon 3/30

8:00 am-9:45 am

2 stops17h 45m

$896

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/26

12:30 pm-1:10 pm

1 stop31h 40m

Seattle/Tacoma Intl

Mon 3/30

7:00 am-9:45 am

2 stops18h 45m

$898

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/26

2:05 pm-2:20 pm

1 stop31h 15m

Seattle/Tacoma Intl

Mon 3/30

2:20 pm-3:45 pm

1 stop17h 25m

$899

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/26

11:20 am-11:25 am

2 stops31h 05m

Seattle/Tacoma Intl

Mon 3/30

6:00 am-3:30 pm

2 stops25h 30m

$906

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/26

11:20 am-11:25 am

2 stops31h 05m

Seattle/Tacoma Intl

Mon 3/30

6:00 am-3:30 pm

2 stops25h 30m

$1,014

Flights are sorted by cheapest round-trip flights first.

Sorted 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

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 22% 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.

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How far is Porto to Seattle/Tacoma Intl by plane?
Seattle/Tacoma Intl is 5083.1 mi away from Porto. 17h 40m 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

Puyallup

Marysville

Redmond

Tukwila

Federal Way

Lakewood

Cle Elum

Fife

Centralia

Kirkland

Shoreline

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.