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.

$499 Cheap Flights from Porto to Seattle in 2026

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.

6:40 am - 8:40 pmOPO Porto-SEA Seattle/Tacoma Intl

22h 00m2 stops London Gatwick Reykjavik Keflavik Intl

7:00 pm - 11:20 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 20m2 stops Reykjavik Keflavik Intl London Gatwick

$917Multiple Airlines

Thu, Sep 10 - Mon, Sep 21

4:40 pm - 10:56 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 16m2 stops Istanbul Chicago O'Hare Intl

10:50 am - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

44h 35m2 stops Chicago O'Hare Intl Istanbul

$921Turkish Airlines

Wed, Oct 21 - Wed, Nov 4

4:20 pm - 11:47 amOPO Porto-SEA Seattle/Tacoma Intl

27h 27m1 stop Amsterdam Schiphol

6:45 pm - 10:00 pmSEA Seattle/Tacoma Intl-OPO Porto

19h 15m1 stop Paris Charles de Gaulle

$932Multiple Airlines

Sun, Sep 20 - Sun, Sep 27

6:40 am - 8:40 pmOPO Porto-SEA Seattle/Tacoma Intl

22h 00m2 stops London Gatwick Reykjavik Keflavik Intl

3:40 pm - 6:50 amSEA Seattle/Tacoma Intl-OPO Porto

31h 10m3 stops Reykjavik Keflavik Intl London Gatwick Madrid Barajas

$941Multiple Airlines

Thu, Sep 10 - Mon, Sep 21

10:45 am - 5:20 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 35m1 stop Istanbul

10:50 am - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

44h 35m2 stops Chicago O'Hare Intl Istanbul

$961Turkish Airlines

Wed, Oct 21 - Wed, Nov 4

5:00 am - 11:47 amOPO Porto-SEA Seattle/Tacoma Intl

14h 47m1 stop Amsterdam Schiphol

6:45 pm - 10:00 pmSEA Seattle/Tacoma Intl-OPO Porto

19h 15m1 stop Paris Charles de Gaulle

$962Delta

Thu, Sep 10 - Mon, Sep 21

5:00 am - 4:35 pmOPO Porto-SEA Seattle/Tacoma Intl

19h 35m1 stop Amsterdam Schiphol

3:25 pm - 10:00 pmSEA Seattle/Tacoma Intl-OPO Porto

22h 35m1 stop Paris Charles de Gaulle

$963Delta

Wed, Oct 21 - Wed, Nov 4

10:00 pm - 8:40 pmOPO Porto-SEA Seattle/Tacoma Intl

30h 40m3 stops Barcelona-El Prat London Gatwick Reykjavik Keflavik Intl

3:40 pm - 11:40 pmSEA Seattle/Tacoma Intl-OPO Porto

24h 00m2 stops Reykjavik Keflavik Intl London Gatwick

$965Multiple Airlines

Tue, Sep 1 - Tue, Sep 8

5:00 am - 6:36 pmOPO Porto-SEA Seattle/Tacoma Intl

21h 36m2 stops Amsterdam Schiphol Salt Lake City

6:45 pm - 10:30 pmSEA Seattle/Tacoma Intl-OPO Porto

19h 45m1 stop Paris Charles de Gaulle

$967Delta

Tue, Sep 8 - Mon, Sep 14

6:15 am - 5:43 pmOPO Porto-SEA Seattle/Tacoma Intl

19h 28m1 stop Paris Charles de Gaulle

6:45 pm - 10:05 pmSEA Seattle/Tacoma Intl-OPO Porto

19h 20m1 stop Paris Charles de Gaulle

$968Delta

Tue, Sep 1 - Tue, Sep 8

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Scandinavian Airlines flights from Porto to Seattle

Our best Scandinavian Airlines deals on Porto to Seattle flight tickets

Scandinavian Airlines

Nov 13

OPO5:45 pmPorto

36h 19m

2 stops

SEA10:04 pmSeattle/Tacoma Intl

Nov 16

SEA7:20 amSeattle/Tacoma Intl

43h 45m

2 stops

OPO11:05 amPorto

$986

Scandinavian Airlines

Nov 13

OPO5:45 pmPorto

36h 19m

2 stops

SEA10:04 pmSeattle/Tacoma Intl

Nov 16

SEA7:20 amSeattle/Tacoma Intl

43h 45m

2 stops

OPO11:05 amPorto

$987

Scandinavian Airlines

Nov 13

OPO5:45 pmPorto

36h 19m

2 stops

SEA10:04 pmSeattle/Tacoma Intl

Nov 16

SEA7:20 amSeattle/Tacoma Intl

43h 45m

2 stops

OPO11:05 amPorto

$988

United Airlines flights from Porto to Seattle

Our best United Airlines deals on Porto to Seattle flight tickets

United Airlines

Nov 13

OPO6:00 amPorto

23h 19m

2 stops

SEA9:19 pmSeattle/Tacoma Intl

Nov 16

SEA6:45 amSeattle/Tacoma Intl

18h 45m

1 stop

OPO9:30 amPorto

$996

United Airlines

Nov 13

OPO6:00 amPorto

23h 19m

2 stops

SEA9:19 pmSeattle/Tacoma Intl

Nov 16

SEA6:45 amSeattle/Tacoma Intl

18h 45m

1 stop

OPO9:30 amPorto

$997

United Airlines

Nov 13

OPO6:00 amPorto

23h 19m

2 stops

SEA9:19 pmSeattle/Tacoma Intl

Nov 16

SEA6:45 amSeattle/Tacoma Intl

18h 45m

1 stop

OPO9:30 amPorto

$998

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Thu 9/10

6:40 am-8:40 pm

2 stops22h 00m

Seattle/Tacoma Intl

Mon 9/21

7:00 pm-11:20 pm

2 stops20h 20m

$917

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Wed 10/21

4:40 pm-10:56 pm

2 stops38h 16m

Seattle/Tacoma Intl

Wed 11/4

10:50 am-3:25 pm

2 stops44h 35m

$921

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Sun 9/20

4:20 pm-11:47 am

1 stop27h 27m

Seattle/Tacoma Intl

Sun 9/27

6:45 pm-10:00 pm

1 stop19h 15m

$932

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Thu 9/10

6:40 am-8:40 pm

2 stops22h 00m

Seattle/Tacoma Intl

Mon 9/21

3:40 pm-6:50 am

3 stops31h 10m

$941

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Wed 10/21

10:45 am-5:20 pm

1 stop38h 35m

Seattle/Tacoma Intl

Wed 11/4

10:50 am-3:25 pm

2 stops44h 35m

$961

Quickest round-trip

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Thu 9/10

5:00 am-11:47 am

1 stop14h 47m

Seattle/Tacoma Intl

Mon 9/21

6:45 pm-10:00 pm

1 stop19h 15m

$962

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Wed 10/21

5:00 am-4:35 pm

1 stop19h 35m

Seattle/Tacoma Intl

Wed 11/4

3:25 pm-10:00 pm

1 stop22h 35m

$963

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Tue 9/1

10:00 pm-8:40 pm

3 stops30h 40m

Seattle/Tacoma Intl

Tue 9/8

3:40 pm-11:40 pm

2 stops24h 00m

$965

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Tue 9/8

5:00 am-6:36 pm

2 stops21h 36m

Seattle/Tacoma Intl

Mon 9/14

6:45 pm-10:30 pm

1 stop19h 45m

$967

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Tue 9/1

6:15 am-5:43 pm

1 stop19h 28m

Seattle/Tacoma Intl

Tue 9/8

6:45 pm-10:05 pm

1 stop19h 20m

$968

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 typical price of a round-trip flight between Porto and Seattle?

Prices are currently low for flights on this route.

Typical prices usually range from $932 to $1,319.
The lowest price recently found on this route was $886.

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 18% 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	19h 27m
Direct flights	None

The fastest flight from Porto to Seattle takes 19h 27m

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. 19h 27m 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

Kent

Lynnwood

Redmond

Lakewood

Puyallup

Fife

Federal Way

Tukwila

Cle Elum

Marysville

Kirkland

Centralia

Shoreline

Lacey

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.