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

American Airlines, British Airways, and United Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Portugal

What airlines fly to Portugal?

British Airways, Delta and United Airlines are the top three most popular airlines that fly to Portugal from Seattle according to our data. British Airways is the first choice among our users, with 31% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 14 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 14 as of May 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.

$338 Cheap Flights from Seattle to Portugal in 2026

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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.

7:40 am - 11:45 am

SEA

OPO

21h 05m

2 stops

9:55 pm - 4:55 pm

OPO

SEA

27h 00m

2 stops

$776Iberia

Tue, Oct 27 - Wed, Nov 4

2:30 pm - 4:05 pm

SEA

LIS

42h 35m

2 stops

4:55 pm - 10:11 pm

LIS

SEA

37h 16m

2 stops

$786Scandinavian Airlines

Mon, Oct 26 - Mon, Nov 9

12:35 pm - 11:35 pm

SEA

LIS

27h 00m

1 stop

5:05 pm - 5:15 pm

LIS

SEA

32h 10m

1 stop

$788Turkish Airlines

Mon, Aug 31 - Tue, Sep 15

6:50 am - 9:30 am

SEA

OPO

19h 40m

1 stop

6:00 am - 10:59 pm

OPO

SEA

24h 59m

2 stops

$812United Airlines

Tue, Oct 27 - Wed, Nov 4

10:30 am - 7:00 am

SEA

OPO

36h 30m

2 stops

6:15 am - 2:20 pm

OPO

SEA

15h 05m

1 stop

$820Lufthansa

Sun, Oct 18 - Fri, Oct 30

8:20 pm - 5:55 pm

SEA

LIS

13h 35m

1 stop

11:05 am - 10:15 pm

LIS

SEA

19h 10m

1 stop

$823British Airways

Tue, Oct 20 - Tue, Nov 10

2:40 pm - 5:30 pm

SEA

LIS

19h 50m

1 stop

5:00 am - 11:47 am

LIS

SEA

14h 47m

1 stop

$825Delta

Tue, Oct 27 - Thu, Nov 12

3:00 pm - 7:00 am

SEA

OPO

32h 00m

2 stops

6:20 am - 4:59 pm

OPO

SEA

18h 39m

1 stop

$829Lufthansa

Mon, Sep 21 - Fri, Oct 2

7:20 am - 11:20 am

SEA

LIS

21h 00m

2 stops

5:00 am - 11:47 am

LIS

SEA

14h 47m

1 stop

$830Delta

Tue, Oct 27 - Thu, Nov 5

7:30 am - 9:55 am

SEA

FAO

18h 25m

1 stop

11:40 am - 11:45 pm

FAO

SEA

20h 05m

1 stop

$979United Airlines

Sun, Sep 13 - Tue, Sep 22

Scandinavian Airlines flights from Seattle to Portugal

Our best Scandinavian Airlines deals on Seattle to Portugal flight tickets

Scandinavian Airlines

Oct 26

SEA2:30 pmSeattle/Tacoma Intl

42h 35m

2 stops

LIS4:05 pmLisbon Humberto Delgado

Nov 10

LIS4:55 pmLisbon Humberto Delgado

37h 16m

2 stops

SEA10:11 pmSeattle/Tacoma Intl

$786

Scandinavian Airlines

Oct 23

SEA7:20 amSeattle/Tacoma Intl

24h 15m

2 stops

LIS3:35 pmLisbon Humberto Delgado

Nov 8

LIS4:55 pmLisbon Humberto Delgado

37h 09m

2 stops

SEA10:04 pmSeattle/Tacoma Intl

$790

Scandinavian Airlines

Oct 27

SEA2:30 pmSeattle/Tacoma Intl

42h 35m

2 stops

LIS4:05 pmLisbon Humberto Delgado

Nov 12

LIS4:55 pmLisbon Humberto Delgado

39h 14m

2 stops

SEA12:09 amSeattle/Tacoma Intl

$820

British Airways flights from Seattle to Portugal

Our best British Airways deals on Seattle to Portugal flight tickets

British Airways

Oct 20

SEA8:20 pmSeattle/Tacoma Intl

13h 35m

1 stop

LIS5:55 pmLisbon Humberto Delgado

Nov 10

LIS11:05 amLisbon Humberto Delgado

19h 10m

1 stop

SEA10:15 pmSeattle/Tacoma Intl

$823

British Airways

Oct 5

SEA1:30 pmSeattle/Tacoma Intl

22h 35m

1 stop

OPO8:05 pmPorto

Oct 19

OPO9:25 pmPorto

22h 10m

1 stop

SEA11:35 amSeattle/Tacoma Intl

$858

British Airways

Oct 13

SEA1:30 pmSeattle/Tacoma Intl

20h 25m

1 stop

LIS5:55 pmLisbon Humberto Delgado

Oct 28

LIS11:05 amLisbon Humberto Delgado

18h 46m

1 stop

SEA10:51 pmSeattle/Tacoma Intl

$869

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 10/27

7:40 am-11:45 am

2 stops21h 05m

Porto

Wed 11/4

9:55 pm-4:55 pm

2 stops27h 00m

$776

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 10/26

2:30 pm-4:05 pm

2 stops42h 35m

Lisbon Humberto Delgado

Mon 11/9

4:55 pm-10:11 pm

2 stops37h 16m

$786

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 8/31

12:35 pm-11:35 pm

1 stop27h 00m

Lisbon Humberto Delgado

Tue 9/15

5:05 pm-5:15 pm

1 stop32h 10m

$788

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 10/27

6:50 am-9:30 am

1 stop19h 40m

Porto

Wed 11/4

6:00 am-10:59 pm

2 stops24h 59m

$812

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 10/18

10:30 am-7:00 am

2 stops36h 30m

Porto

Fri 10/30

6:15 am-2:20 pm

1 stop15h 05m

$820

Quickest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 10/20

8:20 pm-5:55 pm

1 stop13h 35m

Lisbon Humberto Delgado

Tue 11/10

11:05 am-10:15 pm

1 stop19h 10m

$823

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 10/27

2:40 pm-5:30 pm

1 stop19h 50m

Lisbon Humberto Delgado

Thu 11/12

5:00 am-11:47 am

1 stop14h 47m

$825

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 9/21

3:00 pm-7:00 am

2 stops32h 00m

Porto

Fri 10/2

6:20 am-4:59 pm

1 stop18h 39m

$829

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 10/27

7:20 am-11:20 am

2 stops21h 00m

Lisbon Humberto Delgado

Thu 11/5

5:00 am-11:47 am

1 stop14h 47m

$830

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Sun 9/13

7:30 am-9:55 am

1 stop18h 25m

Faro

Tue 9/22

11:40 am-11:45 pm

1 stop20h 05m

$979

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 $339, 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 April instead. Flights to Portugal in April, while not as cheap as those in January, still average around $390.

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 $817 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 $727 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 40% 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

Fastest flight time	13h 35m
Direct flights	None

The fastest flight from Seattle to Portugal takes 13h 35m

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

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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 14 as of May 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 $348	Free Cancellation	Rating 7.0 650 reviews	Search Icelandair flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,511 reviews	Search KLM flights
Lufthansa	PriceFrom $482	Free Cancellation	Rating 6.8 7,972 reviews	Search Lufthansa flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 7,946 reviews	Search British Airways flights
United Airlines	PriceFrom $494	Free Cancellation	Rating 7.4 9,683 reviews	Search United Airlines flights
Air France	PriceFrom $505	Free Cancellation	Rating 7.4 1,585 reviews	Search Air France flights
Air Canada	PriceFrom $543	Free Cancellation	Rating 7.1 10,998 reviews	Search Air Canada flights
Delta	PriceFrom $545	Free Cancellation	Rating 7.9 8,459 reviews	Search Delta flights
Aer Lingus	PriceFrom $553	Free Cancellation	Rating 7.3 1,541 reviews	Search Aer Lingus flights
American Airlines	PriceFrom $558	Free Cancellation	Rating 7.1 11,669 reviews	Search American Airlines 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.

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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 $434

Flights to Portofrom $426

Flights to Funchalfrom $578

Flights to Farofrom $636

Flights to Ponta Delgadafrom $630

Flights to Lajesfrom $694

Flights to Pico Islandfrom $786

Flights to Hortafrom $779

Flights to Porto Santofrom $845

Flights to Velasfrom $769

Cheap flights from Seattle to Portugal from $338

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 5/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Big names and deals

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Filter for what you want

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Find the cheapest flights from Seattle to Portugal

Cheap round-trip flights

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Scandinavian Airlines flights from Seattle to Portugal

Our best Scandinavian Airlines deals on Seattle to Portugal flight tickets

British Airways flights from Seattle to Portugal

Our best British Airways deals on Seattle to Portugal flight tickets

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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

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

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