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.

$368 Cheap Flights from Porto to Seattle in 2025/26

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Find the cheapest flights from Porto to Seattle

Round-trip

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8:50 am - 10:16 pm

OPO

SEA

21h 26m1 stop

2:35 pm - 2:10 pm

SEA

OPO

15h 35m2 stops

$800Multiple Airlines

Sat, Jan 31 - Sat, Feb 7

6:55 am - 10:16 pm

OPO

SEA

23h 21m2 stops

2:35 pm - 2:10 pm

SEA

OPO

15h 35m2 stops

$807Multiple Airlines

Sat, Jan 31 - Sat, Feb 7

7:05 am - 5:00 pm

OPO

SEA

17h 55m2 stops

2:35 pm - 10:00 pm

SEA

OPO

23h 25m3 stops

$844Multiple Airlines

Sat, Jan 31 - Sat, Feb 7

6:15 am - 10:16 pm

OPO

SEA

24h 01m2 stops

10:05 am - 3:15 pm

SEA

OPO

22h 10m2 stops

$888Air Canada

Mon, Feb 23 - Sun, Mar 8

6:00 am - 11:00 pm

OPO

SEA

25h 00m2 stops

12:25 pm - 9:30 am

SEA

OPO

14h 05m1 stop

$891United Airlines

Mon, Feb 23 - Sun, Mar 8

4:10 pm - 11:40 am

OPO

SEA

27h 30m1 stop

3:10 pm - 10:30 am

SEA

OPO

36h 20m1 stop

$893Multiple Airlines

Mon, Feb 23 - Sun, Mar 8

6:00 am - 8:57 pm

OPO

SEA

22h 57m2 stops

7:00 am - 12:50 pm

SEA

OPO

21h 50m2 stops

$895Lufthansa

Sun, Jan 18 - Tue, Jan 27

11:15 am - 11:40 am

OPO

SEA

32h 25m1 stop

9:00 am - 10:30 am

SEA

OPO

18h 30m2 stops

$897KLM

Mon, Feb 23 - Sun, Mar 8

6:00 am - 10:16 pm

OPO

SEA

24h 16m2 stops

8:10 am - 10:25 pm

SEA

OPO

30h 15m2 stops

$901Multiple Airlines

Sun, Jan 18 - Tue, Jan 27

4:10 pm - 2:44 pm

OPO

SEA

30h 34m2 stops

12:06 pm - 10:30 am

SEA

OPO

15h 24m2 stops

$903KLM

Mon, Feb 23 - Sun, Mar 8

Air Canada flights from Porto to Seattle

Our best Air Canada deals on Porto to Seattle flight tickets

Air Canada

Feb 23

OPO6:15 amPorto

24h 01m

2 stops

SEA10:16 pmSeattle/Tacoma Intl

Mar 8

SEA10:05 amSeattle/Tacoma Intl

22h 10m

2 stops

OPO3:15 pmPorto

$888

Find similar

Air Canada

Jan 22

OPO6:00 amPorto

24h 16m

2 stops

SEA10:16 pmSeattle/Tacoma Intl

Jan 25

SEA8:10 amSeattle/Tacoma Intl

19h 30m

2 stops

OPO11:40 amPorto

$920

Find similar

Air Canada

Jan 5

OPO8:30 amPorto

21h 36m

3 stops

SEA10:06 pmSeattle/Tacoma Intl

Jan 13

SEA8:10 amSeattle/Tacoma Intl

20h 40m

2 stops

OPO12:50 pmPorto

$2,387

Find similar

United Airlines flights from Porto to Seattle

Our best United Airlines deals on Porto to Seattle flight tickets

United Airlines

Feb 23

OPO6:00 amPorto

25h 00m

2 stops

SEA11:00 pmSeattle/Tacoma Intl

Mar 8

SEA12:25 pmSeattle/Tacoma Intl

14h 05m

1 stop

OPO9:30 amPorto

$891

Find similar

United Airlines

Jan 22

OPO6:00 amPorto

24h 43m

3 stops

SEA10:43 pmSeattle/Tacoma Intl

Jan 25

SEA8:10 amSeattle/Tacoma Intl

43h 30m

2 stops

OPO11:40 amPorto

$928

Find similar

United Airlines

Jan 22

OPO6:00 amPorto

24h 43m

3 stops

SEA10:43 pmSeattle/Tacoma Intl

Jan 25

SEA8:10 amSeattle/Tacoma Intl

43h 30m

2 stops

OPO11:40 amPorto

$930

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 1/31

8:50 am-10:16 pm

1 stop21h 26m

Seattle/Tacoma Intl

Sat 2/7

2:35 pm-2:10 pm

2 stops15h 35m

$800

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 1/31

6:55 am-10:16 pm

2 stops23h 21m

Seattle/Tacoma Intl

Sat 2/7

2:35 pm-2:10 pm

2 stops15h 35m

$807

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sat 1/31

7:05 am-5:00 pm

2 stops17h 55m

Seattle/Tacoma Intl

Sat 2/7

2:35 pm-10:00 pm

3 stops23h 25m

$844

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 2/23

6:15 am-10:16 pm

2 stops24h 01m

Seattle/Tacoma Intl

Sun 3/8

10:05 am-3:15 pm

2 stops22h 10m

$888

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 2/23

6:00 am-11:00 pm

2 stops25h 00m

Seattle/Tacoma Intl

Sun 3/8

12:25 pm-9:30 am

1 stop14h 05m

$891

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 2/23

4:10 pm-11:40 am

1 stop27h 30m

Seattle/Tacoma Intl

Sun 3/8

3:10 pm-10:30 am

1 stop36h 20m

$893

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 1/18

6:00 am-8:57 pm

2 stops22h 57m

Seattle/Tacoma Intl

Tue 1/27

7:00 am-12:50 pm

2 stops21h 50m

$895

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 2/23

11:15 am-11:40 am

1 stop32h 25m

Seattle/Tacoma Intl

Sun 3/8

9:00 am-10:30 am

2 stops18h 30m

$897

PortoSeattle

OPO - SEA

OPOSEA

Porto

Sun 1/18

6:00 am-10:16 pm

2 stops24h 16m

Seattle/Tacoma Intl

Tue 1/27

8:10 am-10:25 pm

2 stops30h 15m

$901

PortoSeattle

OPO - SEA

OPOSEA

Porto

Mon 2/23

4:10 pm-2:44 pm

2 stops30h 34m

Seattle/Tacoma Intl

Sun 3/8

12:06 pm-10:30 am

2 stops15h 24m

$903

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

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

Fastest flight time	31h 40m
Direct flights	None

The fastest flight from Porto to Seattle takes 31h 40m

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. 31h 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

Marysville

Puyallup

Redmond

Tukwila

Cle Elum

Federal Way

Lakewood

Fife

Centralia

Westport

Kirkland

Shoreline

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.