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

Lufthansa, Delta, and Icelandair are the most popular carriers operating from Seattle/Tacoma Intl to Portugal

What airlines fly to Portugal?

Delta, British Airways and United Airlines are the top three most popular airlines that fly to Portugal from Seattle according to our data. Delta is the first choice among our users, with 37% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 12 different airlines that fly to Portugal on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Portugal?

Prices for flights from Seattle/Tacoma Intl Airport to Portugal were last updated today.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Portugal?

The number of operators available for flights from Seattle/Tacoma Intl Airport to Portugal is 12 as of September 2026.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Portugal?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Portugal.

What documentation or ID do you need to fly to Portugal?

The necessary travel and health documents for your Portugal 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.

$280 Cheap Flights from Seattle to Portugal in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Portugal

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:43 am - 4:50 pmSEA Seattle/Tacoma Intl-OPO Porto

22h 07m2 stops Chicago O'Hare Intl London Heathrow

8:20 am - 12:32 amOPO Porto-SEA Seattle/Tacoma Intl

24h 12m2 stops Madrid Barajas Chicago O'Hare Intl

$603British Airways

Wed, Nov 11 - Thu, Dec 3

7:15 am - 8:15 amSEA Seattle/Tacoma Intl-OPO Porto

17h 00m1 stop New York John F Kennedy Intl

10:15 am - 11:00 pmOPO Porto-SEA Seattle/Tacoma Intl

20h 45m1 stop New York John F Kennedy Intl

$604Delta

Wed, Nov 4 - Thu, Nov 19

7:15 am - 8:15 amSEA Seattle/Tacoma Intl-OPO Porto

17h 00m1 stop New York John F Kennedy Intl

5:00 am - 11:50 amOPO Porto-SEA Seattle/Tacoma Intl

14h 50m1 stop Amsterdam Schiphol

$608Delta

Wed, Nov 18 - Wed, Jan 13

6:00 am - 9:30 amSEA Seattle/Tacoma Intl-OPO Porto

19h 30m2 stops Los Angeles Newark

12:35 pm - 10:27 pmOPO Porto-SEA Seattle/Tacoma Intl

17h 52m1 stop Newark

$609United Airlines

Wed, Nov 11 - Thu, Dec 3

6:45 pm - 8:00 pmSEA Seattle/Tacoma Intl-OPO Porto

17h 15m2 stops London Heathrow Madrid Barajas

12:25 pm - 4:54 pmOPO Porto-SEA Seattle/Tacoma Intl

36h 29m2 stops Madrid Barajas Dallas/Fort Worth

$609Multiple Airlines

Mon, Jan 11 - Mon, Jan 25

6:50 am - 9:30 amSEA Seattle/Tacoma Intl-OPO Porto

19h 40m1 stop Newark

12:35 pm - 9:59 amOPO Porto-SEA Seattle/Tacoma Intl

29h 24m2 stops Newark Denver Intl

$614United Airlines

Tue, Mar 16 - Tue, Mar 30

7:15 am - 8:15 amSEA Seattle/Tacoma Intl-OPO Porto

17h 00m1 stop New York John F Kennedy Intl

5:00 am - 4:53 pmOPO Porto-SEA Seattle/Tacoma Intl

19h 53m2 stops Amsterdam Schiphol Salt Lake City

$619KLM

Wed, Nov 18 - Wed, Jan 13

7:15 am - 8:15 amSEA Seattle/Tacoma Intl-OPO Porto

17h 00m1 stop New York John F Kennedy Intl

5:55 am - 1:50 pmOPO Porto-SEA Seattle/Tacoma Intl

15h 55m1 stop Paris Charles de Gaulle

$629KLM

Wed, Nov 18 - Tue, Jan 12

8:20 pm - 11:10 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

18h 50m1 stop London Heathrow

6:35 pm - 12:25 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

24h 50m1 stop London Heathrow

$658British Airways

Mon, Oct 19 - Mon, Oct 26

6:45 pm - 9:45 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

19h 00m1 stop London Heathrow

6:45 pm - 9:29 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

22h 44m2 stops Madrid Barajas Dallas/Fort Worth

$658Multiple Airlines

Sun, Jan 17 - Sat, Jan 23

Cheap last minute flights

Enter your travel dates to find the best prices.

6:45 pm - 8:50 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

30h 05m1 stop Paris Charles de Gaulle

11:55 am - 11:52 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

31h 57m1 stop Amsterdam Schiphol

$727Delta

Sun, Sep 27 - Wed, Oct 14

6:45 pm - 2:55 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

36h 10m1 stop Paris Charles de Gaulle

11:55 am - 11:52 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

31h 57m1 stop Amsterdam Schiphol

$727Delta

Sun, Sep 27 - Mon, Oct 19

8:20 pm - 3:35 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

35h 15m1 stop London Heathrow

6:55 pm - 11:35 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

24h 40m1 stop London Heathrow

$772British Airways

Mon, Sep 28 - Sat, Oct 17

6:45 pm - 10:25 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

19h 40m1 stop Paris Charles de Gaulle

7:45 pm - 11:52 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

24h 07m1 stop Amsterdam Schiphol

$785Multiple Airlines

Fri, Sep 25 - Mon, Oct 5

1:30 pm - 11:05 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

25h 35m1 stop London Heathrow

6:55 pm - 11:35 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

24h 40m1 stop London Heathrow

$890British Airways

Sun, Sep 27 - Sat, Oct 17

6:45 pm - 10:25 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

19h 40m1 stop Paris Charles de Gaulle

7:45 pm - 11:52 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

24h 07m1 stop Amsterdam Schiphol

$900Multiple Airlines

Sun, Sep 27 - Sat, Oct 3

6:50 pm - 10:45 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

19h 55m1 stop Munich Franz Josef Strauss

2:30 pm - 4:59 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

34h 29m1 stop Munich Franz Josef Strauss

$923Lufthansa

Fri, Sep 25 - Mon, Oct 5

11:59 pm - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

25h 46m2 stops Houston George Bush Intcntl Newark

12:10 pm - 12:20 pmOPO Porto-SEA Seattle/Tacoma Intl

32h 10m1 stop Frankfurt am Main

$927United Airlines

Mon, Sep 28 - Mon, Oct 5

11:13 pm - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

26h 32m2 stops Chicago O'Hare Intl Newark

12:10 pm - 12:20 pmOPO Porto-SEA Seattle/Tacoma Intl

32h 10m1 stop Frankfurt am Main

$927United Airlines

Mon, Sep 28 - Mon, Oct 5

2:10 pm - 3:35 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

17h 25m1 stop Frankfurt am Main

2:30 pm - 4:59 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

34h 29m1 stop Munich Franz Josef Strauss

$1,013Lufthansa

Wed, Sep 23 - Mon, Sep 28

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Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets

Lufthansa

Feb 5

SEA2:50 pmSeattle/Tacoma Intl

24h 50m

1 stop

OPO11:40 pmPorto

Feb 12

OPO6:15 amPorto

14h 45m

1 stop

SEA1:00 pmSeattle/Tacoma Intl

$672

Lufthansa

Jan 11

SEA1:50 pmSeattle/Tacoma Intl

17h 40m

1 stop

OPO3:30 pmPorto

Jan 25

OPO1:45 pmPorto

36h 37m

2 stops

SEA6:22 pmSeattle/Tacoma Intl

$679

Lufthansa

Oct 30

SEA3:50 pmSeattle/Tacoma Intl

24h 45m

1 stop

LIS11:35 pmLisbon Humberto Delgado

Nov 10

LIS2:20 pmLisbon Humberto Delgado

30h 40m

1 stop

SEA1:00 pmSeattle/Tacoma Intl

$695

Iberia flights from Seattle to Portugal

Our best Iberia deals on Seattle to Portugal flight tickets

Iberia

Nov 5

SEA5:10 amSeattle/Tacoma Intl

22h 35m

2 stops

OPO11:45 amPorto

Nov 19

OPO8:20 amPorto

24h 22m

2 stops

SEA12:42 amSeattle/Tacoma Intl

$660

Iberia

Nov 18

SEA10:43 amSeattle/Tacoma Intl

23h 22m

2 stops

LIS6:05 pmLisbon Humberto Delgado

Nov 22

LIS7:45 amLisbon Humberto Delgado

24h 57m

2 stops

SEA12:42 amSeattle/Tacoma Intl

$667

Iberia

Feb 19

SEA6:45 pmSeattle/Tacoma Intl

17h 20m

2 stops

LIS8:05 pmLisbon Humberto Delgado

Feb 28

LIS7:45 amLisbon Humberto Delgado

24h 50m

2 stops

SEA12:35 amSeattle/Tacoma Intl

$700

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 11/11

10:43 am-4:50 pm

2 stops22h 07m

Porto

Thu 12/3

8:20 am-12:32 am

2 stops24h 12m

$603

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 11/4

7:15 am-8:15 am

1 stop17h 00m

Porto

Thu 11/19

10:15 am-11:00 pm

1 stop20h 45m

$604

Quickest round-trip

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 11/18

7:15 am-8:15 am

1 stop17h 00m

Porto

Wed 1/13

5:00 am-11:50 am

1 stop14h 50m

$608

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 11/11

6:00 am-9:30 am

2 stops19h 30m

Porto

Thu 12/3

12:35 pm-10:27 pm

1 stop17h 52m

$609

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 1/11

6:45 pm-8:00 pm

2 stops17h 15m

Porto

Mon 1/25

12:25 pm-4:54 pm

2 stops36h 29m

$609

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 3/16

6:50 am-9:30 am

1 stop19h 40m

Porto

Tue 3/30

12:35 pm-9:59 am

2 stops29h 24m

$614

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 11/18

7:15 am-8:15 am

1 stop17h 00m

Porto

Wed 1/13

5:00 am-4:53 pm

2 stops19h 53m

$619

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 11/18

7:15 am-8:15 am

1 stop17h 00m

Porto

Tue 1/12

5:55 am-1:50 pm

1 stop15h 55m

$629

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Mon 10/19

8:20 pm-11:10 pm

1 stop18h 50m

Lisbon Humberto Delgado

Mon 10/26

6:35 pm-12:25 pm

1 stop24h 50m

$658

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Sun 1/17

6:45 pm-9:45 pm

1 stop19h 00m

Lisbon Humberto Delgado

Sat 1/23

6:45 pm-9:29 am

2 stops22h 44m

$658

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 Seattle to Portugal

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 Portugal?

The cheapest month to fly to Portugal from Seattle is in January. Flight prices, which tend to average around $470, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Portugal from Seattle during February instead. Flights to Portugal in February, while not as cheap as those in January, still average around $580.

How far in advance should I book a flight from Seattle to Portugal?

You are more likely to see cheaper flights to Portugal from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Portugal for around $855 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portugal from Seattle for as low as $787 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 7% on your flight if you consider stops on a Seattle to Portugal flight.

Cheap Seattle to Portugal flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Portugal

Best Price Found	$280
Fastest flight time	14h 10m
Direct flights	None

The best one-way flight to Portugal from Seattle in the past 72 hours is $280. The best round-trip flight deal from Seattle to Portugal found on momondo in the last 72 hours is $603.

The fastest flight from Seattle to Portugal takes 14h 10m

There are no direct flights from Seattle to Portugal. There are no popular flight routes from Seattle to Portugal.

Search flight deals

Frequently asked questions about flying from Seattle to Portugal

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Portugal?
Prices for flights from Seattle/Tacoma Intl Airport to Portugal were last updated today.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Portugal?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Portugal is 12 as of September 2026.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Portugal?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Portugal.
What documentation or ID do you need to fly to Portugal?
The necessary travel and health documents for your Portugal 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.

Best airlines flying from Seattle to Portugal

Compare and see reviews for airlines that fly from Seattle to Portugal with momondo

Airline	Rating	Free Cancellation	Price
Icelandair	PriceFrom $345	Free Cancellation	Rating 6.9 749 reviews	Search Icelandair flights
Lufthansa	PriceFrom $471	Free Cancellation	Rating 6.8 8,238 reviews	Search Lufthansa flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,575 reviews	Search KLM flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 8,229 reviews	Search British Airways flights
United Airlines	PriceFrom $482	Free Cancellation	Rating 7.4 10,230 reviews	Search United Airlines flights
American Airlines	PriceFrom $497	Free Cancellation	Rating 7.0 12,075 reviews	Search American Airlines flights
Air France	PriceFrom $504	Free Cancellation	Rating 7.5 1,651 reviews	Search Air France flights
Delta	PriceFrom $550	Free Cancellation	Rating 7.8 8,594 reviews	Search Delta flights
Scandinavian Airlines	PriceFrom $567	Free Cancellation	Rating 7.4 1,990 reviews	Search Scandinavian Airlines flights
Air Canada	PriceFrom $660	Free Cancellation	Rating 7.1 11,668 reviews	Search Air Canada flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Portugal?

It is quick and easy to find Seattle to Portugal flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Portugal that suits you.

Can I find flights from Seattle to Portugal with flexible booking policies on momondo?

All flight searches from Seattle to Portugal on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Portugal?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Portugal.

I’m not ready to book a flight from Seattle to Portugal right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Portugal, momondo offers a useful price alert feature which will track prices for flights to Portugal from Seattle and alert you when they change.

An easier way to manage your Portugal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

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Find better results for your trip to Portugal

Popular cities

Other flights from Seattle

Other flights to Portugal

Airlines

Cabin classes

Complete your trip

Feeling lucky

Popular cities in Portugal

Flights to Lisbonfrom $454

Flights to Portofrom $470

Flights to Funchalfrom $485

Flights to Farofrom $463

Flights to Ponta Delgadafrom $561

Flights to Lajesfrom $568

Flights to Hortafrom $591

Flights to Pico Islandfrom $592

Flights to Porto Santofrom $999

Flights to Velasfrom $590

Cheap flights from Seattle to Portugal from $280

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Portugal departing on 10/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Seattle to Portugal

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Big names and deals

Big names and deals

Filter for what you want

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Trusted and free

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Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets

Iberia flights from Seattle to Portugal

Our best Iberia deals on Seattle to Portugal flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to Portugal that are best for you.

See travel insights to Portugal from

How to get the cheapest flight ticket from Seattle to Portugal

What is the cheapest month to fly to Portugal?

How far in advance should I book a flight from Seattle to Portugal?

Can stopping save me money on Seattle to Portugal flights?

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

What airlines fly to Portugal?

Cheap Seattle to Portugal flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Seattle to Portugal

Best airlines flying from Seattle to Portugal

Compare and see reviews for airlines that fly from Seattle to Portugal with momondo

Why use momondo?

An easier way to manage your Portugal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Portugal

Popular cities in Portugal

Popular flights according to clicks in the last 7 days on momondo

Seattle flight routes

According to popular flight searches on momondo this year

Portugal flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Portugal

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Portugal

List of cabin classes available on flights landing in Portugal. Availability may vary depending on flight origin and airline.

Complete your trip to Portugal

Explore popular destinations other users love

According to popular flight searches on momondo this year