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.

$440 Cheap Flights from Porto to Seattle in 2026/27

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.

6:35 am - 7:00 pmOPO Porto-SEA Seattle/Tacoma Intl

20h 25m2 stops Valencia London Stansted

6:45 pm - 8:30 pmSEA Seattle/Tacoma Intl-OPO Porto

17h 45m1 stop London Heathrow

$691Multiple Airlines

Wed, Oct 21 - Wed, Nov 11

7:05 am - 7:00 pmOPO Porto-SEA Seattle/Tacoma Intl

19h 55m1 stop London Stansted

6:45 pm - 8:30 pmSEA Seattle/Tacoma Intl-OPO Porto

17h 45m1 stop London Heathrow

$712Multiple Airlines

Wed, Oct 21 - Wed, Nov 11

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

33h 00m3 stops Lisbon Humberto Delgado London Gatwick Reykjavik Keflavik Intl

2:35 pm - 8:10 amSEA Seattle/Tacoma Intl-OPO Porto

33h 35m3 stops Reykjavik Keflavik Intl London Heathrow Barcelona-El Prat

$757Multiple Airlines

Sun, Nov 8 - Mon, Nov 16

10:55 am - 6:10 pmOPO Porto-SEA Seattle/Tacoma Intl

39h 15m1 stop Istanbul

8:05 pm - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

35h 20m1 stop Istanbul

$797Turkish Airlines

Sun, Nov 1 - Thu, Nov 5

4:25 pm - 6:10 pmOPO Porto-SEA Seattle/Tacoma Intl

33h 45m1 stop Istanbul

8:05 pm - 9:55 amSEA Seattle/Tacoma Intl-OPO Porto

29h 50m1 stop Istanbul

$800Turkish Airlines

Sun, Nov 1 - Thu, Nov 5

6:05 am - 6:05 pmOPO Porto-SEA Seattle/Tacoma Intl

19h 00m1 stop London Stansted

6:45 pm - 11:10 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 25m2 stops London Heathrow Lyon-Saint Exupéry

$802Multiple Airlines

Fri, Oct 30 - Tue, Nov 3

6:05 am - 6:05 pmOPO Porto-SEA Seattle/Tacoma Intl

19h 00m1 stop London Stansted

6:45 pm - 11:10 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 25m1 stop London Heathrow

$810Multiple Airlines

Fri, Oct 30 - Tue, Nov 3

10:55 am - 6:10 pmOPO Porto-SEA Seattle/Tacoma Intl

39h 15m1 stop Istanbul

10:50 am - 9:55 amSEA Seattle/Tacoma Intl-OPO Porto

39h 05m2 stops Chicago O'Hare Intl Istanbul

$852Turkish Airlines

Sun, Nov 1 - Thu, Nov 5

9:55 pm - 5:00 pmOPO Porto-SEA Seattle/Tacoma Intl

27h 05m3 stops Barcelona-El Prat London Gatwick Reykjavik Keflavik Intl

2:35 pm - 7:20 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 45m2 stops Reykjavik Keflavik Intl London Gatwick

$852Multiple Airlines

Sun, Nov 1 - Thu, Nov 5

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

14h 47m1 stop Amsterdam Schiphol

7:38 am - 10:35 amSEA Seattle/Tacoma Intl-OPO Porto

18h 57m2 stops Boston Logan Intl Paris Charles de Gaulle

$881Delta

Sun, Nov 8 - Mon, Nov 16

Cheap last minute flights

Enter your travel dates to find the best prices.

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

19h 35m1 stop Amsterdam Schiphol

11:45 am - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

19h 40m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

$881Delta

Fri, Sep 25 - Tue, Sep 29

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

19h 35m1 stop Amsterdam Schiphol

1:30 pm - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

17h 55m1 stop Paris Charles de Gaulle

$881KLM

Fri, Sep 25 - Tue, Sep 29

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

19h 35m2 stops Amsterdam Schiphol Portland

11:45 am - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

19h 40m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

$887Delta

Fri, Sep 25 - Tue, Sep 29

8:35 am - 11:15 amOPO Porto-SEA Seattle/Tacoma Intl

34h 40m3 stops Barcelona-El Prat London Gatwick Paris Charles de Gaulle

1:30 pm - 8:00 amSEA Seattle/Tacoma Intl-OPO Porto

34h 30m3 stops Paris Charles de Gaulle London Gatwick Barcelona-El Prat

$910Multiple Airlines

Fri, Sep 25 - Tue, Sep 29

8:20 am - 9:36 pmOPO Porto-SEA Seattle/Tacoma Intl

21h 16m2 stops Madrid Barajas Chicago O'Hare Intl

12:02 pm - 4:00 pmSEA Seattle/Tacoma Intl-OPO Porto

19h 58m2 stops Dallas/Fort Worth Madrid Barajas

$978American Airlines

Fri, Sep 25 - Tue, Sep 29

12:35 pm - 9:55 pmOPO Porto-SEA Seattle/Tacoma Intl

17h 20m1 stop Newark

7:00 am - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

18h 45m1 stop Newark

$1,148United Airlines

Fri, Sep 25 - Tue, Sep 29

12:35 pm - 9:55 pmOPO Porto-SEA Seattle/Tacoma Intl

17h 20m1 stop Newark

8:25 am - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

17h 20m2 stops Washington, D.C. Dulles Intl Newark

$1,148United Airlines

Fri, Sep 25 - Tue, Sep 29

12:15 pm - 9:39 pmOPO Porto-SEA Seattle/Tacoma Intl

41h 24m3 stops Zurich Hong Kong Intl Los Angeles

11:45 am - 5:25 pmSEA Seattle/Tacoma Intl-OPO Porto

45h 40m2 stops Hong Kong Intl Brussels Bruxelles-National

$16,850Multiple Airlines

Fri, Sep 25 - Tue, Sep 29

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Turkish Airlines flights from Porto to Seattle

Our best Turkish Airlines deals on Porto to Seattle flight tickets

Turkish Airlines

Nov 1

OPO10:55 amPorto

39h 15m

1 stop

SEA6:10 pmSeattle/Tacoma Intl

Nov 5

SEA8:05 pmSeattle/Tacoma Intl

35h 20m

1 stop

OPO3:25 pmPorto

$797

Turkish Airlines

Nov 1

OPO4:25 pmPorto

33h 45m

1 stop

SEA6:10 pmSeattle/Tacoma Intl

Nov 5

SEA8:05 pmSeattle/Tacoma Intl

29h 50m

1 stop

OPO9:55 amPorto

$800

Turkish Airlines

Nov 5

OPO4:25 pmPorto

33h 45m

1 stop

SEA6:10 pmSeattle/Tacoma Intl

Nov 29

SEA7:05 pmSeattle/Tacoma Intl

36h 05m

1 stop

OPO3:10 pmPorto

$817

Delta flights from Porto to Seattle

Our best Delta deals on Porto to Seattle flight tickets

Delta

Nov 8

OPO5:00 amPorto

14h 47m

1 stop

SEA11:47 amSeattle/Tacoma Intl

Nov 16

SEA3:25 pmSeattle/Tacoma Intl

22h 35m

1 stop

OPO10:00 pmPorto

$881

Delta

Sep 28

OPO5:00 amPorto

19h 35m

1 stop

SEA4:35 pmSeattle/Tacoma Intl

Oct 5

SEA6:40 pmSeattle/Tacoma Intl

19h 20m

1 stop

OPO10:00 pmPorto

$882

Delta

Nov 8

OPO5:00 amPorto

22h 05m

2 stops

SEA7:05 pmSeattle/Tacoma Intl

Nov 16

SEA7:15 amSeattle/Tacoma Intl

19h 20m

2 stops

OPO10:35 amPorto

$887

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Wed 10/21

6:35 am-7:00 pm

2 stops20h 25m

Seattle/Tacoma Intl

Wed 11/11

6:45 pm-8:30 pm

1 stop17h 45m

$691

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Wed 10/21

7:05 am-7:00 pm

1 stop19h 55m

Seattle/Tacoma Intl

Wed 11/11

6:45 pm-8:30 pm

1 stop17h 45m

$712

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Sun 11/8

4:00 pm-5:00 pm

3 stops33h 00m

Seattle/Tacoma Intl

Mon 11/16

2:35 pm-8:10 am

3 stops33h 35m

$757

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Sun 11/1

10:55 am-6:10 pm

1 stop39h 15m

Seattle/Tacoma Intl

Thu 11/5

8:05 pm-3:25 pm

1 stop35h 20m

$797

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Sun 11/1

4:25 pm-6:10 pm

1 stop33h 45m

Seattle/Tacoma Intl

Thu 11/5

8:05 pm-9:55 am

1 stop29h 50m

$800

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Fri 10/30

6:05 am-6:05 pm

1 stop19h 00m

Seattle/Tacoma Intl

Tue 11/3

6:45 pm-11:10 pm

2 stops20h 25m

$802

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Fri 10/30

6:05 am-6:05 pm

1 stop19h 00m

Seattle/Tacoma Intl

Tue 11/3

6:45 pm-11:10 pm

1 stop20h 25m

$810

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Sun 11/1

10:55 am-6:10 pm

1 stop39h 15m

Seattle/Tacoma Intl

Thu 11/5

10:50 am-9:55 am

2 stops39h 05m

$852

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Sun 11/1

9:55 pm-5:00 pm

3 stops27h 05m

Seattle/Tacoma Intl

Thu 11/5

2:35 pm-7:20 pm

2 stops20h 45m

$852

Quickest round-trip

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Sun 11/8

5:00 am-11:47 am

1 stop14h 47m

Seattle/Tacoma Intl

Mon 11/16

7:38 am-10:35 am

2 stops18h 57m

$881

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 $891 to $965.
The lowest price recently found on this route was $691.

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 32% 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

Best Price Found	$440
Fastest flight time	19h 00m
Direct flights	None

The best one-way flight to Seattle from Porto in the past 72 hours is $440. The best round-trip flight deal from Porto to Seattle found on momondo in the last 72 hours is $691.

The fastest flight from Porto to Seattle takes 19h 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. 19h 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

Kent

Redmond

Lakewood

Federal Way

Fife

Tukwila

Puyallup

Lynnwood

Cle Elum

Marysville

Lacey

Centralia

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.