What is the cheapest airline that flies from Porto to Seattle/Tacoma Intl?

Turkish Airlines and United Airlines are the most popular carriers 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.

$506 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.

10:55 am - 5:10 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 15m1 stop Istanbul

7:05 pm - 9:55 amSEA Seattle/Tacoma Intl-OPO Porto

30h 50m1 stop Istanbul

$993Turkish Airlines

Fri, Jan 15 - Sun, Jan 17

10:55 am - 5:10 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 15m1 stop Istanbul

7:05 pm - 9:55 amSEA Seattle/Tacoma Intl-OPO Porto

30h 50m1 stop Istanbul

$994Turkish Airlines

Fri, Jan 15 - Sun, Jan 17

10:55 am - 5:10 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 15m1 stop Istanbul

7:05 pm - 9:55 amSEA Seattle/Tacoma Intl-OPO Porto

30h 50m1 stop Istanbul

$995Turkish Airlines

Fri, Jan 15 - Sun, Jan 17

10:55 am - 5:10 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 15m1 stop Istanbul

7:05 pm - 9:55 amSEA Seattle/Tacoma Intl-OPO Porto

30h 50m1 stop Istanbul

$997Turkish Airlines

Fri, Jan 15 - Sun, Jan 17

4:25 pm - 11:07 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 42m2 stops Istanbul Chicago O'Hare Intl

7:05 pm - 9:55 amSEA Seattle/Tacoma Intl-OPO Porto

30h 50m1 stop Istanbul

$1,006Turkish Airlines

Mon, Nov 16 - Thu, Nov 19

8:20 am - 9:27 amOPO Porto-SEA Seattle/Tacoma Intl

33h 07m2 stops Madrid Barajas Chicago O'Hare Intl

11:55 pm - 4:00 pmSEA Seattle/Tacoma Intl-OPO Porto

32h 05m2 stops Chicago O'Hare Intl Madrid Barajas

$1,052American Airlines

Fri, Jan 15 - Sun, Jan 17

6:00 am - 6:22 pmOPO Porto-SEA Seattle/Tacoma Intl

20h 22m2 stops Frankfurt am Main Vancouver Intl

3:15 pm - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

40h 10m2 stops Vancouver Intl Frankfurt am Main

$1,072Air Canada

Fri, Jan 15 - Sun, Jan 17

8:20 am - 9:27 amOPO Porto-SEA Seattle/Tacoma Intl

33h 07m2 stops Madrid Barajas Chicago O'Hare Intl

11:55 pm - 4:00 pmSEA Seattle/Tacoma Intl-OPO Porto

32h 05m2 stops Chicago O'Hare Intl Madrid Barajas

$1,097American Airlines

Fri, Jan 15 - Sun, Jan 17

8:20 am - 8:13 pmOPO Porto-SEA Seattle/Tacoma Intl

19h 53m2 stops Madrid Barajas Chicago O'Hare Intl

10:17 am - 11:45 amSEA Seattle/Tacoma Intl-OPO Porto

17h 28m2 stops Chicago O'Hare Intl Madrid Barajas

$1,098American Airlines

Fri, Jan 15 - Sun, Jan 17

8:20 am - 9:27 amOPO Porto-SEA Seattle/Tacoma Intl

33h 07m2 stops Madrid Barajas Chicago O'Hare Intl

11:55 pm - 4:00 pmSEA Seattle/Tacoma Intl-OPO Porto

32h 05m2 stops Chicago O'Hare Intl Madrid Barajas

$1,099American Airlines

Fri, Jan 15 - Sun, Jan 17

Cheap last minute flights

Enter your travel dates to find the best prices.

4:25 pm - 11:20 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 55m2 stops Istanbul Chicago O'Hare Intl

7:05 pm - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

36h 20m1 stop Istanbul

$926Turkish Airlines

Thu, Nov 5 - Mon, Nov 9

4:25 pm - 11:20 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 55m2 stops Istanbul Chicago O'Hare Intl

7:05 pm - 9:55 amSEA Seattle/Tacoma Intl-OPO Porto

30h 50m1 stop Istanbul

$928Turkish Airlines

Thu, Nov 5 - Mon, Nov 9

4:25 pm - 11:20 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 55m2 stops Istanbul Chicago O'Hare Intl

7:05 pm - 9:55 amSEA Seattle/Tacoma Intl-OPO Porto

30h 50m1 stop Istanbul

$929Turkish Airlines

Thu, Nov 5 - Mon, Nov 9

10:55 am - 5:10 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 15m1 stop Istanbul

7:05 pm - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

36h 20m1 stop Istanbul

$945Turkish Airlines

Thu, Nov 5 - Mon, Nov 9

5:00 am - 4:24 pmOPO Porto-SEA Seattle/Tacoma Intl

19h 24m2 stops Amsterdam Schiphol Salt Lake City

6:00 am - 10:35 amSEA Seattle/Tacoma Intl-OPO Porto

20h 35m2 stops Minneapolis St Paul Paris Charles de Gaulle

$1,146Delta

Thu, Nov 5 - Mon, Nov 9

5:55 am - 3:55 pmOPO Porto-SEA Seattle/Tacoma Intl

18h 00m2 stops Paris Charles de Gaulle Frankfurt am Main

5:50 pm - 10:30 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 40m3 stops Frankfurt am Main Paris Charles de Gaulle Amsterdam Schiphol

$1,172Multiple Airlines

Thu, Nov 5 - Mon, Nov 9

4:25 pm - 3:32 pmOPO Porto-SEA Seattle/Tacoma Intl

31h 07m2 stops Istanbul Chicago O'Hare Intl

1:16 pm - 9:55 amSEA Seattle/Tacoma Intl-OPO Porto

36h 39m2 stops San Francisco Istanbul

$1,180Multiple Airlines

Thu, Nov 5 - Mon, Nov 9

8:40 pm - 8:20 pmOPO Porto-SEA Seattle/Tacoma Intl

31h 40m2 stops Madrid Barajas Chicago O'Hare Intl

10:43 am - 11:45 amSEA Seattle/Tacoma Intl-OPO Porto

17h 02m2 stops Chicago O'Hare Intl Madrid Barajas

$1,207Multiple Airlines

Thu, Nov 5 - Mon, Nov 9

12:35 pm - 9:39 pmOPO Porto-SEA Seattle/Tacoma Intl

17h 04m1 stop Newark

6:30 am - 9:30 amSEA Seattle/Tacoma Intl-OPO Porto

19h 00m1 stop Newark

$1,213United Airlines

Thu, Nov 5 - Mon, Nov 9

12:35 pm - 9:39 pmOPO Porto-SEA Seattle/Tacoma Intl

17h 04m1 stop Newark

6:30 am - 9:30 amSEA Seattle/Tacoma Intl-OPO Porto

19h 00m1 stop Newark

$1,214United Airlines

Thu, Nov 5 - Mon, Nov 9

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Air Canada flights from Porto to Seattle

Our best Air Canada deals on Porto to Seattle flight tickets

Air Canada

Jan 15

OPO6:00 amPorto

20h 22m

2 stops

SEA6:22 pmSeattle/Tacoma Intl

Jan 17

SEA3:15 pmSeattle/Tacoma Intl

40h 10m

2 stops

OPO3:25 pmPorto

$1,043

Air Canada

Jan 15

OPO6:00 amPorto

20h 22m

2 stops

SEA6:22 pmSeattle/Tacoma Intl

Jan 17

SEA3:15 pmSeattle/Tacoma Intl

40h 10m

2 stops

OPO3:25 pmPorto

$1,072

Air Canada

Nov 5

OPO8:30 amPorto

21h 27m

3 stops

SEA9:57 pmSeattle/Tacoma Intl

Nov 9

SEA7:45 amSeattle/Tacoma Intl

21h 45m

2 stops

OPO1:30 pmPorto

$7,337

Turkish Airlines flights from Porto to Seattle

Our best Turkish Airlines deals on Porto to Seattle flight tickets

Turkish Airlines

Nov 5

OPO4:25 pmPorto

38h 55m

2 stops

SEA11:20 pmSeattle/Tacoma Intl

Nov 9

SEA7:05 pmSeattle/Tacoma Intl

36h 20m

1 stop

OPO3:25 pmPorto

$926

Turkish Airlines

Nov 5

OPO4:25 pmPorto

38h 55m

2 stops

SEA11:20 pmSeattle/Tacoma Intl

Nov 9

SEA7:05 pmSeattle/Tacoma Intl

30h 50m

1 stop

OPO9:55 amPorto

$928

Turkish Airlines

Nov 5

OPO4:25 pmPorto

38h 55m

2 stops

SEA11:20 pmSeattle/Tacoma Intl

Nov 9

SEA7:05 pmSeattle/Tacoma Intl

30h 50m

1 stop

OPO9:55 amPorto

$929

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Fri 1/15

10:55 am-5:10 pm

1 stop38h 15m

Seattle/Tacoma Intl

Sun 1/17

7:05 pm-9:55 am

1 stop30h 50m

$993

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Fri 1/15

10:55 am-5:10 pm

1 stop38h 15m

Seattle/Tacoma Intl

Sun 1/17

7:05 pm-9:55 am

1 stop30h 50m

$994

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Fri 1/15

10:55 am-5:10 pm

1 stop38h 15m

Seattle/Tacoma Intl

Sun 1/17

7:05 pm-9:55 am

1 stop30h 50m

$995

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Fri 1/15

10:55 am-5:10 pm

1 stop38h 15m

Seattle/Tacoma Intl

Sun 1/17

7:05 pm-9:55 am

1 stop30h 50m

$997

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Mon 11/16

4:25 pm-11:07 pm

2 stops38h 42m

Seattle/Tacoma Intl

Thu 11/19

7:05 pm-9:55 am

1 stop30h 50m

$1,006

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Fri 1/15

8:20 am-9:27 am

2 stops33h 07m

Seattle/Tacoma Intl

Sun 1/17

11:55 pm-4:00 pm

2 stops32h 05m

$1,052

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Fri 1/15

6:00 am-6:22 pm

2 stops20h 22m

Seattle/Tacoma Intl

Sun 1/17

3:15 pm-3:25 pm

2 stops40h 10m

$1,072

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Fri 1/15

8:20 am-9:27 am

2 stops33h 07m

Seattle/Tacoma Intl

Sun 1/17

11:55 pm-4:00 pm

2 stops32h 05m

$1,097

Quickest round-trip

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Fri 1/15

8:20 am-8:13 pm

2 stops19h 53m

Seattle/Tacoma Intl

Sun 1/17

10:17 am-11:45 am

2 stops17h 28m

$1,098

PortoSeattle

OPO Porto - SEA Seattle/Tacoma Intl

OPOSEA

Porto

Fri 1/15

8:20 am-9:27 am

2 stops33h 07m

Seattle/Tacoma Intl

Sun 1/17

11:55 pm-4:00 pm

2 stops32h 05m

$1,099

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.

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	$506
Fastest flight time	38h 15m
Direct flights	None

The best one-way flight to Seattle from Porto in the past 72 hours is $506. The best round-trip flight deal from Porto to Seattle found on momondo in the last 72 hours is $993.

The fastest flight from Porto to Seattle takes 38h 15m

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. 38h 15m 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

Kent

Olympia

Federal Way

Redmond

Lakewood

Lynnwood

Fife

Puyallup

Tukwila

Cle Elum

Marysville

Lacey

Kirkland

Centralia

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.